0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8(10) to 64 bit double precision IEEE 754 binary floating point representation standard (1 bit for sign, 11 bits for exponent, 52 bits for mantissa)

What are the steps to convert decimal number
0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8(10) to 64 bit double precision IEEE 754 binary floating point representation (1 bit for sign, 11 bits for exponent, 52 bits for mantissa)

1. First, convert to binary (in base 2) the integer part: 0.
Divide the number repeatedly by 2.

Keep track of each remainder.

We stop when we get a quotient that is equal to zero.


  • division = quotient + remainder;
  • 0 ÷ 2 = 0 + 0;

2. Construct the base 2 representation of the integer part of the number.

Take all the remainders starting from the bottom of the list constructed above.

0(10) =

0(2)


3. Convert to binary (base 2) the fractional part: 0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8.

Multiply it repeatedly by 2.

Keep track of each integer part of the results.

Stop when we get a fractional part that is equal to zero.


  • #) multiplying = integer + fractional part;
  • 1) 0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8 × 2 = 0 + 0.000 000 000 007 269 999 999 999 999 516 522 114 064 601 356 670 306 011 6;
  • 2) 0.000 000 000 007 269 999 999 999 999 516 522 114 064 601 356 670 306 011 6 × 2 = 0 + 0.000 000 000 014 539 999 999 999 999 033 044 228 129 202 713 340 612 023 2;
  • 3) 0.000 000 000 014 539 999 999 999 999 033 044 228 129 202 713 340 612 023 2 × 2 = 0 + 0.000 000 000 029 079 999 999 999 998 066 088 456 258 405 426 681 224 046 4;
  • 4) 0.000 000 000 029 079 999 999 999 998 066 088 456 258 405 426 681 224 046 4 × 2 = 0 + 0.000 000 000 058 159 999 999 999 996 132 176 912 516 810 853 362 448 092 8;
  • 5) 0.000 000 000 058 159 999 999 999 996 132 176 912 516 810 853 362 448 092 8 × 2 = 0 + 0.000 000 000 116 319 999 999 999 992 264 353 825 033 621 706 724 896 185 6;
  • 6) 0.000 000 000 116 319 999 999 999 992 264 353 825 033 621 706 724 896 185 6 × 2 = 0 + 0.000 000 000 232 639 999 999 999 984 528 707 650 067 243 413 449 792 371 2;
  • 7) 0.000 000 000 232 639 999 999 999 984 528 707 650 067 243 413 449 792 371 2 × 2 = 0 + 0.000 000 000 465 279 999 999 999 969 057 415 300 134 486 826 899 584 742 4;
  • 8) 0.000 000 000 465 279 999 999 999 969 057 415 300 134 486 826 899 584 742 4 × 2 = 0 + 0.000 000 000 930 559 999 999 999 938 114 830 600 268 973 653 799 169 484 8;
  • 9) 0.000 000 000 930 559 999 999 999 938 114 830 600 268 973 653 799 169 484 8 × 2 = 0 + 0.000 000 001 861 119 999 999 999 876 229 661 200 537 947 307 598 338 969 6;
  • 10) 0.000 000 001 861 119 999 999 999 876 229 661 200 537 947 307 598 338 969 6 × 2 = 0 + 0.000 000 003 722 239 999 999 999 752 459 322 401 075 894 615 196 677 939 2;
  • 11) 0.000 000 003 722 239 999 999 999 752 459 322 401 075 894 615 196 677 939 2 × 2 = 0 + 0.000 000 007 444 479 999 999 999 504 918 644 802 151 789 230 393 355 878 4;
  • 12) 0.000 000 007 444 479 999 999 999 504 918 644 802 151 789 230 393 355 878 4 × 2 = 0 + 0.000 000 014 888 959 999 999 999 009 837 289 604 303 578 460 786 711 756 8;
  • 13) 0.000 000 014 888 959 999 999 999 009 837 289 604 303 578 460 786 711 756 8 × 2 = 0 + 0.000 000 029 777 919 999 999 998 019 674 579 208 607 156 921 573 423 513 6;
  • 14) 0.000 000 029 777 919 999 999 998 019 674 579 208 607 156 921 573 423 513 6 × 2 = 0 + 0.000 000 059 555 839 999 999 996 039 349 158 417 214 313 843 146 847 027 2;
  • 15) 0.000 000 059 555 839 999 999 996 039 349 158 417 214 313 843 146 847 027 2 × 2 = 0 + 0.000 000 119 111 679 999 999 992 078 698 316 834 428 627 686 293 694 054 4;
  • 16) 0.000 000 119 111 679 999 999 992 078 698 316 834 428 627 686 293 694 054 4 × 2 = 0 + 0.000 000 238 223 359 999 999 984 157 396 633 668 857 255 372 587 388 108 8;
  • 17) 0.000 000 238 223 359 999 999 984 157 396 633 668 857 255 372 587 388 108 8 × 2 = 0 + 0.000 000 476 446 719 999 999 968 314 793 267 337 714 510 745 174 776 217 6;
  • 18) 0.000 000 476 446 719 999 999 968 314 793 267 337 714 510 745 174 776 217 6 × 2 = 0 + 0.000 000 952 893 439 999 999 936 629 586 534 675 429 021 490 349 552 435 2;
  • 19) 0.000 000 952 893 439 999 999 936 629 586 534 675 429 021 490 349 552 435 2 × 2 = 0 + 0.000 001 905 786 879 999 999 873 259 173 069 350 858 042 980 699 104 870 4;
  • 20) 0.000 001 905 786 879 999 999 873 259 173 069 350 858 042 980 699 104 870 4 × 2 = 0 + 0.000 003 811 573 759 999 999 746 518 346 138 701 716 085 961 398 209 740 8;
  • 21) 0.000 003 811 573 759 999 999 746 518 346 138 701 716 085 961 398 209 740 8 × 2 = 0 + 0.000 007 623 147 519 999 999 493 036 692 277 403 432 171 922 796 419 481 6;
  • 22) 0.000 007 623 147 519 999 999 493 036 692 277 403 432 171 922 796 419 481 6 × 2 = 0 + 0.000 015 246 295 039 999 998 986 073 384 554 806 864 343 845 592 838 963 2;
  • 23) 0.000 015 246 295 039 999 998 986 073 384 554 806 864 343 845 592 838 963 2 × 2 = 0 + 0.000 030 492 590 079 999 997 972 146 769 109 613 728 687 691 185 677 926 4;
  • 24) 0.000 030 492 590 079 999 997 972 146 769 109 613 728 687 691 185 677 926 4 × 2 = 0 + 0.000 060 985 180 159 999 995 944 293 538 219 227 457 375 382 371 355 852 8;
  • 25) 0.000 060 985 180 159 999 995 944 293 538 219 227 457 375 382 371 355 852 8 × 2 = 0 + 0.000 121 970 360 319 999 991 888 587 076 438 454 914 750 764 742 711 705 6;
  • 26) 0.000 121 970 360 319 999 991 888 587 076 438 454 914 750 764 742 711 705 6 × 2 = 0 + 0.000 243 940 720 639 999 983 777 174 152 876 909 829 501 529 485 423 411 2;
  • 27) 0.000 243 940 720 639 999 983 777 174 152 876 909 829 501 529 485 423 411 2 × 2 = 0 + 0.000 487 881 441 279 999 967 554 348 305 753 819 659 003 058 970 846 822 4;
  • 28) 0.000 487 881 441 279 999 967 554 348 305 753 819 659 003 058 970 846 822 4 × 2 = 0 + 0.000 975 762 882 559 999 935 108 696 611 507 639 318 006 117 941 693 644 8;
  • 29) 0.000 975 762 882 559 999 935 108 696 611 507 639 318 006 117 941 693 644 8 × 2 = 0 + 0.001 951 525 765 119 999 870 217 393 223 015 278 636 012 235 883 387 289 6;
  • 30) 0.001 951 525 765 119 999 870 217 393 223 015 278 636 012 235 883 387 289 6 × 2 = 0 + 0.003 903 051 530 239 999 740 434 786 446 030 557 272 024 471 766 774 579 2;
  • 31) 0.003 903 051 530 239 999 740 434 786 446 030 557 272 024 471 766 774 579 2 × 2 = 0 + 0.007 806 103 060 479 999 480 869 572 892 061 114 544 048 943 533 549 158 4;
  • 32) 0.007 806 103 060 479 999 480 869 572 892 061 114 544 048 943 533 549 158 4 × 2 = 0 + 0.015 612 206 120 959 998 961 739 145 784 122 229 088 097 887 067 098 316 8;
  • 33) 0.015 612 206 120 959 998 961 739 145 784 122 229 088 097 887 067 098 316 8 × 2 = 0 + 0.031 224 412 241 919 997 923 478 291 568 244 458 176 195 774 134 196 633 6;
  • 34) 0.031 224 412 241 919 997 923 478 291 568 244 458 176 195 774 134 196 633 6 × 2 = 0 + 0.062 448 824 483 839 995 846 956 583 136 488 916 352 391 548 268 393 267 2;
  • 35) 0.062 448 824 483 839 995 846 956 583 136 488 916 352 391 548 268 393 267 2 × 2 = 0 + 0.124 897 648 967 679 991 693 913 166 272 977 832 704 783 096 536 786 534 4;
  • 36) 0.124 897 648 967 679 991 693 913 166 272 977 832 704 783 096 536 786 534 4 × 2 = 0 + 0.249 795 297 935 359 983 387 826 332 545 955 665 409 566 193 073 573 068 8;
  • 37) 0.249 795 297 935 359 983 387 826 332 545 955 665 409 566 193 073 573 068 8 × 2 = 0 + 0.499 590 595 870 719 966 775 652 665 091 911 330 819 132 386 147 146 137 6;
  • 38) 0.499 590 595 870 719 966 775 652 665 091 911 330 819 132 386 147 146 137 6 × 2 = 0 + 0.999 181 191 741 439 933 551 305 330 183 822 661 638 264 772 294 292 275 2;
  • 39) 0.999 181 191 741 439 933 551 305 330 183 822 661 638 264 772 294 292 275 2 × 2 = 1 + 0.998 362 383 482 879 867 102 610 660 367 645 323 276 529 544 588 584 550 4;
  • 40) 0.998 362 383 482 879 867 102 610 660 367 645 323 276 529 544 588 584 550 4 × 2 = 1 + 0.996 724 766 965 759 734 205 221 320 735 290 646 553 059 089 177 169 100 8;
  • 41) 0.996 724 766 965 759 734 205 221 320 735 290 646 553 059 089 177 169 100 8 × 2 = 1 + 0.993 449 533 931 519 468 410 442 641 470 581 293 106 118 178 354 338 201 6;
  • 42) 0.993 449 533 931 519 468 410 442 641 470 581 293 106 118 178 354 338 201 6 × 2 = 1 + 0.986 899 067 863 038 936 820 885 282 941 162 586 212 236 356 708 676 403 2;
  • 43) 0.986 899 067 863 038 936 820 885 282 941 162 586 212 236 356 708 676 403 2 × 2 = 1 + 0.973 798 135 726 077 873 641 770 565 882 325 172 424 472 713 417 352 806 4;
  • 44) 0.973 798 135 726 077 873 641 770 565 882 325 172 424 472 713 417 352 806 4 × 2 = 1 + 0.947 596 271 452 155 747 283 541 131 764 650 344 848 945 426 834 705 612 8;
  • 45) 0.947 596 271 452 155 747 283 541 131 764 650 344 848 945 426 834 705 612 8 × 2 = 1 + 0.895 192 542 904 311 494 567 082 263 529 300 689 697 890 853 669 411 225 6;
  • 46) 0.895 192 542 904 311 494 567 082 263 529 300 689 697 890 853 669 411 225 6 × 2 = 1 + 0.790 385 085 808 622 989 134 164 527 058 601 379 395 781 707 338 822 451 2;
  • 47) 0.790 385 085 808 622 989 134 164 527 058 601 379 395 781 707 338 822 451 2 × 2 = 1 + 0.580 770 171 617 245 978 268 329 054 117 202 758 791 563 414 677 644 902 4;
  • 48) 0.580 770 171 617 245 978 268 329 054 117 202 758 791 563 414 677 644 902 4 × 2 = 1 + 0.161 540 343 234 491 956 536 658 108 234 405 517 583 126 829 355 289 804 8;
  • 49) 0.161 540 343 234 491 956 536 658 108 234 405 517 583 126 829 355 289 804 8 × 2 = 0 + 0.323 080 686 468 983 913 073 316 216 468 811 035 166 253 658 710 579 609 6;
  • 50) 0.323 080 686 468 983 913 073 316 216 468 811 035 166 253 658 710 579 609 6 × 2 = 0 + 0.646 161 372 937 967 826 146 632 432 937 622 070 332 507 317 421 159 219 2;
  • 51) 0.646 161 372 937 967 826 146 632 432 937 622 070 332 507 317 421 159 219 2 × 2 = 1 + 0.292 322 745 875 935 652 293 264 865 875 244 140 665 014 634 842 318 438 4;
  • 52) 0.292 322 745 875 935 652 293 264 865 875 244 140 665 014 634 842 318 438 4 × 2 = 0 + 0.584 645 491 751 871 304 586 529 731 750 488 281 330 029 269 684 636 876 8;
  • 53) 0.584 645 491 751 871 304 586 529 731 750 488 281 330 029 269 684 636 876 8 × 2 = 1 + 0.169 290 983 503 742 609 173 059 463 500 976 562 660 058 539 369 273 753 6;
  • 54) 0.169 290 983 503 742 609 173 059 463 500 976 562 660 058 539 369 273 753 6 × 2 = 0 + 0.338 581 967 007 485 218 346 118 927 001 953 125 320 117 078 738 547 507 2;
  • 55) 0.338 581 967 007 485 218 346 118 927 001 953 125 320 117 078 738 547 507 2 × 2 = 0 + 0.677 163 934 014 970 436 692 237 854 003 906 250 640 234 157 477 095 014 4;
  • 56) 0.677 163 934 014 970 436 692 237 854 003 906 250 640 234 157 477 095 014 4 × 2 = 1 + 0.354 327 868 029 940 873 384 475 708 007 812 501 280 468 314 954 190 028 8;
  • 57) 0.354 327 868 029 940 873 384 475 708 007 812 501 280 468 314 954 190 028 8 × 2 = 0 + 0.708 655 736 059 881 746 768 951 416 015 625 002 560 936 629 908 380 057 6;
  • 58) 0.708 655 736 059 881 746 768 951 416 015 625 002 560 936 629 908 380 057 6 × 2 = 1 + 0.417 311 472 119 763 493 537 902 832 031 250 005 121 873 259 816 760 115 2;
  • 59) 0.417 311 472 119 763 493 537 902 832 031 250 005 121 873 259 816 760 115 2 × 2 = 0 + 0.834 622 944 239 526 987 075 805 664 062 500 010 243 746 519 633 520 230 4;
  • 60) 0.834 622 944 239 526 987 075 805 664 062 500 010 243 746 519 633 520 230 4 × 2 = 1 + 0.669 245 888 479 053 974 151 611 328 125 000 020 487 493 039 267 040 460 8;
  • 61) 0.669 245 888 479 053 974 151 611 328 125 000 020 487 493 039 267 040 460 8 × 2 = 1 + 0.338 491 776 958 107 948 303 222 656 250 000 040 974 986 078 534 080 921 6;
  • 62) 0.338 491 776 958 107 948 303 222 656 250 000 040 974 986 078 534 080 921 6 × 2 = 0 + 0.676 983 553 916 215 896 606 445 312 500 000 081 949 972 157 068 161 843 2;
  • 63) 0.676 983 553 916 215 896 606 445 312 500 000 081 949 972 157 068 161 843 2 × 2 = 1 + 0.353 967 107 832 431 793 212 890 625 000 000 163 899 944 314 136 323 686 4;
  • 64) 0.353 967 107 832 431 793 212 890 625 000 000 163 899 944 314 136 323 686 4 × 2 = 0 + 0.707 934 215 664 863 586 425 781 250 000 000 327 799 888 628 272 647 372 8;
  • 65) 0.707 934 215 664 863 586 425 781 250 000 000 327 799 888 628 272 647 372 8 × 2 = 1 + 0.415 868 431 329 727 172 851 562 500 000 000 655 599 777 256 545 294 745 6;
  • 66) 0.415 868 431 329 727 172 851 562 500 000 000 655 599 777 256 545 294 745 6 × 2 = 0 + 0.831 736 862 659 454 345 703 125 000 000 001 311 199 554 513 090 589 491 2;
  • 67) 0.831 736 862 659 454 345 703 125 000 000 001 311 199 554 513 090 589 491 2 × 2 = 1 + 0.663 473 725 318 908 691 406 250 000 000 002 622 399 109 026 181 178 982 4;
  • 68) 0.663 473 725 318 908 691 406 250 000 000 002 622 399 109 026 181 178 982 4 × 2 = 1 + 0.326 947 450 637 817 382 812 500 000 000 005 244 798 218 052 362 357 964 8;
  • 69) 0.326 947 450 637 817 382 812 500 000 000 005 244 798 218 052 362 357 964 8 × 2 = 0 + 0.653 894 901 275 634 765 625 000 000 000 010 489 596 436 104 724 715 929 6;
  • 70) 0.653 894 901 275 634 765 625 000 000 000 010 489 596 436 104 724 715 929 6 × 2 = 1 + 0.307 789 802 551 269 531 250 000 000 000 020 979 192 872 209 449 431 859 2;
  • 71) 0.307 789 802 551 269 531 250 000 000 000 020 979 192 872 209 449 431 859 2 × 2 = 0 + 0.615 579 605 102 539 062 500 000 000 000 041 958 385 744 418 898 863 718 4;
  • 72) 0.615 579 605 102 539 062 500 000 000 000 041 958 385 744 418 898 863 718 4 × 2 = 1 + 0.231 159 210 205 078 125 000 000 000 000 083 916 771 488 837 797 727 436 8;
  • 73) 0.231 159 210 205 078 125 000 000 000 000 083 916 771 488 837 797 727 436 8 × 2 = 0 + 0.462 318 420 410 156 250 000 000 000 000 167 833 542 977 675 595 454 873 6;
  • 74) 0.462 318 420 410 156 250 000 000 000 000 167 833 542 977 675 595 454 873 6 × 2 = 0 + 0.924 636 840 820 312 500 000 000 000 000 335 667 085 955 351 190 909 747 2;
  • 75) 0.924 636 840 820 312 500 000 000 000 000 335 667 085 955 351 190 909 747 2 × 2 = 1 + 0.849 273 681 640 625 000 000 000 000 000 671 334 171 910 702 381 819 494 4;
  • 76) 0.849 273 681 640 625 000 000 000 000 000 671 334 171 910 702 381 819 494 4 × 2 = 1 + 0.698 547 363 281 250 000 000 000 000 001 342 668 343 821 404 763 638 988 8;
  • 77) 0.698 547 363 281 250 000 000 000 000 001 342 668 343 821 404 763 638 988 8 × 2 = 1 + 0.397 094 726 562 500 000 000 000 000 002 685 336 687 642 809 527 277 977 6;
  • 78) 0.397 094 726 562 500 000 000 000 000 002 685 336 687 642 809 527 277 977 6 × 2 = 0 + 0.794 189 453 125 000 000 000 000 000 005 370 673 375 285 619 054 555 955 2;
  • 79) 0.794 189 453 125 000 000 000 000 000 005 370 673 375 285 619 054 555 955 2 × 2 = 1 + 0.588 378 906 250 000 000 000 000 000 010 741 346 750 571 238 109 111 910 4;
  • 80) 0.588 378 906 250 000 000 000 000 000 010 741 346 750 571 238 109 111 910 4 × 2 = 1 + 0.176 757 812 500 000 000 000 000 000 021 482 693 501 142 476 218 223 820 8;
  • 81) 0.176 757 812 500 000 000 000 000 000 021 482 693 501 142 476 218 223 820 8 × 2 = 0 + 0.353 515 625 000 000 000 000 000 000 042 965 387 002 284 952 436 447 641 6;
  • 82) 0.353 515 625 000 000 000 000 000 000 042 965 387 002 284 952 436 447 641 6 × 2 = 0 + 0.707 031 250 000 000 000 000 000 000 085 930 774 004 569 904 872 895 283 2;
  • 83) 0.707 031 250 000 000 000 000 000 000 085 930 774 004 569 904 872 895 283 2 × 2 = 1 + 0.414 062 500 000 000 000 000 000 000 171 861 548 009 139 809 745 790 566 4;
  • 84) 0.414 062 500 000 000 000 000 000 000 171 861 548 009 139 809 745 790 566 4 × 2 = 0 + 0.828 125 000 000 000 000 000 000 000 343 723 096 018 279 619 491 581 132 8;
  • 85) 0.828 125 000 000 000 000 000 000 000 343 723 096 018 279 619 491 581 132 8 × 2 = 1 + 0.656 250 000 000 000 000 000 000 000 687 446 192 036 559 238 983 162 265 6;
  • 86) 0.656 250 000 000 000 000 000 000 000 687 446 192 036 559 238 983 162 265 6 × 2 = 1 + 0.312 500 000 000 000 000 000 000 001 374 892 384 073 118 477 966 324 531 2;
  • 87) 0.312 500 000 000 000 000 000 000 001 374 892 384 073 118 477 966 324 531 2 × 2 = 0 + 0.625 000 000 000 000 000 000 000 002 749 784 768 146 236 955 932 649 062 4;
  • 88) 0.625 000 000 000 000 000 000 000 002 749 784 768 146 236 955 932 649 062 4 × 2 = 1 + 0.250 000 000 000 000 000 000 000 005 499 569 536 292 473 911 865 298 124 8;
  • 89) 0.250 000 000 000 000 000 000 000 005 499 569 536 292 473 911 865 298 124 8 × 2 = 0 + 0.500 000 000 000 000 000 000 000 010 999 139 072 584 947 823 730 596 249 6;
  • 90) 0.500 000 000 000 000 000 000 000 010 999 139 072 584 947 823 730 596 249 6 × 2 = 1 + 0.000 000 000 000 000 000 000 000 021 998 278 145 169 895 647 461 192 499 2;
  • 91) 0.000 000 000 000 000 000 000 000 021 998 278 145 169 895 647 461 192 499 2 × 2 = 0 + 0.000 000 000 000 000 000 000 000 043 996 556 290 339 791 294 922 384 998 4;

We didn't get any fractional part that was equal to zero. But we had enough iterations (over Mantissa limit) and at least one integer that was different from zero => FULL STOP (Losing precision - the converted number we get in the end will be just a very good approximation of the initial one).


4. Construct the base 2 representation of the fractional part of the number.

Take all the integer parts of the multiplying operations, starting from the top of the constructed list above:


0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8(10) =

0.0000 0000 0000 0000 0000 0000 0000 0000 0000 0011 1111 1111 0010 1001 0101 1010 1011 0101 0011 1011 0010 1101 010(2)

5. Positive number before normalization:

0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8(10) =

0.0000 0000 0000 0000 0000 0000 0000 0000 0000 0011 1111 1111 0010 1001 0101 1010 1011 0101 0011 1011 0010 1101 010(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 39 positions to the right, so that only one non zero digit remains to the left of it:


0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8(10) =

0.0000 0000 0000 0000 0000 0000 0000 0000 0000 0011 1111 1111 0010 1001 0101 1010 1011 0101 0011 1011 0010 1101 010(2) =

0.0000 0000 0000 0000 0000 0000 0000 0000 0000 0011 1111 1111 0010 1001 0101 1010 1011 0101 0011 1011 0010 1101 010(2) × 20 =

1.1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010(2) × 2-39


7. Up to this moment, there are the following elements that would feed into the 64 bit double precision IEEE 754 binary floating point representation:

Sign 0 (a positive number)

Exponent (unadjusted): -39

Mantissa (not normalized):
1.1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

Exponent (unadjusted) + 2(11-1) - 1 =

-39 + 2(11-1) - 1 =

(-39 + 1 023)(10) =

984(10)


9. Convert the adjusted exponent from the decimal (base 10) to 11 bit binary.

Use the same technique of repeatedly dividing by 2:


  • division = quotient + remainder;
  • 984 ÷ 2 = 492 + 0;
  • 492 ÷ 2 = 246 + 0;
  • 246 ÷ 2 = 123 + 0;
  • 123 ÷ 2 = 61 + 1;
  • 61 ÷ 2 = 30 + 1;
  • 30 ÷ 2 = 15 + 0;
  • 15 ÷ 2 = 7 + 1;
  • 7 ÷ 2 = 3 + 1;
  • 3 ÷ 2 = 1 + 1;
  • 1 ÷ 2 = 0 + 1;

10. Construct the base 2 representation of the adjusted exponent.

Take all the remainders starting from the bottom of the list constructed above.


Exponent (adjusted) =

984(10) =

011 1101 1000(2)


11. Normalize the mantissa.

a) Remove the leading (the leftmost) bit, since it's allways 1, and the decimal point, if the case.

b) Adjust its length to 52 bits, only if necessary (not the case here).


Mantissa (normalized) =

1. 1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010 =

1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010


12. The three elements that make up the number's 64 bit double precision IEEE 754 binary floating point representation:

Sign (1 bit) =
0 (a positive number)

Exponent (11 bits) =
011 1101 1000

Mantissa (52 bits) =
1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010


Decimal number 0.000 000 000 003 634 999 999 999 999 758 261 057 032 300 678 335 153 005 8 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 011 1101 1000 - 1111 1111 1001 0100 1010 1101 0101 1010 1001 1101 1001 0110 1010

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How to convert numbers from the decimal system (base ten) to 64 bit double precision IEEE 754 binary floating point standard

Follow the steps below to convert a base 10 decimal number to 64 bit double precision IEEE 754 binary floating point:

  • 1. If the number to be converted is negative, start with its the positive version.
  • 2. First convert the integer part. Divide repeatedly by 2 the positive representation of the integer number that is to be converted to binary, until we get a quotient that is equal to zero, keeping track of each remainder.
  • 3. Construct the base 2 representation of the positive integer part of the number, by taking all the remainders from the previous operations, starting from the bottom of the list constructed above. Thus, the last remainder of the divisions becomes the first symbol (the leftmost) of the base two number, while the first remainder becomes the last symbol (the rightmost).
  • 4. Then convert the fractional part. Multiply the number repeatedly by 2, until we get a fractional part that is equal to zero, keeping track of each integer part of the results.
  • 5. Construct the base 2 representation of the fractional part of the number, by taking all the integer parts of the multiplying operations, starting from the top of the list constructed above (they should appear in the binary representation, from left to right, in the order they have been calculated).
  • 6. Normalize the binary representation of the number, shifting the decimal mark (the decimal point) "n" positions either to the left, or to the right, so that only one non zero digit remains to the left of the decimal mark.
  • 7. Adjust the exponent in 11 bit excess/bias notation and then convert it from decimal (base 10) to 11 bit binary, by using the same technique of repeatedly dividing by 2, as shown above:
    Exponent (adjusted) = Exponent (unadjusted) + 2(11-1) - 1
  • 8. Normalize mantissa, remove the leading (leftmost) bit, since it's allways '1' (and the decimal mark, if the case) and adjust its length to 52 bits, either by removing the excess bits from the right (losing precision...) or by adding extra bits set on '0' to the right.
  • 9. Sign (it takes 1 bit) is either 1 for a negative or 0 for a positive number.

Example: convert the negative number -31.640 215 from the decimal system (base ten) to 64 bit double precision IEEE 754 binary floating point:

  • 1. Start with the positive version of the number:

    |-31.640 215| = 31.640 215

  • 2. First convert the integer part, 31. Divide it repeatedly by 2, keeping track of each remainder, until we get a quotient that is equal to zero:
    • division = quotient + remainder;
    • 31 ÷ 2 = 15 + 1;
    • 15 ÷ 2 = 7 + 1;
    • 7 ÷ 2 = 3 + 1;
    • 3 ÷ 2 = 1 + 1;
    • 1 ÷ 2 = 0 + 1;
    • We have encountered a quotient that is ZERO => FULL STOP
  • 3. Construct the base 2 representation of the integer part of the number by taking all the remainders of the previous dividing operations, starting from the bottom of the list constructed above:

    31(10) = 1 1111(2)

  • 4. Then, convert the fractional part, 0.640 215. Multiply repeatedly by 2, keeping track of each integer part of the results, until we get a fractional part that is equal to zero:
    • #) multiplying = integer + fractional part;
    • 1) 0.640 215 × 2 = 1 + 0.280 43;
    • 2) 0.280 43 × 2 = 0 + 0.560 86;
    • 3) 0.560 86 × 2 = 1 + 0.121 72;
    • 4) 0.121 72 × 2 = 0 + 0.243 44;
    • 5) 0.243 44 × 2 = 0 + 0.486 88;
    • 6) 0.486 88 × 2 = 0 + 0.973 76;
    • 7) 0.973 76 × 2 = 1 + 0.947 52;
    • 8) 0.947 52 × 2 = 1 + 0.895 04;
    • 9) 0.895 04 × 2 = 1 + 0.790 08;
    • 10) 0.790 08 × 2 = 1 + 0.580 16;
    • 11) 0.580 16 × 2 = 1 + 0.160 32;
    • 12) 0.160 32 × 2 = 0 + 0.320 64;
    • 13) 0.320 64 × 2 = 0 + 0.641 28;
    • 14) 0.641 28 × 2 = 1 + 0.282 56;
    • 15) 0.282 56 × 2 = 0 + 0.565 12;
    • 16) 0.565 12 × 2 = 1 + 0.130 24;
    • 17) 0.130 24 × 2 = 0 + 0.260 48;
    • 18) 0.260 48 × 2 = 0 + 0.520 96;
    • 19) 0.520 96 × 2 = 1 + 0.041 92;
    • 20) 0.041 92 × 2 = 0 + 0.083 84;
    • 21) 0.083 84 × 2 = 0 + 0.167 68;
    • 22) 0.167 68 × 2 = 0 + 0.335 36;
    • 23) 0.335 36 × 2 = 0 + 0.670 72;
    • 24) 0.670 72 × 2 = 1 + 0.341 44;
    • 25) 0.341 44 × 2 = 0 + 0.682 88;
    • 26) 0.682 88 × 2 = 1 + 0.365 76;
    • 27) 0.365 76 × 2 = 0 + 0.731 52;
    • 28) 0.731 52 × 2 = 1 + 0.463 04;
    • 29) 0.463 04 × 2 = 0 + 0.926 08;
    • 30) 0.926 08 × 2 = 1 + 0.852 16;
    • 31) 0.852 16 × 2 = 1 + 0.704 32;
    • 32) 0.704 32 × 2 = 1 + 0.408 64;
    • 33) 0.408 64 × 2 = 0 + 0.817 28;
    • 34) 0.817 28 × 2 = 1 + 0.634 56;
    • 35) 0.634 56 × 2 = 1 + 0.269 12;
    • 36) 0.269 12 × 2 = 0 + 0.538 24;
    • 37) 0.538 24 × 2 = 1 + 0.076 48;
    • 38) 0.076 48 × 2 = 0 + 0.152 96;
    • 39) 0.152 96 × 2 = 0 + 0.305 92;
    • 40) 0.305 92 × 2 = 0 + 0.611 84;
    • 41) 0.611 84 × 2 = 1 + 0.223 68;
    • 42) 0.223 68 × 2 = 0 + 0.447 36;
    • 43) 0.447 36 × 2 = 0 + 0.894 72;
    • 44) 0.894 72 × 2 = 1 + 0.789 44;
    • 45) 0.789 44 × 2 = 1 + 0.578 88;
    • 46) 0.578 88 × 2 = 1 + 0.157 76;
    • 47) 0.157 76 × 2 = 0 + 0.315 52;
    • 48) 0.315 52 × 2 = 0 + 0.631 04;
    • 49) 0.631 04 × 2 = 1 + 0.262 08;
    • 50) 0.262 08 × 2 = 0 + 0.524 16;
    • 51) 0.524 16 × 2 = 1 + 0.048 32;
    • 52) 0.048 32 × 2 = 0 + 0.096 64;
    • 53) 0.096 64 × 2 = 0 + 0.193 28;
    • We didn't get any fractional part that was equal to zero. But we had enough iterations (over Mantissa limit = 52) and at least one integer part that was different from zero => FULL STOP (losing precision...).
  • 5. Construct the base 2 representation of the fractional part of the number, by taking all the integer parts of the previous multiplying operations, starting from the top of the constructed list above:

    0.640 215(10) = 0.1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2)

  • 6. Summarizing - the positive number before normalization:

    31.640 215(10) = 1 1111.1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2)

  • 7. Normalize the binary representation of the number, shifting the decimal mark 4 positions to the left so that only one non-zero digit stays to the left of the decimal mark:

    31.640 215(10) =
    1 1111.1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2) =
    1 1111.1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2) × 20 =
    1.1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0(2) × 24

  • 8. Up to this moment, there are the following elements that would feed into the 64 bit double precision IEEE 754 binary floating point representation:

    Sign: 1 (a negative number)

    Exponent (unadjusted): 4

    Mantissa (not-normalized): 1.1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0

  • 9. Adjust the exponent in 11 bit excess/bias notation and then convert it from decimal (base 10) to 11 bit binary (base 2), by using the same technique of repeatedly dividing it by 2, as shown above:

    Exponent (adjusted) = Exponent (unadjusted) + 2(11-1) - 1 = (4 + 1023)(10) = 1027(10) =
    100 0000 0011(2)

  • 10. Normalize mantissa, remove the leading (leftmost) bit, since it's allways '1' (and the decimal sign) and adjust its length to 52 bits, by removing the excess bits, from the right (losing precision...):

    Mantissa (not-normalized): 1.1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100 1010 0

    Mantissa (normalized): 1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100

  • Conclusion:

    Sign (1 bit) = 1 (a negative number)

    Exponent (8 bits) = 100 0000 0011

    Mantissa (52 bits) = 1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100

  • Number -31.640 215, converted from decimal system (base 10) to 64 bit double precision IEEE 754 binary floating point =
    1 - 100 0000 0011 - 1111 1010 0011 1110 0101 0010 0001 0101 0111 0110 1000 1001 1100