3.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 3.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2(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
3.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2(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: 3.
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;
  • 3 ÷ 2 = 1 + 1;
  • 1 ÷ 2 = 0 + 1;

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.

3(10) =

11(2)


3. Convert to binary (base 2) the fractional part: 0.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2.

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) 0.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2 × 2 = 0 + 0.283 185 307 179 586 476 925 286 766 559 005 768 394 338 798 750 211 641 949 889 184 615 632 812 572 418 038 4;
  • 2) 0.283 185 307 179 586 476 925 286 766 559 005 768 394 338 798 750 211 641 949 889 184 615 632 812 572 418 038 4 × 2 = 0 + 0.566 370 614 359 172 953 850 573 533 118 011 536 788 677 597 500 423 283 899 778 369 231 265 625 144 836 076 8;
  • 3) 0.566 370 614 359 172 953 850 573 533 118 011 536 788 677 597 500 423 283 899 778 369 231 265 625 144 836 076 8 × 2 = 1 + 0.132 741 228 718 345 907 701 147 066 236 023 073 577 355 195 000 846 567 799 556 738 462 531 250 289 672 153 6;
  • 4) 0.132 741 228 718 345 907 701 147 066 236 023 073 577 355 195 000 846 567 799 556 738 462 531 250 289 672 153 6 × 2 = 0 + 0.265 482 457 436 691 815 402 294 132 472 046 147 154 710 390 001 693 135 599 113 476 925 062 500 579 344 307 2;
  • 5) 0.265 482 457 436 691 815 402 294 132 472 046 147 154 710 390 001 693 135 599 113 476 925 062 500 579 344 307 2 × 2 = 0 + 0.530 964 914 873 383 630 804 588 264 944 092 294 309 420 780 003 386 271 198 226 953 850 125 001 158 688 614 4;
  • 6) 0.530 964 914 873 383 630 804 588 264 944 092 294 309 420 780 003 386 271 198 226 953 850 125 001 158 688 614 4 × 2 = 1 + 0.061 929 829 746 767 261 609 176 529 888 184 588 618 841 560 006 772 542 396 453 907 700 250 002 317 377 228 8;
  • 7) 0.061 929 829 746 767 261 609 176 529 888 184 588 618 841 560 006 772 542 396 453 907 700 250 002 317 377 228 8 × 2 = 0 + 0.123 859 659 493 534 523 218 353 059 776 369 177 237 683 120 013 545 084 792 907 815 400 500 004 634 754 457 6;
  • 8) 0.123 859 659 493 534 523 218 353 059 776 369 177 237 683 120 013 545 084 792 907 815 400 500 004 634 754 457 6 × 2 = 0 + 0.247 719 318 987 069 046 436 706 119 552 738 354 475 366 240 027 090 169 585 815 630 801 000 009 269 508 915 2;
  • 9) 0.247 719 318 987 069 046 436 706 119 552 738 354 475 366 240 027 090 169 585 815 630 801 000 009 269 508 915 2 × 2 = 0 + 0.495 438 637 974 138 092 873 412 239 105 476 708 950 732 480 054 180 339 171 631 261 602 000 018 539 017 830 4;
  • 10) 0.495 438 637 974 138 092 873 412 239 105 476 708 950 732 480 054 180 339 171 631 261 602 000 018 539 017 830 4 × 2 = 0 + 0.990 877 275 948 276 185 746 824 478 210 953 417 901 464 960 108 360 678 343 262 523 204 000 037 078 035 660 8;
  • 11) 0.990 877 275 948 276 185 746 824 478 210 953 417 901 464 960 108 360 678 343 262 523 204 000 037 078 035 660 8 × 2 = 1 + 0.981 754 551 896 552 371 493 648 956 421 906 835 802 929 920 216 721 356 686 525 046 408 000 074 156 071 321 6;
  • 12) 0.981 754 551 896 552 371 493 648 956 421 906 835 802 929 920 216 721 356 686 525 046 408 000 074 156 071 321 6 × 2 = 1 + 0.963 509 103 793 104 742 987 297 912 843 813 671 605 859 840 433 442 713 373 050 092 816 000 148 312 142 643 2;
  • 13) 0.963 509 103 793 104 742 987 297 912 843 813 671 605 859 840 433 442 713 373 050 092 816 000 148 312 142 643 2 × 2 = 1 + 0.927 018 207 586 209 485 974 595 825 687 627 343 211 719 680 866 885 426 746 100 185 632 000 296 624 285 286 4;
  • 14) 0.927 018 207 586 209 485 974 595 825 687 627 343 211 719 680 866 885 426 746 100 185 632 000 296 624 285 286 4 × 2 = 1 + 0.854 036 415 172 418 971 949 191 651 375 254 686 423 439 361 733 770 853 492 200 371 264 000 593 248 570 572 8;
  • 15) 0.854 036 415 172 418 971 949 191 651 375 254 686 423 439 361 733 770 853 492 200 371 264 000 593 248 570 572 8 × 2 = 1 + 0.708 072 830 344 837 943 898 383 302 750 509 372 846 878 723 467 541 706 984 400 742 528 001 186 497 141 145 6;
  • 16) 0.708 072 830 344 837 943 898 383 302 750 509 372 846 878 723 467 541 706 984 400 742 528 001 186 497 141 145 6 × 2 = 1 + 0.416 145 660 689 675 887 796 766 605 501 018 745 693 757 446 935 083 413 968 801 485 056 002 372 994 282 291 2;
  • 17) 0.416 145 660 689 675 887 796 766 605 501 018 745 693 757 446 935 083 413 968 801 485 056 002 372 994 282 291 2 × 2 = 0 + 0.832 291 321 379 351 775 593 533 211 002 037 491 387 514 893 870 166 827 937 602 970 112 004 745 988 564 582 4;
  • 18) 0.832 291 321 379 351 775 593 533 211 002 037 491 387 514 893 870 166 827 937 602 970 112 004 745 988 564 582 4 × 2 = 1 + 0.664 582 642 758 703 551 187 066 422 004 074 982 775 029 787 740 333 655 875 205 940 224 009 491 977 129 164 8;
  • 19) 0.664 582 642 758 703 551 187 066 422 004 074 982 775 029 787 740 333 655 875 205 940 224 009 491 977 129 164 8 × 2 = 1 + 0.329 165 285 517 407 102 374 132 844 008 149 965 550 059 575 480 667 311 750 411 880 448 018 983 954 258 329 6;
  • 20) 0.329 165 285 517 407 102 374 132 844 008 149 965 550 059 575 480 667 311 750 411 880 448 018 983 954 258 329 6 × 2 = 0 + 0.658 330 571 034 814 204 748 265 688 016 299 931 100 119 150 961 334 623 500 823 760 896 037 967 908 516 659 2;
  • 21) 0.658 330 571 034 814 204 748 265 688 016 299 931 100 119 150 961 334 623 500 823 760 896 037 967 908 516 659 2 × 2 = 1 + 0.316 661 142 069 628 409 496 531 376 032 599 862 200 238 301 922 669 247 001 647 521 792 075 935 817 033 318 4;
  • 22) 0.316 661 142 069 628 409 496 531 376 032 599 862 200 238 301 922 669 247 001 647 521 792 075 935 817 033 318 4 × 2 = 0 + 0.633 322 284 139 256 818 993 062 752 065 199 724 400 476 603 845 338 494 003 295 043 584 151 871 634 066 636 8;
  • 23) 0.633 322 284 139 256 818 993 062 752 065 199 724 400 476 603 845 338 494 003 295 043 584 151 871 634 066 636 8 × 2 = 1 + 0.266 644 568 278 513 637 986 125 504 130 399 448 800 953 207 690 676 988 006 590 087 168 303 743 268 133 273 6;
  • 24) 0.266 644 568 278 513 637 986 125 504 130 399 448 800 953 207 690 676 988 006 590 087 168 303 743 268 133 273 6 × 2 = 0 + 0.533 289 136 557 027 275 972 251 008 260 798 897 601 906 415 381 353 976 013 180 174 336 607 486 536 266 547 2;
  • 25) 0.533 289 136 557 027 275 972 251 008 260 798 897 601 906 415 381 353 976 013 180 174 336 607 486 536 266 547 2 × 2 = 1 + 0.066 578 273 114 054 551 944 502 016 521 597 795 203 812 830 762 707 952 026 360 348 673 214 973 072 533 094 4;
  • 26) 0.066 578 273 114 054 551 944 502 016 521 597 795 203 812 830 762 707 952 026 360 348 673 214 973 072 533 094 4 × 2 = 0 + 0.133 156 546 228 109 103 889 004 033 043 195 590 407 625 661 525 415 904 052 720 697 346 429 946 145 066 188 8;
  • 27) 0.133 156 546 228 109 103 889 004 033 043 195 590 407 625 661 525 415 904 052 720 697 346 429 946 145 066 188 8 × 2 = 0 + 0.266 313 092 456 218 207 778 008 066 086 391 180 815 251 323 050 831 808 105 441 394 692 859 892 290 132 377 6;
  • 28) 0.266 313 092 456 218 207 778 008 066 086 391 180 815 251 323 050 831 808 105 441 394 692 859 892 290 132 377 6 × 2 = 0 + 0.532 626 184 912 436 415 556 016 132 172 782 361 630 502 646 101 663 616 210 882 789 385 719 784 580 264 755 2;
  • 29) 0.532 626 184 912 436 415 556 016 132 172 782 361 630 502 646 101 663 616 210 882 789 385 719 784 580 264 755 2 × 2 = 1 + 0.065 252 369 824 872 831 112 032 264 345 564 723 261 005 292 203 327 232 421 765 578 771 439 569 160 529 510 4;
  • 30) 0.065 252 369 824 872 831 112 032 264 345 564 723 261 005 292 203 327 232 421 765 578 771 439 569 160 529 510 4 × 2 = 0 + 0.130 504 739 649 745 662 224 064 528 691 129 446 522 010 584 406 654 464 843 531 157 542 879 138 321 059 020 8;
  • 31) 0.130 504 739 649 745 662 224 064 528 691 129 446 522 010 584 406 654 464 843 531 157 542 879 138 321 059 020 8 × 2 = 0 + 0.261 009 479 299 491 324 448 129 057 382 258 893 044 021 168 813 308 929 687 062 315 085 758 276 642 118 041 6;
  • 32) 0.261 009 479 299 491 324 448 129 057 382 258 893 044 021 168 813 308 929 687 062 315 085 758 276 642 118 041 6 × 2 = 0 + 0.522 018 958 598 982 648 896 258 114 764 517 786 088 042 337 626 617 859 374 124 630 171 516 553 284 236 083 2;
  • 33) 0.522 018 958 598 982 648 896 258 114 764 517 786 088 042 337 626 617 859 374 124 630 171 516 553 284 236 083 2 × 2 = 1 + 0.044 037 917 197 965 297 792 516 229 529 035 572 176 084 675 253 235 718 748 249 260 343 033 106 568 472 166 4;
  • 34) 0.044 037 917 197 965 297 792 516 229 529 035 572 176 084 675 253 235 718 748 249 260 343 033 106 568 472 166 4 × 2 = 0 + 0.088 075 834 395 930 595 585 032 459 058 071 144 352 169 350 506 471 437 496 498 520 686 066 213 136 944 332 8;
  • 35) 0.088 075 834 395 930 595 585 032 459 058 071 144 352 169 350 506 471 437 496 498 520 686 066 213 136 944 332 8 × 2 = 0 + 0.176 151 668 791 861 191 170 064 918 116 142 288 704 338 701 012 942 874 992 997 041 372 132 426 273 888 665 6;
  • 36) 0.176 151 668 791 861 191 170 064 918 116 142 288 704 338 701 012 942 874 992 997 041 372 132 426 273 888 665 6 × 2 = 0 + 0.352 303 337 583 722 382 340 129 836 232 284 577 408 677 402 025 885 749 985 994 082 744 264 852 547 777 331 2;
  • 37) 0.352 303 337 583 722 382 340 129 836 232 284 577 408 677 402 025 885 749 985 994 082 744 264 852 547 777 331 2 × 2 = 0 + 0.704 606 675 167 444 764 680 259 672 464 569 154 817 354 804 051 771 499 971 988 165 488 529 705 095 554 662 4;
  • 38) 0.704 606 675 167 444 764 680 259 672 464 569 154 817 354 804 051 771 499 971 988 165 488 529 705 095 554 662 4 × 2 = 1 + 0.409 213 350 334 889 529 360 519 344 929 138 309 634 709 608 103 542 999 943 976 330 977 059 410 191 109 324 8;
  • 39) 0.409 213 350 334 889 529 360 519 344 929 138 309 634 709 608 103 542 999 943 976 330 977 059 410 191 109 324 8 × 2 = 0 + 0.818 426 700 669 779 058 721 038 689 858 276 619 269 419 216 207 085 999 887 952 661 954 118 820 382 218 649 6;
  • 40) 0.818 426 700 669 779 058 721 038 689 858 276 619 269 419 216 207 085 999 887 952 661 954 118 820 382 218 649 6 × 2 = 1 + 0.636 853 401 339 558 117 442 077 379 716 553 238 538 838 432 414 171 999 775 905 323 908 237 640 764 437 299 2;
  • 41) 0.636 853 401 339 558 117 442 077 379 716 553 238 538 838 432 414 171 999 775 905 323 908 237 640 764 437 299 2 × 2 = 1 + 0.273 706 802 679 116 234 884 154 759 433 106 477 077 676 864 828 343 999 551 810 647 816 475 281 528 874 598 4;
  • 42) 0.273 706 802 679 116 234 884 154 759 433 106 477 077 676 864 828 343 999 551 810 647 816 475 281 528 874 598 4 × 2 = 0 + 0.547 413 605 358 232 469 768 309 518 866 212 954 155 353 729 656 687 999 103 621 295 632 950 563 057 749 196 8;
  • 43) 0.547 413 605 358 232 469 768 309 518 866 212 954 155 353 729 656 687 999 103 621 295 632 950 563 057 749 196 8 × 2 = 1 + 0.094 827 210 716 464 939 536 619 037 732 425 908 310 707 459 313 375 998 207 242 591 265 901 126 115 498 393 6;
  • 44) 0.094 827 210 716 464 939 536 619 037 732 425 908 310 707 459 313 375 998 207 242 591 265 901 126 115 498 393 6 × 2 = 0 + 0.189 654 421 432 929 879 073 238 075 464 851 816 621 414 918 626 751 996 414 485 182 531 802 252 230 996 787 2;
  • 45) 0.189 654 421 432 929 879 073 238 075 464 851 816 621 414 918 626 751 996 414 485 182 531 802 252 230 996 787 2 × 2 = 0 + 0.379 308 842 865 859 758 146 476 150 929 703 633 242 829 837 253 503 992 828 970 365 063 604 504 461 993 574 4;
  • 46) 0.379 308 842 865 859 758 146 476 150 929 703 633 242 829 837 253 503 992 828 970 365 063 604 504 461 993 574 4 × 2 = 0 + 0.758 617 685 731 719 516 292 952 301 859 407 266 485 659 674 507 007 985 657 940 730 127 209 008 923 987 148 8;
  • 47) 0.758 617 685 731 719 516 292 952 301 859 407 266 485 659 674 507 007 985 657 940 730 127 209 008 923 987 148 8 × 2 = 1 + 0.517 235 371 463 439 032 585 904 603 718 814 532 971 319 349 014 015 971 315 881 460 254 418 017 847 974 297 6;
  • 48) 0.517 235 371 463 439 032 585 904 603 718 814 532 971 319 349 014 015 971 315 881 460 254 418 017 847 974 297 6 × 2 = 1 + 0.034 470 742 926 878 065 171 809 207 437 629 065 942 638 698 028 031 942 631 762 920 508 836 035 695 948 595 2;
  • 49) 0.034 470 742 926 878 065 171 809 207 437 629 065 942 638 698 028 031 942 631 762 920 508 836 035 695 948 595 2 × 2 = 0 + 0.068 941 485 853 756 130 343 618 414 875 258 131 885 277 396 056 063 885 263 525 841 017 672 071 391 897 190 4;
  • 50) 0.068 941 485 853 756 130 343 618 414 875 258 131 885 277 396 056 063 885 263 525 841 017 672 071 391 897 190 4 × 2 = 0 + 0.137 882 971 707 512 260 687 236 829 750 516 263 770 554 792 112 127 770 527 051 682 035 344 142 783 794 380 8;
  • 51) 0.137 882 971 707 512 260 687 236 829 750 516 263 770 554 792 112 127 770 527 051 682 035 344 142 783 794 380 8 × 2 = 0 + 0.275 765 943 415 024 521 374 473 659 501 032 527 541 109 584 224 255 541 054 103 364 070 688 285 567 588 761 6;
  • 52) 0.275 765 943 415 024 521 374 473 659 501 032 527 541 109 584 224 255 541 054 103 364 070 688 285 567 588 761 6 × 2 = 0 + 0.551 531 886 830 049 042 748 947 319 002 065 055 082 219 168 448 511 082 108 206 728 141 376 571 135 177 523 2;
  • 53) 0.551 531 886 830 049 042 748 947 319 002 065 055 082 219 168 448 511 082 108 206 728 141 376 571 135 177 523 2 × 2 = 1 + 0.103 063 773 660 098 085 497 894 638 004 130 110 164 438 336 897 022 164 216 413 456 282 753 142 270 355 046 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:


0.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2(10) =

0.0010 0100 0011 1111 0110 1010 1000 1000 1000 0101 1010 0011 0000 1(2)

5. Positive number before normalization:

3.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2(10) =

11.0010 0100 0011 1111 0110 1010 1000 1000 1000 0101 1010 0011 0000 1(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 1 positions to the left, so that only one non zero digit remains to the left of it:


3.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2(10) =

11.0010 0100 0011 1111 0110 1010 1000 1000 1000 0101 1010 0011 0000 1(2) =

11.0010 0100 0011 1111 0110 1010 1000 1000 1000 0101 1010 0011 0000 1(2) × 20 =

1.1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000 01(2) × 21


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): 1

Mantissa (not normalized):
1.1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000 01


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

1 + 2(11-1) - 1 =

(1 + 1 023)(10) =

1 024(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;
  • 1 024 ÷ 2 = 512 + 0;
  • 512 ÷ 2 = 256 + 0;
  • 256 ÷ 2 = 128 + 0;
  • 128 ÷ 2 = 64 + 0;
  • 64 ÷ 2 = 32 + 0;
  • 32 ÷ 2 = 16 + 0;
  • 16 ÷ 2 = 8 + 0;
  • 8 ÷ 2 = 4 + 0;
  • 4 ÷ 2 = 2 + 0;
  • 2 ÷ 2 = 1 + 0;
  • 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) =

1024(10) =

100 0000 0000(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, by removing the excess bits, from the right (if any of the excess bits is set on 1, we are losing precision...).


Mantissa (normalized) =

1. 1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000 01 =

1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000


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) =
100 0000 0000

Mantissa (52 bits) =
1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000


Decimal number 3.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 019 2 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 100 0000 0000 - 1001 0010 0001 1111 1011 0101 0100 0100 0100 0010 1101 0001 1000

» Convert decimal 3.141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 209 016 4 to 64 bit double precision IEEE 754 binary floating point representation standard

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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