0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484(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
0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484(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: 0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484.

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) 0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484 × 2 = 0 + 0.000 041 661 458 643 342 410 269 998 309 019 321 234 618 968;
  • 2) 0.000 041 661 458 643 342 410 269 998 309 019 321 234 618 968 × 2 = 0 + 0.000 083 322 917 286 684 820 539 996 618 038 642 469 237 936;
  • 3) 0.000 083 322 917 286 684 820 539 996 618 038 642 469 237 936 × 2 = 0 + 0.000 166 645 834 573 369 641 079 993 236 077 284 938 475 872;
  • 4) 0.000 166 645 834 573 369 641 079 993 236 077 284 938 475 872 × 2 = 0 + 0.000 333 291 669 146 739 282 159 986 472 154 569 876 951 744;
  • 5) 0.000 333 291 669 146 739 282 159 986 472 154 569 876 951 744 × 2 = 0 + 0.000 666 583 338 293 478 564 319 972 944 309 139 753 903 488;
  • 6) 0.000 666 583 338 293 478 564 319 972 944 309 139 753 903 488 × 2 = 0 + 0.001 333 166 676 586 957 128 639 945 888 618 279 507 806 976;
  • 7) 0.001 333 166 676 586 957 128 639 945 888 618 279 507 806 976 × 2 = 0 + 0.002 666 333 353 173 914 257 279 891 777 236 559 015 613 952;
  • 8) 0.002 666 333 353 173 914 257 279 891 777 236 559 015 613 952 × 2 = 0 + 0.005 332 666 706 347 828 514 559 783 554 473 118 031 227 904;
  • 9) 0.005 332 666 706 347 828 514 559 783 554 473 118 031 227 904 × 2 = 0 + 0.010 665 333 412 695 657 029 119 567 108 946 236 062 455 808;
  • 10) 0.010 665 333 412 695 657 029 119 567 108 946 236 062 455 808 × 2 = 0 + 0.021 330 666 825 391 314 058 239 134 217 892 472 124 911 616;
  • 11) 0.021 330 666 825 391 314 058 239 134 217 892 472 124 911 616 × 2 = 0 + 0.042 661 333 650 782 628 116 478 268 435 784 944 249 823 232;
  • 12) 0.042 661 333 650 782 628 116 478 268 435 784 944 249 823 232 × 2 = 0 + 0.085 322 667 301 565 256 232 956 536 871 569 888 499 646 464;
  • 13) 0.085 322 667 301 565 256 232 956 536 871 569 888 499 646 464 × 2 = 0 + 0.170 645 334 603 130 512 465 913 073 743 139 776 999 292 928;
  • 14) 0.170 645 334 603 130 512 465 913 073 743 139 776 999 292 928 × 2 = 0 + 0.341 290 669 206 261 024 931 826 147 486 279 553 998 585 856;
  • 15) 0.341 290 669 206 261 024 931 826 147 486 279 553 998 585 856 × 2 = 0 + 0.682 581 338 412 522 049 863 652 294 972 559 107 997 171 712;
  • 16) 0.682 581 338 412 522 049 863 652 294 972 559 107 997 171 712 × 2 = 1 + 0.365 162 676 825 044 099 727 304 589 945 118 215 994 343 424;
  • 17) 0.365 162 676 825 044 099 727 304 589 945 118 215 994 343 424 × 2 = 0 + 0.730 325 353 650 088 199 454 609 179 890 236 431 988 686 848;
  • 18) 0.730 325 353 650 088 199 454 609 179 890 236 431 988 686 848 × 2 = 1 + 0.460 650 707 300 176 398 909 218 359 780 472 863 977 373 696;
  • 19) 0.460 650 707 300 176 398 909 218 359 780 472 863 977 373 696 × 2 = 0 + 0.921 301 414 600 352 797 818 436 719 560 945 727 954 747 392;
  • 20) 0.921 301 414 600 352 797 818 436 719 560 945 727 954 747 392 × 2 = 1 + 0.842 602 829 200 705 595 636 873 439 121 891 455 909 494 784;
  • 21) 0.842 602 829 200 705 595 636 873 439 121 891 455 909 494 784 × 2 = 1 + 0.685 205 658 401 411 191 273 746 878 243 782 911 818 989 568;
  • 22) 0.685 205 658 401 411 191 273 746 878 243 782 911 818 989 568 × 2 = 1 + 0.370 411 316 802 822 382 547 493 756 487 565 823 637 979 136;
  • 23) 0.370 411 316 802 822 382 547 493 756 487 565 823 637 979 136 × 2 = 0 + 0.740 822 633 605 644 765 094 987 512 975 131 647 275 958 272;
  • 24) 0.740 822 633 605 644 765 094 987 512 975 131 647 275 958 272 × 2 = 1 + 0.481 645 267 211 289 530 189 975 025 950 263 294 551 916 544;
  • 25) 0.481 645 267 211 289 530 189 975 025 950 263 294 551 916 544 × 2 = 0 + 0.963 290 534 422 579 060 379 950 051 900 526 589 103 833 088;
  • 26) 0.963 290 534 422 579 060 379 950 051 900 526 589 103 833 088 × 2 = 1 + 0.926 581 068 845 158 120 759 900 103 801 053 178 207 666 176;
  • 27) 0.926 581 068 845 158 120 759 900 103 801 053 178 207 666 176 × 2 = 1 + 0.853 162 137 690 316 241 519 800 207 602 106 356 415 332 352;
  • 28) 0.853 162 137 690 316 241 519 800 207 602 106 356 415 332 352 × 2 = 1 + 0.706 324 275 380 632 483 039 600 415 204 212 712 830 664 704;
  • 29) 0.706 324 275 380 632 483 039 600 415 204 212 712 830 664 704 × 2 = 1 + 0.412 648 550 761 264 966 079 200 830 408 425 425 661 329 408;
  • 30) 0.412 648 550 761 264 966 079 200 830 408 425 425 661 329 408 × 2 = 0 + 0.825 297 101 522 529 932 158 401 660 816 850 851 322 658 816;
  • 31) 0.825 297 101 522 529 932 158 401 660 816 850 851 322 658 816 × 2 = 1 + 0.650 594 203 045 059 864 316 803 321 633 701 702 645 317 632;
  • 32) 0.650 594 203 045 059 864 316 803 321 633 701 702 645 317 632 × 2 = 1 + 0.301 188 406 090 119 728 633 606 643 267 403 405 290 635 264;
  • 33) 0.301 188 406 090 119 728 633 606 643 267 403 405 290 635 264 × 2 = 0 + 0.602 376 812 180 239 457 267 213 286 534 806 810 581 270 528;
  • 34) 0.602 376 812 180 239 457 267 213 286 534 806 810 581 270 528 × 2 = 1 + 0.204 753 624 360 478 914 534 426 573 069 613 621 162 541 056;
  • 35) 0.204 753 624 360 478 914 534 426 573 069 613 621 162 541 056 × 2 = 0 + 0.409 507 248 720 957 829 068 853 146 139 227 242 325 082 112;
  • 36) 0.409 507 248 720 957 829 068 853 146 139 227 242 325 082 112 × 2 = 0 + 0.819 014 497 441 915 658 137 706 292 278 454 484 650 164 224;
  • 37) 0.819 014 497 441 915 658 137 706 292 278 454 484 650 164 224 × 2 = 1 + 0.638 028 994 883 831 316 275 412 584 556 908 969 300 328 448;
  • 38) 0.638 028 994 883 831 316 275 412 584 556 908 969 300 328 448 × 2 = 1 + 0.276 057 989 767 662 632 550 825 169 113 817 938 600 656 896;
  • 39) 0.276 057 989 767 662 632 550 825 169 113 817 938 600 656 896 × 2 = 0 + 0.552 115 979 535 325 265 101 650 338 227 635 877 201 313 792;
  • 40) 0.552 115 979 535 325 265 101 650 338 227 635 877 201 313 792 × 2 = 1 + 0.104 231 959 070 650 530 203 300 676 455 271 754 402 627 584;
  • 41) 0.104 231 959 070 650 530 203 300 676 455 271 754 402 627 584 × 2 = 0 + 0.208 463 918 141 301 060 406 601 352 910 543 508 805 255 168;
  • 42) 0.208 463 918 141 301 060 406 601 352 910 543 508 805 255 168 × 2 = 0 + 0.416 927 836 282 602 120 813 202 705 821 087 017 610 510 336;
  • 43) 0.416 927 836 282 602 120 813 202 705 821 087 017 610 510 336 × 2 = 0 + 0.833 855 672 565 204 241 626 405 411 642 174 035 221 020 672;
  • 44) 0.833 855 672 565 204 241 626 405 411 642 174 035 221 020 672 × 2 = 1 + 0.667 711 345 130 408 483 252 810 823 284 348 070 442 041 344;
  • 45) 0.667 711 345 130 408 483 252 810 823 284 348 070 442 041 344 × 2 = 1 + 0.335 422 690 260 816 966 505 621 646 568 696 140 884 082 688;
  • 46) 0.335 422 690 260 816 966 505 621 646 568 696 140 884 082 688 × 2 = 0 + 0.670 845 380 521 633 933 011 243 293 137 392 281 768 165 376;
  • 47) 0.670 845 380 521 633 933 011 243 293 137 392 281 768 165 376 × 2 = 1 + 0.341 690 761 043 267 866 022 486 586 274 784 563 536 330 752;
  • 48) 0.341 690 761 043 267 866 022 486 586 274 784 563 536 330 752 × 2 = 0 + 0.683 381 522 086 535 732 044 973 172 549 569 127 072 661 504;
  • 49) 0.683 381 522 086 535 732 044 973 172 549 569 127 072 661 504 × 2 = 1 + 0.366 763 044 173 071 464 089 946 345 099 138 254 145 323 008;
  • 50) 0.366 763 044 173 071 464 089 946 345 099 138 254 145 323 008 × 2 = 0 + 0.733 526 088 346 142 928 179 892 690 198 276 508 290 646 016;
  • 51) 0.733 526 088 346 142 928 179 892 690 198 276 508 290 646 016 × 2 = 1 + 0.467 052 176 692 285 856 359 785 380 396 553 016 581 292 032;
  • 52) 0.467 052 176 692 285 856 359 785 380 396 553 016 581 292 032 × 2 = 0 + 0.934 104 353 384 571 712 719 570 760 793 106 033 162 584 064;
  • 53) 0.934 104 353 384 571 712 719 570 760 793 106 033 162 584 064 × 2 = 1 + 0.868 208 706 769 143 425 439 141 521 586 212 066 325 168 128;
  • 54) 0.868 208 706 769 143 425 439 141 521 586 212 066 325 168 128 × 2 = 1 + 0.736 417 413 538 286 850 878 283 043 172 424 132 650 336 256;
  • 55) 0.736 417 413 538 286 850 878 283 043 172 424 132 650 336 256 × 2 = 1 + 0.472 834 827 076 573 701 756 566 086 344 848 265 300 672 512;
  • 56) 0.472 834 827 076 573 701 756 566 086 344 848 265 300 672 512 × 2 = 0 + 0.945 669 654 153 147 403 513 132 172 689 696 530 601 345 024;
  • 57) 0.945 669 654 153 147 403 513 132 172 689 696 530 601 345 024 × 2 = 1 + 0.891 339 308 306 294 807 026 264 345 379 393 061 202 690 048;
  • 58) 0.891 339 308 306 294 807 026 264 345 379 393 061 202 690 048 × 2 = 1 + 0.782 678 616 612 589 614 052 528 690 758 786 122 405 380 096;
  • 59) 0.782 678 616 612 589 614 052 528 690 758 786 122 405 380 096 × 2 = 1 + 0.565 357 233 225 179 228 105 057 381 517 572 244 810 760 192;
  • 60) 0.565 357 233 225 179 228 105 057 381 517 572 244 810 760 192 × 2 = 1 + 0.130 714 466 450 358 456 210 114 763 035 144 489 621 520 384;
  • 61) 0.130 714 466 450 358 456 210 114 763 035 144 489 621 520 384 × 2 = 0 + 0.261 428 932 900 716 912 420 229 526 070 288 979 243 040 768;
  • 62) 0.261 428 932 900 716 912 420 229 526 070 288 979 243 040 768 × 2 = 0 + 0.522 857 865 801 433 824 840 459 052 140 577 958 486 081 536;
  • 63) 0.522 857 865 801 433 824 840 459 052 140 577 958 486 081 536 × 2 = 1 + 0.045 715 731 602 867 649 680 918 104 281 155 916 972 163 072;
  • 64) 0.045 715 731 602 867 649 680 918 104 281 155 916 972 163 072 × 2 = 0 + 0.091 431 463 205 735 299 361 836 208 562 311 833 944 326 144;
  • 65) 0.091 431 463 205 735 299 361 836 208 562 311 833 944 326 144 × 2 = 0 + 0.182 862 926 411 470 598 723 672 417 124 623 667 888 652 288;
  • 66) 0.182 862 926 411 470 598 723 672 417 124 623 667 888 652 288 × 2 = 0 + 0.365 725 852 822 941 197 447 344 834 249 247 335 777 304 576;
  • 67) 0.365 725 852 822 941 197 447 344 834 249 247 335 777 304 576 × 2 = 0 + 0.731 451 705 645 882 394 894 689 668 498 494 671 554 609 152;
  • 68) 0.731 451 705 645 882 394 894 689 668 498 494 671 554 609 152 × 2 = 1 + 0.462 903 411 291 764 789 789 379 336 996 989 343 109 218 304;

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:


0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484(10) =

0.0000 0000 0000 0001 0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001(2)

5. Positive number before normalization:

0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484(10) =

0.0000 0000 0000 0001 0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 16 positions to the right, so that only one non zero digit remains to the left of it:


0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484(10) =

0.0000 0000 0000 0001 0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001(2) =

0.0000 0000 0000 0001 0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001(2) × 20 =

1.0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001(2) × 2-16


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): -16

Mantissa (not normalized):
1.0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

-16 + 2(11-1) - 1 =

(-16 + 1 023)(10) =

1 007(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;
  • 1 007 ÷ 2 = 503 + 1;
  • 503 ÷ 2 = 251 + 1;
  • 251 ÷ 2 = 125 + 1;
  • 125 ÷ 2 = 62 + 1;
  • 62 ÷ 2 = 31 + 0;
  • 31 ÷ 2 = 15 + 1;
  • 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) =

1007(10) =

011 1110 1111(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. 0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001 =

0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001


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 1110 1111

Mantissa (52 bits) =
0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001


Decimal number 0.000 020 830 729 321 671 205 134 999 154 509 660 617 309 484 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 011 1110 1111 - 0101 1101 0111 1011 0100 1101 0001 1010 1010 1110 1111 0010 0001

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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