0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97(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
0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97(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: 0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97.

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) 0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97 × 2 = 0 + 0.062 831 853 071 795 864 769 252 867 665 590 057 683 943 387 987 505 94;
  • 2) 0.062 831 853 071 795 864 769 252 867 665 590 057 683 943 387 987 505 94 × 2 = 0 + 0.125 663 706 143 591 729 538 505 735 331 180 115 367 886 775 975 011 88;
  • 3) 0.125 663 706 143 591 729 538 505 735 331 180 115 367 886 775 975 011 88 × 2 = 0 + 0.251 327 412 287 183 459 077 011 470 662 360 230 735 773 551 950 023 76;
  • 4) 0.251 327 412 287 183 459 077 011 470 662 360 230 735 773 551 950 023 76 × 2 = 0 + 0.502 654 824 574 366 918 154 022 941 324 720 461 471 547 103 900 047 52;
  • 5) 0.502 654 824 574 366 918 154 022 941 324 720 461 471 547 103 900 047 52 × 2 = 1 + 0.005 309 649 148 733 836 308 045 882 649 440 922 943 094 207 800 095 04;
  • 6) 0.005 309 649 148 733 836 308 045 882 649 440 922 943 094 207 800 095 04 × 2 = 0 + 0.010 619 298 297 467 672 616 091 765 298 881 845 886 188 415 600 190 08;
  • 7) 0.010 619 298 297 467 672 616 091 765 298 881 845 886 188 415 600 190 08 × 2 = 0 + 0.021 238 596 594 935 345 232 183 530 597 763 691 772 376 831 200 380 16;
  • 8) 0.021 238 596 594 935 345 232 183 530 597 763 691 772 376 831 200 380 16 × 2 = 0 + 0.042 477 193 189 870 690 464 367 061 195 527 383 544 753 662 400 760 32;
  • 9) 0.042 477 193 189 870 690 464 367 061 195 527 383 544 753 662 400 760 32 × 2 = 0 + 0.084 954 386 379 741 380 928 734 122 391 054 767 089 507 324 801 520 64;
  • 10) 0.084 954 386 379 741 380 928 734 122 391 054 767 089 507 324 801 520 64 × 2 = 0 + 0.169 908 772 759 482 761 857 468 244 782 109 534 179 014 649 603 041 28;
  • 11) 0.169 908 772 759 482 761 857 468 244 782 109 534 179 014 649 603 041 28 × 2 = 0 + 0.339 817 545 518 965 523 714 936 489 564 219 068 358 029 299 206 082 56;
  • 12) 0.339 817 545 518 965 523 714 936 489 564 219 068 358 029 299 206 082 56 × 2 = 0 + 0.679 635 091 037 931 047 429 872 979 128 438 136 716 058 598 412 165 12;
  • 13) 0.679 635 091 037 931 047 429 872 979 128 438 136 716 058 598 412 165 12 × 2 = 1 + 0.359 270 182 075 862 094 859 745 958 256 876 273 432 117 196 824 330 24;
  • 14) 0.359 270 182 075 862 094 859 745 958 256 876 273 432 117 196 824 330 24 × 2 = 0 + 0.718 540 364 151 724 189 719 491 916 513 752 546 864 234 393 648 660 48;
  • 15) 0.718 540 364 151 724 189 719 491 916 513 752 546 864 234 393 648 660 48 × 2 = 1 + 0.437 080 728 303 448 379 438 983 833 027 505 093 728 468 787 297 320 96;
  • 16) 0.437 080 728 303 448 379 438 983 833 027 505 093 728 468 787 297 320 96 × 2 = 0 + 0.874 161 456 606 896 758 877 967 666 055 010 187 456 937 574 594 641 92;
  • 17) 0.874 161 456 606 896 758 877 967 666 055 010 187 456 937 574 594 641 92 × 2 = 1 + 0.748 322 913 213 793 517 755 935 332 110 020 374 913 875 149 189 283 84;
  • 18) 0.748 322 913 213 793 517 755 935 332 110 020 374 913 875 149 189 283 84 × 2 = 1 + 0.496 645 826 427 587 035 511 870 664 220 040 749 827 750 298 378 567 68;
  • 19) 0.496 645 826 427 587 035 511 870 664 220 040 749 827 750 298 378 567 68 × 2 = 0 + 0.993 291 652 855 174 071 023 741 328 440 081 499 655 500 596 757 135 36;
  • 20) 0.993 291 652 855 174 071 023 741 328 440 081 499 655 500 596 757 135 36 × 2 = 1 + 0.986 583 305 710 348 142 047 482 656 880 162 999 311 001 193 514 270 72;
  • 21) 0.986 583 305 710 348 142 047 482 656 880 162 999 311 001 193 514 270 72 × 2 = 1 + 0.973 166 611 420 696 284 094 965 313 760 325 998 622 002 387 028 541 44;
  • 22) 0.973 166 611 420 696 284 094 965 313 760 325 998 622 002 387 028 541 44 × 2 = 1 + 0.946 333 222 841 392 568 189 930 627 520 651 997 244 004 774 057 082 88;
  • 23) 0.946 333 222 841 392 568 189 930 627 520 651 997 244 004 774 057 082 88 × 2 = 1 + 0.892 666 445 682 785 136 379 861 255 041 303 994 488 009 548 114 165 76;
  • 24) 0.892 666 445 682 785 136 379 861 255 041 303 994 488 009 548 114 165 76 × 2 = 1 + 0.785 332 891 365 570 272 759 722 510 082 607 988 976 019 096 228 331 52;
  • 25) 0.785 332 891 365 570 272 759 722 510 082 607 988 976 019 096 228 331 52 × 2 = 1 + 0.570 665 782 731 140 545 519 445 020 165 215 977 952 038 192 456 663 04;
  • 26) 0.570 665 782 731 140 545 519 445 020 165 215 977 952 038 192 456 663 04 × 2 = 1 + 0.141 331 565 462 281 091 038 890 040 330 431 955 904 076 384 913 326 08;
  • 27) 0.141 331 565 462 281 091 038 890 040 330 431 955 904 076 384 913 326 08 × 2 = 0 + 0.282 663 130 924 562 182 077 780 080 660 863 911 808 152 769 826 652 16;
  • 28) 0.282 663 130 924 562 182 077 780 080 660 863 911 808 152 769 826 652 16 × 2 = 0 + 0.565 326 261 849 124 364 155 560 161 321 727 823 616 305 539 653 304 32;
  • 29) 0.565 326 261 849 124 364 155 560 161 321 727 823 616 305 539 653 304 32 × 2 = 1 + 0.130 652 523 698 248 728 311 120 322 643 455 647 232 611 079 306 608 64;
  • 30) 0.130 652 523 698 248 728 311 120 322 643 455 647 232 611 079 306 608 64 × 2 = 0 + 0.261 305 047 396 497 456 622 240 645 286 911 294 465 222 158 613 217 28;
  • 31) 0.261 305 047 396 497 456 622 240 645 286 911 294 465 222 158 613 217 28 × 2 = 0 + 0.522 610 094 792 994 913 244 481 290 573 822 588 930 444 317 226 434 56;
  • 32) 0.522 610 094 792 994 913 244 481 290 573 822 588 930 444 317 226 434 56 × 2 = 1 + 0.045 220 189 585 989 826 488 962 581 147 645 177 860 888 634 452 869 12;
  • 33) 0.045 220 189 585 989 826 488 962 581 147 645 177 860 888 634 452 869 12 × 2 = 0 + 0.090 440 379 171 979 652 977 925 162 295 290 355 721 777 268 905 738 24;
  • 34) 0.090 440 379 171 979 652 977 925 162 295 290 355 721 777 268 905 738 24 × 2 = 0 + 0.180 880 758 343 959 305 955 850 324 590 580 711 443 554 537 811 476 48;
  • 35) 0.180 880 758 343 959 305 955 850 324 590 580 711 443 554 537 811 476 48 × 2 = 0 + 0.361 761 516 687 918 611 911 700 649 181 161 422 887 109 075 622 952 96;
  • 36) 0.361 761 516 687 918 611 911 700 649 181 161 422 887 109 075 622 952 96 × 2 = 0 + 0.723 523 033 375 837 223 823 401 298 362 322 845 774 218 151 245 905 92;
  • 37) 0.723 523 033 375 837 223 823 401 298 362 322 845 774 218 151 245 905 92 × 2 = 1 + 0.447 046 066 751 674 447 646 802 596 724 645 691 548 436 302 491 811 84;
  • 38) 0.447 046 066 751 674 447 646 802 596 724 645 691 548 436 302 491 811 84 × 2 = 0 + 0.894 092 133 503 348 895 293 605 193 449 291 383 096 872 604 983 623 68;
  • 39) 0.894 092 133 503 348 895 293 605 193 449 291 383 096 872 604 983 623 68 × 2 = 1 + 0.788 184 267 006 697 790 587 210 386 898 582 766 193 745 209 967 247 36;
  • 40) 0.788 184 267 006 697 790 587 210 386 898 582 766 193 745 209 967 247 36 × 2 = 1 + 0.576 368 534 013 395 581 174 420 773 797 165 532 387 490 419 934 494 72;
  • 41) 0.576 368 534 013 395 581 174 420 773 797 165 532 387 490 419 934 494 72 × 2 = 1 + 0.152 737 068 026 791 162 348 841 547 594 331 064 774 980 839 868 989 44;
  • 42) 0.152 737 068 026 791 162 348 841 547 594 331 064 774 980 839 868 989 44 × 2 = 0 + 0.305 474 136 053 582 324 697 683 095 188 662 129 549 961 679 737 978 88;
  • 43) 0.305 474 136 053 582 324 697 683 095 188 662 129 549 961 679 737 978 88 × 2 = 0 + 0.610 948 272 107 164 649 395 366 190 377 324 259 099 923 359 475 957 76;
  • 44) 0.610 948 272 107 164 649 395 366 190 377 324 259 099 923 359 475 957 76 × 2 = 1 + 0.221 896 544 214 329 298 790 732 380 754 648 518 199 846 718 951 915 52;
  • 45) 0.221 896 544 214 329 298 790 732 380 754 648 518 199 846 718 951 915 52 × 2 = 0 + 0.443 793 088 428 658 597 581 464 761 509 297 036 399 693 437 903 831 04;
  • 46) 0.443 793 088 428 658 597 581 464 761 509 297 036 399 693 437 903 831 04 × 2 = 0 + 0.887 586 176 857 317 195 162 929 523 018 594 072 799 386 875 807 662 08;
  • 47) 0.887 586 176 857 317 195 162 929 523 018 594 072 799 386 875 807 662 08 × 2 = 1 + 0.775 172 353 714 634 390 325 859 046 037 188 145 598 773 751 615 324 16;
  • 48) 0.775 172 353 714 634 390 325 859 046 037 188 145 598 773 751 615 324 16 × 2 = 1 + 0.550 344 707 429 268 780 651 718 092 074 376 291 197 547 503 230 648 32;
  • 49) 0.550 344 707 429 268 780 651 718 092 074 376 291 197 547 503 230 648 32 × 2 = 1 + 0.100 689 414 858 537 561 303 436 184 148 752 582 395 095 006 461 296 64;
  • 50) 0.100 689 414 858 537 561 303 436 184 148 752 582 395 095 006 461 296 64 × 2 = 0 + 0.201 378 829 717 075 122 606 872 368 297 505 164 790 190 012 922 593 28;
  • 51) 0.201 378 829 717 075 122 606 872 368 297 505 164 790 190 012 922 593 28 × 2 = 0 + 0.402 757 659 434 150 245 213 744 736 595 010 329 580 380 025 845 186 56;
  • 52) 0.402 757 659 434 150 245 213 744 736 595 010 329 580 380 025 845 186 56 × 2 = 0 + 0.805 515 318 868 300 490 427 489 473 190 020 659 160 760 051 690 373 12;
  • 53) 0.805 515 318 868 300 490 427 489 473 190 020 659 160 760 051 690 373 12 × 2 = 1 + 0.611 030 637 736 600 980 854 978 946 380 041 318 321 520 103 380 746 24;
  • 54) 0.611 030 637 736 600 980 854 978 946 380 041 318 321 520 103 380 746 24 × 2 = 1 + 0.222 061 275 473 201 961 709 957 892 760 082 636 643 040 206 761 492 48;
  • 55) 0.222 061 275 473 201 961 709 957 892 760 082 636 643 040 206 761 492 48 × 2 = 0 + 0.444 122 550 946 403 923 419 915 785 520 165 273 286 080 413 522 984 96;
  • 56) 0.444 122 550 946 403 923 419 915 785 520 165 273 286 080 413 522 984 96 × 2 = 0 + 0.888 245 101 892 807 846 839 831 571 040 330 546 572 160 827 045 969 92;
  • 57) 0.888 245 101 892 807 846 839 831 571 040 330 546 572 160 827 045 969 92 × 2 = 1 + 0.776 490 203 785 615 693 679 663 142 080 661 093 144 321 654 091 939 84;

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:


0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97(10) =

0.0000 1000 0000 1010 1101 1111 1100 1001 0000 1011 1001 0011 1000 1100 1(2)

5. Positive number before normalization:

0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97(10) =

0.0000 1000 0000 1010 1101 1111 1100 1001 0000 1011 1001 0011 1000 1100 1(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 5 positions to the right, so that only one non zero digit remains to the left of it:


0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97(10) =

0.0000 1000 0000 1010 1101 1111 1100 1001 0000 1011 1001 0011 1000 1100 1(2) =

0.0000 1000 0000 1010 1101 1111 1100 1001 0000 1011 1001 0011 1000 1100 1(2) × 20 =

1.0000 0001 0101 1011 1111 1001 0010 0001 0111 0010 0111 0001 1001(2) × 2-5


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): -5

Mantissa (not normalized):
1.0000 0001 0101 1011 1111 1001 0010 0001 0111 0010 0111 0001 1001


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

-5 + 2(11-1) - 1 =

(-5 + 1 023)(10) =

1 018(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;
  • 1 018 ÷ 2 = 509 + 0;
  • 509 ÷ 2 = 254 + 1;
  • 254 ÷ 2 = 127 + 0;
  • 127 ÷ 2 = 63 + 1;
  • 63 ÷ 2 = 31 + 1;
  • 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) =

1018(10) =

011 1111 1010(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. 0000 0001 0101 1011 1111 1001 0010 0001 0111 0010 0111 0001 1001 =

0000 0001 0101 1011 1111 1001 0010 0001 0111 0010 0111 0001 1001


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 1111 1010

Mantissa (52 bits) =
0000 0001 0101 1011 1111 1001 0010 0001 0111 0010 0111 0001 1001


Decimal number 0.031 415 926 535 897 932 384 626 433 832 795 028 841 971 693 993 752 97 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 011 1111 1010 - 0000 0001 0101 1011 1111 1001 0010 0001 0111 0010 0111 0001 1001

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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