0.000 020 830 729 321 671 205 134 999 154 509 660 617 62 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 62(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 62(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 62.

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 62 × 2 = 0 + 0.000 041 661 458 643 342 410 269 998 309 019 321 235 24;
  • 2) 0.000 041 661 458 643 342 410 269 998 309 019 321 235 24 × 2 = 0 + 0.000 083 322 917 286 684 820 539 996 618 038 642 470 48;
  • 3) 0.000 083 322 917 286 684 820 539 996 618 038 642 470 48 × 2 = 0 + 0.000 166 645 834 573 369 641 079 993 236 077 284 940 96;
  • 4) 0.000 166 645 834 573 369 641 079 993 236 077 284 940 96 × 2 = 0 + 0.000 333 291 669 146 739 282 159 986 472 154 569 881 92;
  • 5) 0.000 333 291 669 146 739 282 159 986 472 154 569 881 92 × 2 = 0 + 0.000 666 583 338 293 478 564 319 972 944 309 139 763 84;
  • 6) 0.000 666 583 338 293 478 564 319 972 944 309 139 763 84 × 2 = 0 + 0.001 333 166 676 586 957 128 639 945 888 618 279 527 68;
  • 7) 0.001 333 166 676 586 957 128 639 945 888 618 279 527 68 × 2 = 0 + 0.002 666 333 353 173 914 257 279 891 777 236 559 055 36;
  • 8) 0.002 666 333 353 173 914 257 279 891 777 236 559 055 36 × 2 = 0 + 0.005 332 666 706 347 828 514 559 783 554 473 118 110 72;
  • 9) 0.005 332 666 706 347 828 514 559 783 554 473 118 110 72 × 2 = 0 + 0.010 665 333 412 695 657 029 119 567 108 946 236 221 44;
  • 10) 0.010 665 333 412 695 657 029 119 567 108 946 236 221 44 × 2 = 0 + 0.021 330 666 825 391 314 058 239 134 217 892 472 442 88;
  • 11) 0.021 330 666 825 391 314 058 239 134 217 892 472 442 88 × 2 = 0 + 0.042 661 333 650 782 628 116 478 268 435 784 944 885 76;
  • 12) 0.042 661 333 650 782 628 116 478 268 435 784 944 885 76 × 2 = 0 + 0.085 322 667 301 565 256 232 956 536 871 569 889 771 52;
  • 13) 0.085 322 667 301 565 256 232 956 536 871 569 889 771 52 × 2 = 0 + 0.170 645 334 603 130 512 465 913 073 743 139 779 543 04;
  • 14) 0.170 645 334 603 130 512 465 913 073 743 139 779 543 04 × 2 = 0 + 0.341 290 669 206 261 024 931 826 147 486 279 559 086 08;
  • 15) 0.341 290 669 206 261 024 931 826 147 486 279 559 086 08 × 2 = 0 + 0.682 581 338 412 522 049 863 652 294 972 559 118 172 16;
  • 16) 0.682 581 338 412 522 049 863 652 294 972 559 118 172 16 × 2 = 1 + 0.365 162 676 825 044 099 727 304 589 945 118 236 344 32;
  • 17) 0.365 162 676 825 044 099 727 304 589 945 118 236 344 32 × 2 = 0 + 0.730 325 353 650 088 199 454 609 179 890 236 472 688 64;
  • 18) 0.730 325 353 650 088 199 454 609 179 890 236 472 688 64 × 2 = 1 + 0.460 650 707 300 176 398 909 218 359 780 472 945 377 28;
  • 19) 0.460 650 707 300 176 398 909 218 359 780 472 945 377 28 × 2 = 0 + 0.921 301 414 600 352 797 818 436 719 560 945 890 754 56;
  • 20) 0.921 301 414 600 352 797 818 436 719 560 945 890 754 56 × 2 = 1 + 0.842 602 829 200 705 595 636 873 439 121 891 781 509 12;
  • 21) 0.842 602 829 200 705 595 636 873 439 121 891 781 509 12 × 2 = 1 + 0.685 205 658 401 411 191 273 746 878 243 783 563 018 24;
  • 22) 0.685 205 658 401 411 191 273 746 878 243 783 563 018 24 × 2 = 1 + 0.370 411 316 802 822 382 547 493 756 487 567 126 036 48;
  • 23) 0.370 411 316 802 822 382 547 493 756 487 567 126 036 48 × 2 = 0 + 0.740 822 633 605 644 765 094 987 512 975 134 252 072 96;
  • 24) 0.740 822 633 605 644 765 094 987 512 975 134 252 072 96 × 2 = 1 + 0.481 645 267 211 289 530 189 975 025 950 268 504 145 92;
  • 25) 0.481 645 267 211 289 530 189 975 025 950 268 504 145 92 × 2 = 0 + 0.963 290 534 422 579 060 379 950 051 900 537 008 291 84;
  • 26) 0.963 290 534 422 579 060 379 950 051 900 537 008 291 84 × 2 = 1 + 0.926 581 068 845 158 120 759 900 103 801 074 016 583 68;
  • 27) 0.926 581 068 845 158 120 759 900 103 801 074 016 583 68 × 2 = 1 + 0.853 162 137 690 316 241 519 800 207 602 148 033 167 36;
  • 28) 0.853 162 137 690 316 241 519 800 207 602 148 033 167 36 × 2 = 1 + 0.706 324 275 380 632 483 039 600 415 204 296 066 334 72;
  • 29) 0.706 324 275 380 632 483 039 600 415 204 296 066 334 72 × 2 = 1 + 0.412 648 550 761 264 966 079 200 830 408 592 132 669 44;
  • 30) 0.412 648 550 761 264 966 079 200 830 408 592 132 669 44 × 2 = 0 + 0.825 297 101 522 529 932 158 401 660 817 184 265 338 88;
  • 31) 0.825 297 101 522 529 932 158 401 660 817 184 265 338 88 × 2 = 1 + 0.650 594 203 045 059 864 316 803 321 634 368 530 677 76;
  • 32) 0.650 594 203 045 059 864 316 803 321 634 368 530 677 76 × 2 = 1 + 0.301 188 406 090 119 728 633 606 643 268 737 061 355 52;
  • 33) 0.301 188 406 090 119 728 633 606 643 268 737 061 355 52 × 2 = 0 + 0.602 376 812 180 239 457 267 213 286 537 474 122 711 04;
  • 34) 0.602 376 812 180 239 457 267 213 286 537 474 122 711 04 × 2 = 1 + 0.204 753 624 360 478 914 534 426 573 074 948 245 422 08;
  • 35) 0.204 753 624 360 478 914 534 426 573 074 948 245 422 08 × 2 = 0 + 0.409 507 248 720 957 829 068 853 146 149 896 490 844 16;
  • 36) 0.409 507 248 720 957 829 068 853 146 149 896 490 844 16 × 2 = 0 + 0.819 014 497 441 915 658 137 706 292 299 792 981 688 32;
  • 37) 0.819 014 497 441 915 658 137 706 292 299 792 981 688 32 × 2 = 1 + 0.638 028 994 883 831 316 275 412 584 599 585 963 376 64;
  • 38) 0.638 028 994 883 831 316 275 412 584 599 585 963 376 64 × 2 = 1 + 0.276 057 989 767 662 632 550 825 169 199 171 926 753 28;
  • 39) 0.276 057 989 767 662 632 550 825 169 199 171 926 753 28 × 2 = 0 + 0.552 115 979 535 325 265 101 650 338 398 343 853 506 56;
  • 40) 0.552 115 979 535 325 265 101 650 338 398 343 853 506 56 × 2 = 1 + 0.104 231 959 070 650 530 203 300 676 796 687 707 013 12;
  • 41) 0.104 231 959 070 650 530 203 300 676 796 687 707 013 12 × 2 = 0 + 0.208 463 918 141 301 060 406 601 353 593 375 414 026 24;
  • 42) 0.208 463 918 141 301 060 406 601 353 593 375 414 026 24 × 2 = 0 + 0.416 927 836 282 602 120 813 202 707 186 750 828 052 48;
  • 43) 0.416 927 836 282 602 120 813 202 707 186 750 828 052 48 × 2 = 0 + 0.833 855 672 565 204 241 626 405 414 373 501 656 104 96;
  • 44) 0.833 855 672 565 204 241 626 405 414 373 501 656 104 96 × 2 = 1 + 0.667 711 345 130 408 483 252 810 828 747 003 312 209 92;
  • 45) 0.667 711 345 130 408 483 252 810 828 747 003 312 209 92 × 2 = 1 + 0.335 422 690 260 816 966 505 621 657 494 006 624 419 84;
  • 46) 0.335 422 690 260 816 966 505 621 657 494 006 624 419 84 × 2 = 0 + 0.670 845 380 521 633 933 011 243 314 988 013 248 839 68;
  • 47) 0.670 845 380 521 633 933 011 243 314 988 013 248 839 68 × 2 = 1 + 0.341 690 761 043 267 866 022 486 629 976 026 497 679 36;
  • 48) 0.341 690 761 043 267 866 022 486 629 976 026 497 679 36 × 2 = 0 + 0.683 381 522 086 535 732 044 973 259 952 052 995 358 72;
  • 49) 0.683 381 522 086 535 732 044 973 259 952 052 995 358 72 × 2 = 1 + 0.366 763 044 173 071 464 089 946 519 904 105 990 717 44;
  • 50) 0.366 763 044 173 071 464 089 946 519 904 105 990 717 44 × 2 = 0 + 0.733 526 088 346 142 928 179 893 039 808 211 981 434 88;
  • 51) 0.733 526 088 346 142 928 179 893 039 808 211 981 434 88 × 2 = 1 + 0.467 052 176 692 285 856 359 786 079 616 423 962 869 76;
  • 52) 0.467 052 176 692 285 856 359 786 079 616 423 962 869 76 × 2 = 0 + 0.934 104 353 384 571 712 719 572 159 232 847 925 739 52;
  • 53) 0.934 104 353 384 571 712 719 572 159 232 847 925 739 52 × 2 = 1 + 0.868 208 706 769 143 425 439 144 318 465 695 851 479 04;
  • 54) 0.868 208 706 769 143 425 439 144 318 465 695 851 479 04 × 2 = 1 + 0.736 417 413 538 286 850 878 288 636 931 391 702 958 08;
  • 55) 0.736 417 413 538 286 850 878 288 636 931 391 702 958 08 × 2 = 1 + 0.472 834 827 076 573 701 756 577 273 862 783 405 916 16;
  • 56) 0.472 834 827 076 573 701 756 577 273 862 783 405 916 16 × 2 = 0 + 0.945 669 654 153 147 403 513 154 547 725 566 811 832 32;
  • 57) 0.945 669 654 153 147 403 513 154 547 725 566 811 832 32 × 2 = 1 + 0.891 339 308 306 294 807 026 309 095 451 133 623 664 64;
  • 58) 0.891 339 308 306 294 807 026 309 095 451 133 623 664 64 × 2 = 1 + 0.782 678 616 612 589 614 052 618 190 902 267 247 329 28;
  • 59) 0.782 678 616 612 589 614 052 618 190 902 267 247 329 28 × 2 = 1 + 0.565 357 233 225 179 228 105 236 381 804 534 494 658 56;
  • 60) 0.565 357 233 225 179 228 105 236 381 804 534 494 658 56 × 2 = 1 + 0.130 714 466 450 358 456 210 472 763 609 068 989 317 12;
  • 61) 0.130 714 466 450 358 456 210 472 763 609 068 989 317 12 × 2 = 0 + 0.261 428 932 900 716 912 420 945 527 218 137 978 634 24;
  • 62) 0.261 428 932 900 716 912 420 945 527 218 137 978 634 24 × 2 = 0 + 0.522 857 865 801 433 824 841 891 054 436 275 957 268 48;
  • 63) 0.522 857 865 801 433 824 841 891 054 436 275 957 268 48 × 2 = 1 + 0.045 715 731 602 867 649 683 782 108 872 551 914 536 96;
  • 64) 0.045 715 731 602 867 649 683 782 108 872 551 914 536 96 × 2 = 0 + 0.091 431 463 205 735 299 367 564 217 745 103 829 073 92;
  • 65) 0.091 431 463 205 735 299 367 564 217 745 103 829 073 92 × 2 = 0 + 0.182 862 926 411 470 598 735 128 435 490 207 658 147 84;
  • 66) 0.182 862 926 411 470 598 735 128 435 490 207 658 147 84 × 2 = 0 + 0.365 725 852 822 941 197 470 256 870 980 415 316 295 68;
  • 67) 0.365 725 852 822 941 197 470 256 870 980 415 316 295 68 × 2 = 0 + 0.731 451 705 645 882 394 940 513 741 960 830 632 591 36;
  • 68) 0.731 451 705 645 882 394 940 513 741 960 830 632 591 36 × 2 = 1 + 0.462 903 411 291 764 789 881 027 483 921 661 265 182 72;

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 62(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 62(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 62(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 62 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