0.000 020 830 729 321 671 205 134 999 154 509 661 88 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 0.000 020 830 729 321 671 205 134 999 154 509 661 88(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
0.000 020 830 729 321 671 205 134 999 154 509 661 88(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: 0.000 020 830 729 321 671 205 134 999 154 509 661 88.

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) 0.000 020 830 729 321 671 205 134 999 154 509 661 88 × 2 = 0 + 0.000 041 661 458 643 342 410 269 998 309 019 323 76;
  • 2) 0.000 041 661 458 643 342 410 269 998 309 019 323 76 × 2 = 0 + 0.000 083 322 917 286 684 820 539 996 618 038 647 52;
  • 3) 0.000 083 322 917 286 684 820 539 996 618 038 647 52 × 2 = 0 + 0.000 166 645 834 573 369 641 079 993 236 077 295 04;
  • 4) 0.000 166 645 834 573 369 641 079 993 236 077 295 04 × 2 = 0 + 0.000 333 291 669 146 739 282 159 986 472 154 590 08;
  • 5) 0.000 333 291 669 146 739 282 159 986 472 154 590 08 × 2 = 0 + 0.000 666 583 338 293 478 564 319 972 944 309 180 16;
  • 6) 0.000 666 583 338 293 478 564 319 972 944 309 180 16 × 2 = 0 + 0.001 333 166 676 586 957 128 639 945 888 618 360 32;
  • 7) 0.001 333 166 676 586 957 128 639 945 888 618 360 32 × 2 = 0 + 0.002 666 333 353 173 914 257 279 891 777 236 720 64;
  • 8) 0.002 666 333 353 173 914 257 279 891 777 236 720 64 × 2 = 0 + 0.005 332 666 706 347 828 514 559 783 554 473 441 28;
  • 9) 0.005 332 666 706 347 828 514 559 783 554 473 441 28 × 2 = 0 + 0.010 665 333 412 695 657 029 119 567 108 946 882 56;
  • 10) 0.010 665 333 412 695 657 029 119 567 108 946 882 56 × 2 = 0 + 0.021 330 666 825 391 314 058 239 134 217 893 765 12;
  • 11) 0.021 330 666 825 391 314 058 239 134 217 893 765 12 × 2 = 0 + 0.042 661 333 650 782 628 116 478 268 435 787 530 24;
  • 12) 0.042 661 333 650 782 628 116 478 268 435 787 530 24 × 2 = 0 + 0.085 322 667 301 565 256 232 956 536 871 575 060 48;
  • 13) 0.085 322 667 301 565 256 232 956 536 871 575 060 48 × 2 = 0 + 0.170 645 334 603 130 512 465 913 073 743 150 120 96;
  • 14) 0.170 645 334 603 130 512 465 913 073 743 150 120 96 × 2 = 0 + 0.341 290 669 206 261 024 931 826 147 486 300 241 92;
  • 15) 0.341 290 669 206 261 024 931 826 147 486 300 241 92 × 2 = 0 + 0.682 581 338 412 522 049 863 652 294 972 600 483 84;
  • 16) 0.682 581 338 412 522 049 863 652 294 972 600 483 84 × 2 = 1 + 0.365 162 676 825 044 099 727 304 589 945 200 967 68;
  • 17) 0.365 162 676 825 044 099 727 304 589 945 200 967 68 × 2 = 0 + 0.730 325 353 650 088 199 454 609 179 890 401 935 36;
  • 18) 0.730 325 353 650 088 199 454 609 179 890 401 935 36 × 2 = 1 + 0.460 650 707 300 176 398 909 218 359 780 803 870 72;
  • 19) 0.460 650 707 300 176 398 909 218 359 780 803 870 72 × 2 = 0 + 0.921 301 414 600 352 797 818 436 719 561 607 741 44;
  • 20) 0.921 301 414 600 352 797 818 436 719 561 607 741 44 × 2 = 1 + 0.842 602 829 200 705 595 636 873 439 123 215 482 88;
  • 21) 0.842 602 829 200 705 595 636 873 439 123 215 482 88 × 2 = 1 + 0.685 205 658 401 411 191 273 746 878 246 430 965 76;
  • 22) 0.685 205 658 401 411 191 273 746 878 246 430 965 76 × 2 = 1 + 0.370 411 316 802 822 382 547 493 756 492 861 931 52;
  • 23) 0.370 411 316 802 822 382 547 493 756 492 861 931 52 × 2 = 0 + 0.740 822 633 605 644 765 094 987 512 985 723 863 04;
  • 24) 0.740 822 633 605 644 765 094 987 512 985 723 863 04 × 2 = 1 + 0.481 645 267 211 289 530 189 975 025 971 447 726 08;
  • 25) 0.481 645 267 211 289 530 189 975 025 971 447 726 08 × 2 = 0 + 0.963 290 534 422 579 060 379 950 051 942 895 452 16;
  • 26) 0.963 290 534 422 579 060 379 950 051 942 895 452 16 × 2 = 1 + 0.926 581 068 845 158 120 759 900 103 885 790 904 32;
  • 27) 0.926 581 068 845 158 120 759 900 103 885 790 904 32 × 2 = 1 + 0.853 162 137 690 316 241 519 800 207 771 581 808 64;
  • 28) 0.853 162 137 690 316 241 519 800 207 771 581 808 64 × 2 = 1 + 0.706 324 275 380 632 483 039 600 415 543 163 617 28;
  • 29) 0.706 324 275 380 632 483 039 600 415 543 163 617 28 × 2 = 1 + 0.412 648 550 761 264 966 079 200 831 086 327 234 56;
  • 30) 0.412 648 550 761 264 966 079 200 831 086 327 234 56 × 2 = 0 + 0.825 297 101 522 529 932 158 401 662 172 654 469 12;
  • 31) 0.825 297 101 522 529 932 158 401 662 172 654 469 12 × 2 = 1 + 0.650 594 203 045 059 864 316 803 324 345 308 938 24;
  • 32) 0.650 594 203 045 059 864 316 803 324 345 308 938 24 × 2 = 1 + 0.301 188 406 090 119 728 633 606 648 690 617 876 48;
  • 33) 0.301 188 406 090 119 728 633 606 648 690 617 876 48 × 2 = 0 + 0.602 376 812 180 239 457 267 213 297 381 235 752 96;
  • 34) 0.602 376 812 180 239 457 267 213 297 381 235 752 96 × 2 = 1 + 0.204 753 624 360 478 914 534 426 594 762 471 505 92;
  • 35) 0.204 753 624 360 478 914 534 426 594 762 471 505 92 × 2 = 0 + 0.409 507 248 720 957 829 068 853 189 524 943 011 84;
  • 36) 0.409 507 248 720 957 829 068 853 189 524 943 011 84 × 2 = 0 + 0.819 014 497 441 915 658 137 706 379 049 886 023 68;
  • 37) 0.819 014 497 441 915 658 137 706 379 049 886 023 68 × 2 = 1 + 0.638 028 994 883 831 316 275 412 758 099 772 047 36;
  • 38) 0.638 028 994 883 831 316 275 412 758 099 772 047 36 × 2 = 1 + 0.276 057 989 767 662 632 550 825 516 199 544 094 72;
  • 39) 0.276 057 989 767 662 632 550 825 516 199 544 094 72 × 2 = 0 + 0.552 115 979 535 325 265 101 651 032 399 088 189 44;
  • 40) 0.552 115 979 535 325 265 101 651 032 399 088 189 44 × 2 = 1 + 0.104 231 959 070 650 530 203 302 064 798 176 378 88;
  • 41) 0.104 231 959 070 650 530 203 302 064 798 176 378 88 × 2 = 0 + 0.208 463 918 141 301 060 406 604 129 596 352 757 76;
  • 42) 0.208 463 918 141 301 060 406 604 129 596 352 757 76 × 2 = 0 + 0.416 927 836 282 602 120 813 208 259 192 705 515 52;
  • 43) 0.416 927 836 282 602 120 813 208 259 192 705 515 52 × 2 = 0 + 0.833 855 672 565 204 241 626 416 518 385 411 031 04;
  • 44) 0.833 855 672 565 204 241 626 416 518 385 411 031 04 × 2 = 1 + 0.667 711 345 130 408 483 252 833 036 770 822 062 08;
  • 45) 0.667 711 345 130 408 483 252 833 036 770 822 062 08 × 2 = 1 + 0.335 422 690 260 816 966 505 666 073 541 644 124 16;
  • 46) 0.335 422 690 260 816 966 505 666 073 541 644 124 16 × 2 = 0 + 0.670 845 380 521 633 933 011 332 147 083 288 248 32;
  • 47) 0.670 845 380 521 633 933 011 332 147 083 288 248 32 × 2 = 1 + 0.341 690 761 043 267 866 022 664 294 166 576 496 64;
  • 48) 0.341 690 761 043 267 866 022 664 294 166 576 496 64 × 2 = 0 + 0.683 381 522 086 535 732 045 328 588 333 152 993 28;
  • 49) 0.683 381 522 086 535 732 045 328 588 333 152 993 28 × 2 = 1 + 0.366 763 044 173 071 464 090 657 176 666 305 986 56;
  • 50) 0.366 763 044 173 071 464 090 657 176 666 305 986 56 × 2 = 0 + 0.733 526 088 346 142 928 181 314 353 332 611 973 12;
  • 51) 0.733 526 088 346 142 928 181 314 353 332 611 973 12 × 2 = 1 + 0.467 052 176 692 285 856 362 628 706 665 223 946 24;
  • 52) 0.467 052 176 692 285 856 362 628 706 665 223 946 24 × 2 = 0 + 0.934 104 353 384 571 712 725 257 413 330 447 892 48;
  • 53) 0.934 104 353 384 571 712 725 257 413 330 447 892 48 × 2 = 1 + 0.868 208 706 769 143 425 450 514 826 660 895 784 96;
  • 54) 0.868 208 706 769 143 425 450 514 826 660 895 784 96 × 2 = 1 + 0.736 417 413 538 286 850 901 029 653 321 791 569 92;
  • 55) 0.736 417 413 538 286 850 901 029 653 321 791 569 92 × 2 = 1 + 0.472 834 827 076 573 701 802 059 306 643 583 139 84;
  • 56) 0.472 834 827 076 573 701 802 059 306 643 583 139 84 × 2 = 0 + 0.945 669 654 153 147 403 604 118 613 287 166 279 68;
  • 57) 0.945 669 654 153 147 403 604 118 613 287 166 279 68 × 2 = 1 + 0.891 339 308 306 294 807 208 237 226 574 332 559 36;
  • 58) 0.891 339 308 306 294 807 208 237 226 574 332 559 36 × 2 = 1 + 0.782 678 616 612 589 614 416 474 453 148 665 118 72;
  • 59) 0.782 678 616 612 589 614 416 474 453 148 665 118 72 × 2 = 1 + 0.565 357 233 225 179 228 832 948 906 297 330 237 44;
  • 60) 0.565 357 233 225 179 228 832 948 906 297 330 237 44 × 2 = 1 + 0.130 714 466 450 358 457 665 897 812 594 660 474 88;
  • 61) 0.130 714 466 450 358 457 665 897 812 594 660 474 88 × 2 = 0 + 0.261 428 932 900 716 915 331 795 625 189 320 949 76;
  • 62) 0.261 428 932 900 716 915 331 795 625 189 320 949 76 × 2 = 0 + 0.522 857 865 801 433 830 663 591 250 378 641 899 52;
  • 63) 0.522 857 865 801 433 830 663 591 250 378 641 899 52 × 2 = 1 + 0.045 715 731 602 867 661 327 182 500 757 283 799 04;
  • 64) 0.045 715 731 602 867 661 327 182 500 757 283 799 04 × 2 = 0 + 0.091 431 463 205 735 322 654 365 001 514 567 598 08;
  • 65) 0.091 431 463 205 735 322 654 365 001 514 567 598 08 × 2 = 0 + 0.182 862 926 411 470 645 308 730 003 029 135 196 16;
  • 66) 0.182 862 926 411 470 645 308 730 003 029 135 196 16 × 2 = 0 + 0.365 725 852 822 941 290 617 460 006 058 270 392 32;
  • 67) 0.365 725 852 822 941 290 617 460 006 058 270 392 32 × 2 = 0 + 0.731 451 705 645 882 581 234 920 012 116 540 784 64;
  • 68) 0.731 451 705 645 882 581 234 920 012 116 540 784 64 × 2 = 1 + 0.462 903 411 291 765 162 469 840 024 233 081 569 28;

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:


0.000 020 830 729 321 671 205 134 999 154 509 661 88(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:

0.000 020 830 729 321 671 205 134 999 154 509 661 88(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:


0.000 020 830 729 321 671 205 134 999 154 509 661 88(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 0.000 020 830 729 321 671 205 134 999 154 509 661 88 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