0.000 020 830 729 321 671 205 134 999 154 509 660 616 864 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 0.000 020 830 729 321 671 205 134 999 154 509 660 616 864(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
0.000 020 830 729 321 671 205 134 999 154 509 660 616 864(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: 0.000 020 830 729 321 671 205 134 999 154 509 660 616 864.

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) 0.000 020 830 729 321 671 205 134 999 154 509 660 616 864 × 2 = 0 + 0.000 041 661 458 643 342 410 269 998 309 019 321 233 728;
  • 2) 0.000 041 661 458 643 342 410 269 998 309 019 321 233 728 × 2 = 0 + 0.000 083 322 917 286 684 820 539 996 618 038 642 467 456;
  • 3) 0.000 083 322 917 286 684 820 539 996 618 038 642 467 456 × 2 = 0 + 0.000 166 645 834 573 369 641 079 993 236 077 284 934 912;
  • 4) 0.000 166 645 834 573 369 641 079 993 236 077 284 934 912 × 2 = 0 + 0.000 333 291 669 146 739 282 159 986 472 154 569 869 824;
  • 5) 0.000 333 291 669 146 739 282 159 986 472 154 569 869 824 × 2 = 0 + 0.000 666 583 338 293 478 564 319 972 944 309 139 739 648;
  • 6) 0.000 666 583 338 293 478 564 319 972 944 309 139 739 648 × 2 = 0 + 0.001 333 166 676 586 957 128 639 945 888 618 279 479 296;
  • 7) 0.001 333 166 676 586 957 128 639 945 888 618 279 479 296 × 2 = 0 + 0.002 666 333 353 173 914 257 279 891 777 236 558 958 592;
  • 8) 0.002 666 333 353 173 914 257 279 891 777 236 558 958 592 × 2 = 0 + 0.005 332 666 706 347 828 514 559 783 554 473 117 917 184;
  • 9) 0.005 332 666 706 347 828 514 559 783 554 473 117 917 184 × 2 = 0 + 0.010 665 333 412 695 657 029 119 567 108 946 235 834 368;
  • 10) 0.010 665 333 412 695 657 029 119 567 108 946 235 834 368 × 2 = 0 + 0.021 330 666 825 391 314 058 239 134 217 892 471 668 736;
  • 11) 0.021 330 666 825 391 314 058 239 134 217 892 471 668 736 × 2 = 0 + 0.042 661 333 650 782 628 116 478 268 435 784 943 337 472;
  • 12) 0.042 661 333 650 782 628 116 478 268 435 784 943 337 472 × 2 = 0 + 0.085 322 667 301 565 256 232 956 536 871 569 886 674 944;
  • 13) 0.085 322 667 301 565 256 232 956 536 871 569 886 674 944 × 2 = 0 + 0.170 645 334 603 130 512 465 913 073 743 139 773 349 888;
  • 14) 0.170 645 334 603 130 512 465 913 073 743 139 773 349 888 × 2 = 0 + 0.341 290 669 206 261 024 931 826 147 486 279 546 699 776;
  • 15) 0.341 290 669 206 261 024 931 826 147 486 279 546 699 776 × 2 = 0 + 0.682 581 338 412 522 049 863 652 294 972 559 093 399 552;
  • 16) 0.682 581 338 412 522 049 863 652 294 972 559 093 399 552 × 2 = 1 + 0.365 162 676 825 044 099 727 304 589 945 118 186 799 104;
  • 17) 0.365 162 676 825 044 099 727 304 589 945 118 186 799 104 × 2 = 0 + 0.730 325 353 650 088 199 454 609 179 890 236 373 598 208;
  • 18) 0.730 325 353 650 088 199 454 609 179 890 236 373 598 208 × 2 = 1 + 0.460 650 707 300 176 398 909 218 359 780 472 747 196 416;
  • 19) 0.460 650 707 300 176 398 909 218 359 780 472 747 196 416 × 2 = 0 + 0.921 301 414 600 352 797 818 436 719 560 945 494 392 832;
  • 20) 0.921 301 414 600 352 797 818 436 719 560 945 494 392 832 × 2 = 1 + 0.842 602 829 200 705 595 636 873 439 121 890 988 785 664;
  • 21) 0.842 602 829 200 705 595 636 873 439 121 890 988 785 664 × 2 = 1 + 0.685 205 658 401 411 191 273 746 878 243 781 977 571 328;
  • 22) 0.685 205 658 401 411 191 273 746 878 243 781 977 571 328 × 2 = 1 + 0.370 411 316 802 822 382 547 493 756 487 563 955 142 656;
  • 23) 0.370 411 316 802 822 382 547 493 756 487 563 955 142 656 × 2 = 0 + 0.740 822 633 605 644 765 094 987 512 975 127 910 285 312;
  • 24) 0.740 822 633 605 644 765 094 987 512 975 127 910 285 312 × 2 = 1 + 0.481 645 267 211 289 530 189 975 025 950 255 820 570 624;
  • 25) 0.481 645 267 211 289 530 189 975 025 950 255 820 570 624 × 2 = 0 + 0.963 290 534 422 579 060 379 950 051 900 511 641 141 248;
  • 26) 0.963 290 534 422 579 060 379 950 051 900 511 641 141 248 × 2 = 1 + 0.926 581 068 845 158 120 759 900 103 801 023 282 282 496;
  • 27) 0.926 581 068 845 158 120 759 900 103 801 023 282 282 496 × 2 = 1 + 0.853 162 137 690 316 241 519 800 207 602 046 564 564 992;
  • 28) 0.853 162 137 690 316 241 519 800 207 602 046 564 564 992 × 2 = 1 + 0.706 324 275 380 632 483 039 600 415 204 093 129 129 984;
  • 29) 0.706 324 275 380 632 483 039 600 415 204 093 129 129 984 × 2 = 1 + 0.412 648 550 761 264 966 079 200 830 408 186 258 259 968;
  • 30) 0.412 648 550 761 264 966 079 200 830 408 186 258 259 968 × 2 = 0 + 0.825 297 101 522 529 932 158 401 660 816 372 516 519 936;
  • 31) 0.825 297 101 522 529 932 158 401 660 816 372 516 519 936 × 2 = 1 + 0.650 594 203 045 059 864 316 803 321 632 745 033 039 872;
  • 32) 0.650 594 203 045 059 864 316 803 321 632 745 033 039 872 × 2 = 1 + 0.301 188 406 090 119 728 633 606 643 265 490 066 079 744;
  • 33) 0.301 188 406 090 119 728 633 606 643 265 490 066 079 744 × 2 = 0 + 0.602 376 812 180 239 457 267 213 286 530 980 132 159 488;
  • 34) 0.602 376 812 180 239 457 267 213 286 530 980 132 159 488 × 2 = 1 + 0.204 753 624 360 478 914 534 426 573 061 960 264 318 976;
  • 35) 0.204 753 624 360 478 914 534 426 573 061 960 264 318 976 × 2 = 0 + 0.409 507 248 720 957 829 068 853 146 123 920 528 637 952;
  • 36) 0.409 507 248 720 957 829 068 853 146 123 920 528 637 952 × 2 = 0 + 0.819 014 497 441 915 658 137 706 292 247 841 057 275 904;
  • 37) 0.819 014 497 441 915 658 137 706 292 247 841 057 275 904 × 2 = 1 + 0.638 028 994 883 831 316 275 412 584 495 682 114 551 808;
  • 38) 0.638 028 994 883 831 316 275 412 584 495 682 114 551 808 × 2 = 1 + 0.276 057 989 767 662 632 550 825 168 991 364 229 103 616;
  • 39) 0.276 057 989 767 662 632 550 825 168 991 364 229 103 616 × 2 = 0 + 0.552 115 979 535 325 265 101 650 337 982 728 458 207 232;
  • 40) 0.552 115 979 535 325 265 101 650 337 982 728 458 207 232 × 2 = 1 + 0.104 231 959 070 650 530 203 300 675 965 456 916 414 464;
  • 41) 0.104 231 959 070 650 530 203 300 675 965 456 916 414 464 × 2 = 0 + 0.208 463 918 141 301 060 406 601 351 930 913 832 828 928;
  • 42) 0.208 463 918 141 301 060 406 601 351 930 913 832 828 928 × 2 = 0 + 0.416 927 836 282 602 120 813 202 703 861 827 665 657 856;
  • 43) 0.416 927 836 282 602 120 813 202 703 861 827 665 657 856 × 2 = 0 + 0.833 855 672 565 204 241 626 405 407 723 655 331 315 712;
  • 44) 0.833 855 672 565 204 241 626 405 407 723 655 331 315 712 × 2 = 1 + 0.667 711 345 130 408 483 252 810 815 447 310 662 631 424;
  • 45) 0.667 711 345 130 408 483 252 810 815 447 310 662 631 424 × 2 = 1 + 0.335 422 690 260 816 966 505 621 630 894 621 325 262 848;
  • 46) 0.335 422 690 260 816 966 505 621 630 894 621 325 262 848 × 2 = 0 + 0.670 845 380 521 633 933 011 243 261 789 242 650 525 696;
  • 47) 0.670 845 380 521 633 933 011 243 261 789 242 650 525 696 × 2 = 1 + 0.341 690 761 043 267 866 022 486 523 578 485 301 051 392;
  • 48) 0.341 690 761 043 267 866 022 486 523 578 485 301 051 392 × 2 = 0 + 0.683 381 522 086 535 732 044 973 047 156 970 602 102 784;
  • 49) 0.683 381 522 086 535 732 044 973 047 156 970 602 102 784 × 2 = 1 + 0.366 763 044 173 071 464 089 946 094 313 941 204 205 568;
  • 50) 0.366 763 044 173 071 464 089 946 094 313 941 204 205 568 × 2 = 0 + 0.733 526 088 346 142 928 179 892 188 627 882 408 411 136;
  • 51) 0.733 526 088 346 142 928 179 892 188 627 882 408 411 136 × 2 = 1 + 0.467 052 176 692 285 856 359 784 377 255 764 816 822 272;
  • 52) 0.467 052 176 692 285 856 359 784 377 255 764 816 822 272 × 2 = 0 + 0.934 104 353 384 571 712 719 568 754 511 529 633 644 544;
  • 53) 0.934 104 353 384 571 712 719 568 754 511 529 633 644 544 × 2 = 1 + 0.868 208 706 769 143 425 439 137 509 023 059 267 289 088;
  • 54) 0.868 208 706 769 143 425 439 137 509 023 059 267 289 088 × 2 = 1 + 0.736 417 413 538 286 850 878 275 018 046 118 534 578 176;
  • 55) 0.736 417 413 538 286 850 878 275 018 046 118 534 578 176 × 2 = 1 + 0.472 834 827 076 573 701 756 550 036 092 237 069 156 352;
  • 56) 0.472 834 827 076 573 701 756 550 036 092 237 069 156 352 × 2 = 0 + 0.945 669 654 153 147 403 513 100 072 184 474 138 312 704;
  • 57) 0.945 669 654 153 147 403 513 100 072 184 474 138 312 704 × 2 = 1 + 0.891 339 308 306 294 807 026 200 144 368 948 276 625 408;
  • 58) 0.891 339 308 306 294 807 026 200 144 368 948 276 625 408 × 2 = 1 + 0.782 678 616 612 589 614 052 400 288 737 896 553 250 816;
  • 59) 0.782 678 616 612 589 614 052 400 288 737 896 553 250 816 × 2 = 1 + 0.565 357 233 225 179 228 104 800 577 475 793 106 501 632;
  • 60) 0.565 357 233 225 179 228 104 800 577 475 793 106 501 632 × 2 = 1 + 0.130 714 466 450 358 456 209 601 154 951 586 213 003 264;
  • 61) 0.130 714 466 450 358 456 209 601 154 951 586 213 003 264 × 2 = 0 + 0.261 428 932 900 716 912 419 202 309 903 172 426 006 528;
  • 62) 0.261 428 932 900 716 912 419 202 309 903 172 426 006 528 × 2 = 0 + 0.522 857 865 801 433 824 838 404 619 806 344 852 013 056;
  • 63) 0.522 857 865 801 433 824 838 404 619 806 344 852 013 056 × 2 = 1 + 0.045 715 731 602 867 649 676 809 239 612 689 704 026 112;
  • 64) 0.045 715 731 602 867 649 676 809 239 612 689 704 026 112 × 2 = 0 + 0.091 431 463 205 735 299 353 618 479 225 379 408 052 224;
  • 65) 0.091 431 463 205 735 299 353 618 479 225 379 408 052 224 × 2 = 0 + 0.182 862 926 411 470 598 707 236 958 450 758 816 104 448;
  • 66) 0.182 862 926 411 470 598 707 236 958 450 758 816 104 448 × 2 = 0 + 0.365 725 852 822 941 197 414 473 916 901 517 632 208 896;
  • 67) 0.365 725 852 822 941 197 414 473 916 901 517 632 208 896 × 2 = 0 + 0.731 451 705 645 882 394 828 947 833 803 035 264 417 792;
  • 68) 0.731 451 705 645 882 394 828 947 833 803 035 264 417 792 × 2 = 1 + 0.462 903 411 291 764 789 657 895 667 606 070 528 835 584;

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:


0.000 020 830 729 321 671 205 134 999 154 509 660 616 864(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:

0.000 020 830 729 321 671 205 134 999 154 509 660 616 864(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:


0.000 020 830 729 321 671 205 134 999 154 509 660 616 864(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 0.000 020 830 729 321 671 205 134 999 154 509 660 616 864 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