-0.000 806 264 623 585 362 514 063 654 156 856 104 965 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal -0.000 806 264 623 585 362 514 063 654 156 856 104 965(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
-0.000 806 264 623 585 362 514 063 654 156 856 104 965(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. Start with the positive version of the number:

|-0.000 806 264 623 585 362 514 063 654 156 856 104 965| = 0.000 806 264 623 585 362 514 063 654 156 856 104 965


2. 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;

3. 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)


4. Convert to binary (base 2) the fractional part: 0.000 806 264 623 585 362 514 063 654 156 856 104 965.

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) 0.000 806 264 623 585 362 514 063 654 156 856 104 965 × 2 = 0 + 0.001 612 529 247 170 725 028 127 308 313 712 209 93;
  • 2) 0.001 612 529 247 170 725 028 127 308 313 712 209 93 × 2 = 0 + 0.003 225 058 494 341 450 056 254 616 627 424 419 86;
  • 3) 0.003 225 058 494 341 450 056 254 616 627 424 419 86 × 2 = 0 + 0.006 450 116 988 682 900 112 509 233 254 848 839 72;
  • 4) 0.006 450 116 988 682 900 112 509 233 254 848 839 72 × 2 = 0 + 0.012 900 233 977 365 800 225 018 466 509 697 679 44;
  • 5) 0.012 900 233 977 365 800 225 018 466 509 697 679 44 × 2 = 0 + 0.025 800 467 954 731 600 450 036 933 019 395 358 88;
  • 6) 0.025 800 467 954 731 600 450 036 933 019 395 358 88 × 2 = 0 + 0.051 600 935 909 463 200 900 073 866 038 790 717 76;
  • 7) 0.051 600 935 909 463 200 900 073 866 038 790 717 76 × 2 = 0 + 0.103 201 871 818 926 401 800 147 732 077 581 435 52;
  • 8) 0.103 201 871 818 926 401 800 147 732 077 581 435 52 × 2 = 0 + 0.206 403 743 637 852 803 600 295 464 155 162 871 04;
  • 9) 0.206 403 743 637 852 803 600 295 464 155 162 871 04 × 2 = 0 + 0.412 807 487 275 705 607 200 590 928 310 325 742 08;
  • 10) 0.412 807 487 275 705 607 200 590 928 310 325 742 08 × 2 = 0 + 0.825 614 974 551 411 214 401 181 856 620 651 484 16;
  • 11) 0.825 614 974 551 411 214 401 181 856 620 651 484 16 × 2 = 1 + 0.651 229 949 102 822 428 802 363 713 241 302 968 32;
  • 12) 0.651 229 949 102 822 428 802 363 713 241 302 968 32 × 2 = 1 + 0.302 459 898 205 644 857 604 727 426 482 605 936 64;
  • 13) 0.302 459 898 205 644 857 604 727 426 482 605 936 64 × 2 = 0 + 0.604 919 796 411 289 715 209 454 852 965 211 873 28;
  • 14) 0.604 919 796 411 289 715 209 454 852 965 211 873 28 × 2 = 1 + 0.209 839 592 822 579 430 418 909 705 930 423 746 56;
  • 15) 0.209 839 592 822 579 430 418 909 705 930 423 746 56 × 2 = 0 + 0.419 679 185 645 158 860 837 819 411 860 847 493 12;
  • 16) 0.419 679 185 645 158 860 837 819 411 860 847 493 12 × 2 = 0 + 0.839 358 371 290 317 721 675 638 823 721 694 986 24;
  • 17) 0.839 358 371 290 317 721 675 638 823 721 694 986 24 × 2 = 1 + 0.678 716 742 580 635 443 351 277 647 443 389 972 48;
  • 18) 0.678 716 742 580 635 443 351 277 647 443 389 972 48 × 2 = 1 + 0.357 433 485 161 270 886 702 555 294 886 779 944 96;
  • 19) 0.357 433 485 161 270 886 702 555 294 886 779 944 96 × 2 = 0 + 0.714 866 970 322 541 773 405 110 589 773 559 889 92;
  • 20) 0.714 866 970 322 541 773 405 110 589 773 559 889 92 × 2 = 1 + 0.429 733 940 645 083 546 810 221 179 547 119 779 84;
  • 21) 0.429 733 940 645 083 546 810 221 179 547 119 779 84 × 2 = 0 + 0.859 467 881 290 167 093 620 442 359 094 239 559 68;
  • 22) 0.859 467 881 290 167 093 620 442 359 094 239 559 68 × 2 = 1 + 0.718 935 762 580 334 187 240 884 718 188 479 119 36;
  • 23) 0.718 935 762 580 334 187 240 884 718 188 479 119 36 × 2 = 1 + 0.437 871 525 160 668 374 481 769 436 376 958 238 72;
  • 24) 0.437 871 525 160 668 374 481 769 436 376 958 238 72 × 2 = 0 + 0.875 743 050 321 336 748 963 538 872 753 916 477 44;
  • 25) 0.875 743 050 321 336 748 963 538 872 753 916 477 44 × 2 = 1 + 0.751 486 100 642 673 497 927 077 745 507 832 954 88;
  • 26) 0.751 486 100 642 673 497 927 077 745 507 832 954 88 × 2 = 1 + 0.502 972 201 285 346 995 854 155 491 015 665 909 76;
  • 27) 0.502 972 201 285 346 995 854 155 491 015 665 909 76 × 2 = 1 + 0.005 944 402 570 693 991 708 310 982 031 331 819 52;
  • 28) 0.005 944 402 570 693 991 708 310 982 031 331 819 52 × 2 = 0 + 0.011 888 805 141 387 983 416 621 964 062 663 639 04;
  • 29) 0.011 888 805 141 387 983 416 621 964 062 663 639 04 × 2 = 0 + 0.023 777 610 282 775 966 833 243 928 125 327 278 08;
  • 30) 0.023 777 610 282 775 966 833 243 928 125 327 278 08 × 2 = 0 + 0.047 555 220 565 551 933 666 487 856 250 654 556 16;
  • 31) 0.047 555 220 565 551 933 666 487 856 250 654 556 16 × 2 = 0 + 0.095 110 441 131 103 867 332 975 712 501 309 112 32;
  • 32) 0.095 110 441 131 103 867 332 975 712 501 309 112 32 × 2 = 0 + 0.190 220 882 262 207 734 665 951 425 002 618 224 64;
  • 33) 0.190 220 882 262 207 734 665 951 425 002 618 224 64 × 2 = 0 + 0.380 441 764 524 415 469 331 902 850 005 236 449 28;
  • 34) 0.380 441 764 524 415 469 331 902 850 005 236 449 28 × 2 = 0 + 0.760 883 529 048 830 938 663 805 700 010 472 898 56;
  • 35) 0.760 883 529 048 830 938 663 805 700 010 472 898 56 × 2 = 1 + 0.521 767 058 097 661 877 327 611 400 020 945 797 12;
  • 36) 0.521 767 058 097 661 877 327 611 400 020 945 797 12 × 2 = 1 + 0.043 534 116 195 323 754 655 222 800 041 891 594 24;
  • 37) 0.043 534 116 195 323 754 655 222 800 041 891 594 24 × 2 = 0 + 0.087 068 232 390 647 509 310 445 600 083 783 188 48;
  • 38) 0.087 068 232 390 647 509 310 445 600 083 783 188 48 × 2 = 0 + 0.174 136 464 781 295 018 620 891 200 167 566 376 96;
  • 39) 0.174 136 464 781 295 018 620 891 200 167 566 376 96 × 2 = 0 + 0.348 272 929 562 590 037 241 782 400 335 132 753 92;
  • 40) 0.348 272 929 562 590 037 241 782 400 335 132 753 92 × 2 = 0 + 0.696 545 859 125 180 074 483 564 800 670 265 507 84;
  • 41) 0.696 545 859 125 180 074 483 564 800 670 265 507 84 × 2 = 1 + 0.393 091 718 250 360 148 967 129 601 340 531 015 68;
  • 42) 0.393 091 718 250 360 148 967 129 601 340 531 015 68 × 2 = 0 + 0.786 183 436 500 720 297 934 259 202 681 062 031 36;
  • 43) 0.786 183 436 500 720 297 934 259 202 681 062 031 36 × 2 = 1 + 0.572 366 873 001 440 595 868 518 405 362 124 062 72;
  • 44) 0.572 366 873 001 440 595 868 518 405 362 124 062 72 × 2 = 1 + 0.144 733 746 002 881 191 737 036 810 724 248 125 44;
  • 45) 0.144 733 746 002 881 191 737 036 810 724 248 125 44 × 2 = 0 + 0.289 467 492 005 762 383 474 073 621 448 496 250 88;
  • 46) 0.289 467 492 005 762 383 474 073 621 448 496 250 88 × 2 = 0 + 0.578 934 984 011 524 766 948 147 242 896 992 501 76;
  • 47) 0.578 934 984 011 524 766 948 147 242 896 992 501 76 × 2 = 1 + 0.157 869 968 023 049 533 896 294 485 793 985 003 52;
  • 48) 0.157 869 968 023 049 533 896 294 485 793 985 003 52 × 2 = 0 + 0.315 739 936 046 099 067 792 588 971 587 970 007 04;
  • 49) 0.315 739 936 046 099 067 792 588 971 587 970 007 04 × 2 = 0 + 0.631 479 872 092 198 135 585 177 943 175 940 014 08;
  • 50) 0.631 479 872 092 198 135 585 177 943 175 940 014 08 × 2 = 1 + 0.262 959 744 184 396 271 170 355 886 351 880 028 16;
  • 51) 0.262 959 744 184 396 271 170 355 886 351 880 028 16 × 2 = 0 + 0.525 919 488 368 792 542 340 711 772 703 760 056 32;
  • 52) 0.525 919 488 368 792 542 340 711 772 703 760 056 32 × 2 = 1 + 0.051 838 976 737 585 084 681 423 545 407 520 112 64;
  • 53) 0.051 838 976 737 585 084 681 423 545 407 520 112 64 × 2 = 0 + 0.103 677 953 475 170 169 362 847 090 815 040 225 28;
  • 54) 0.103 677 953 475 170 169 362 847 090 815 040 225 28 × 2 = 0 + 0.207 355 906 950 340 338 725 694 181 630 080 450 56;
  • 55) 0.207 355 906 950 340 338 725 694 181 630 080 450 56 × 2 = 0 + 0.414 711 813 900 680 677 451 388 363 260 160 901 12;
  • 56) 0.414 711 813 900 680 677 451 388 363 260 160 901 12 × 2 = 0 + 0.829 423 627 801 361 354 902 776 726 520 321 802 24;
  • 57) 0.829 423 627 801 361 354 902 776 726 520 321 802 24 × 2 = 1 + 0.658 847 255 602 722 709 805 553 453 040 643 604 48;
  • 58) 0.658 847 255 602 722 709 805 553 453 040 643 604 48 × 2 = 1 + 0.317 694 511 205 445 419 611 106 906 081 287 208 96;
  • 59) 0.317 694 511 205 445 419 611 106 906 081 287 208 96 × 2 = 0 + 0.635 389 022 410 890 839 222 213 812 162 574 417 92;
  • 60) 0.635 389 022 410 890 839 222 213 812 162 574 417 92 × 2 = 1 + 0.270 778 044 821 781 678 444 427 624 325 148 835 84;
  • 61) 0.270 778 044 821 781 678 444 427 624 325 148 835 84 × 2 = 0 + 0.541 556 089 643 563 356 888 855 248 650 297 671 68;
  • 62) 0.541 556 089 643 563 356 888 855 248 650 297 671 68 × 2 = 1 + 0.083 112 179 287 126 713 777 710 497 300 595 343 36;
  • 63) 0.083 112 179 287 126 713 777 710 497 300 595 343 36 × 2 = 0 + 0.166 224 358 574 253 427 555 420 994 601 190 686 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).


5. 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:


0.000 806 264 623 585 362 514 063 654 156 856 104 965(10) =

0.0000 0000 0011 0100 1101 0110 1110 0000 0011 0000 1011 0010 0101 0000 1101 010(2)

6. Positive number before normalization:

0.000 806 264 623 585 362 514 063 654 156 856 104 965(10) =

0.0000 0000 0011 0100 1101 0110 1110 0000 0011 0000 1011 0010 0101 0000 1101 010(2)

7. Normalize the binary representation of the number.

Shift the decimal mark 11 positions to the right, so that only one non zero digit remains to the left of it:


0.000 806 264 623 585 362 514 063 654 156 856 104 965(10) =

0.0000 0000 0011 0100 1101 0110 1110 0000 0011 0000 1011 0010 0101 0000 1101 010(2) =

0.0000 0000 0011 0100 1101 0110 1110 0000 0011 0000 1011 0010 0101 0000 1101 010(2) × 20 =

1.1010 0110 1011 0111 0000 0001 1000 0101 1001 0010 1000 0110 1010(2) × 2-11


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): -11

Mantissa (not normalized):
1.1010 0110 1011 0111 0000 0001 1000 0101 1001 0010 1000 0110 1010


9. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

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

(-11 + 1 023)(10) =

1 012(10)


10. 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;
  • 1 012 ÷ 2 = 506 + 0;
  • 506 ÷ 2 = 253 + 0;
  • 253 ÷ 2 = 126 + 1;
  • 126 ÷ 2 = 63 + 0;
  • 63 ÷ 2 = 31 + 1;
  • 31 ÷ 2 = 15 + 1;
  • 15 ÷ 2 = 7 + 1;
  • 7 ÷ 2 = 3 + 1;
  • 3 ÷ 2 = 1 + 1;
  • 1 ÷ 2 = 0 + 1;

11. Construct the base 2 representation of the adjusted exponent.

Take all the remainders starting from the bottom of the list constructed above.


Exponent (adjusted) =

1012(10) =

011 1111 0100(2)


12. 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. 1010 0110 1011 0111 0000 0001 1000 0101 1001 0010 1000 0110 1010 =

1010 0110 1011 0111 0000 0001 1000 0101 1001 0010 1000 0110 1010


13. The three elements that make up the number's 64 bit double precision IEEE 754 binary floating point representation:

Sign (1 bit) =
1 (a negative number)

Exponent (11 bits) =
011 1111 0100

Mantissa (52 bits) =
1010 0110 1011 0111 0000 0001 1000 0101 1001 0010 1000 0110 1010


Decimal number -0.000 806 264 623 585 362 514 063 654 156 856 104 965 converted to 64 bit double precision IEEE 754 binary floating point representation:

1 - 011 1111 0100 - 1010 0110 1011 0111 0000 0001 1000 0101 1001 0010 1000 0110 1010

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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