-0.000 806 264 623 585 362 514 063 654 156 856 105 025 9 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal -0.000 806 264 623 585 362 514 063 654 156 856 105 025 9(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
-0.000 806 264 623 585 362 514 063 654 156 856 105 025 9(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:

|-0.000 806 264 623 585 362 514 063 654 156 856 105 025 9| = 0.000 806 264 623 585 362 514 063 654 156 856 105 025 9


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: 0.000 806 264 623 585 362 514 063 654 156 856 105 025 9.

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) 0.000 806 264 623 585 362 514 063 654 156 856 105 025 9 × 2 = 0 + 0.001 612 529 247 170 725 028 127 308 313 712 210 051 8;
  • 2) 0.001 612 529 247 170 725 028 127 308 313 712 210 051 8 × 2 = 0 + 0.003 225 058 494 341 450 056 254 616 627 424 420 103 6;
  • 3) 0.003 225 058 494 341 450 056 254 616 627 424 420 103 6 × 2 = 0 + 0.006 450 116 988 682 900 112 509 233 254 848 840 207 2;
  • 4) 0.006 450 116 988 682 900 112 509 233 254 848 840 207 2 × 2 = 0 + 0.012 900 233 977 365 800 225 018 466 509 697 680 414 4;
  • 5) 0.012 900 233 977 365 800 225 018 466 509 697 680 414 4 × 2 = 0 + 0.025 800 467 954 731 600 450 036 933 019 395 360 828 8;
  • 6) 0.025 800 467 954 731 600 450 036 933 019 395 360 828 8 × 2 = 0 + 0.051 600 935 909 463 200 900 073 866 038 790 721 657 6;
  • 7) 0.051 600 935 909 463 200 900 073 866 038 790 721 657 6 × 2 = 0 + 0.103 201 871 818 926 401 800 147 732 077 581 443 315 2;
  • 8) 0.103 201 871 818 926 401 800 147 732 077 581 443 315 2 × 2 = 0 + 0.206 403 743 637 852 803 600 295 464 155 162 886 630 4;
  • 9) 0.206 403 743 637 852 803 600 295 464 155 162 886 630 4 × 2 = 0 + 0.412 807 487 275 705 607 200 590 928 310 325 773 260 8;
  • 10) 0.412 807 487 275 705 607 200 590 928 310 325 773 260 8 × 2 = 0 + 0.825 614 974 551 411 214 401 181 856 620 651 546 521 6;
  • 11) 0.825 614 974 551 411 214 401 181 856 620 651 546 521 6 × 2 = 1 + 0.651 229 949 102 822 428 802 363 713 241 303 093 043 2;
  • 12) 0.651 229 949 102 822 428 802 363 713 241 303 093 043 2 × 2 = 1 + 0.302 459 898 205 644 857 604 727 426 482 606 186 086 4;
  • 13) 0.302 459 898 205 644 857 604 727 426 482 606 186 086 4 × 2 = 0 + 0.604 919 796 411 289 715 209 454 852 965 212 372 172 8;
  • 14) 0.604 919 796 411 289 715 209 454 852 965 212 372 172 8 × 2 = 1 + 0.209 839 592 822 579 430 418 909 705 930 424 744 345 6;
  • 15) 0.209 839 592 822 579 430 418 909 705 930 424 744 345 6 × 2 = 0 + 0.419 679 185 645 158 860 837 819 411 860 849 488 691 2;
  • 16) 0.419 679 185 645 158 860 837 819 411 860 849 488 691 2 × 2 = 0 + 0.839 358 371 290 317 721 675 638 823 721 698 977 382 4;
  • 17) 0.839 358 371 290 317 721 675 638 823 721 698 977 382 4 × 2 = 1 + 0.678 716 742 580 635 443 351 277 647 443 397 954 764 8;
  • 18) 0.678 716 742 580 635 443 351 277 647 443 397 954 764 8 × 2 = 1 + 0.357 433 485 161 270 886 702 555 294 886 795 909 529 6;
  • 19) 0.357 433 485 161 270 886 702 555 294 886 795 909 529 6 × 2 = 0 + 0.714 866 970 322 541 773 405 110 589 773 591 819 059 2;
  • 20) 0.714 866 970 322 541 773 405 110 589 773 591 819 059 2 × 2 = 1 + 0.429 733 940 645 083 546 810 221 179 547 183 638 118 4;
  • 21) 0.429 733 940 645 083 546 810 221 179 547 183 638 118 4 × 2 = 0 + 0.859 467 881 290 167 093 620 442 359 094 367 276 236 8;
  • 22) 0.859 467 881 290 167 093 620 442 359 094 367 276 236 8 × 2 = 1 + 0.718 935 762 580 334 187 240 884 718 188 734 552 473 6;
  • 23) 0.718 935 762 580 334 187 240 884 718 188 734 552 473 6 × 2 = 1 + 0.437 871 525 160 668 374 481 769 436 377 469 104 947 2;
  • 24) 0.437 871 525 160 668 374 481 769 436 377 469 104 947 2 × 2 = 0 + 0.875 743 050 321 336 748 963 538 872 754 938 209 894 4;
  • 25) 0.875 743 050 321 336 748 963 538 872 754 938 209 894 4 × 2 = 1 + 0.751 486 100 642 673 497 927 077 745 509 876 419 788 8;
  • 26) 0.751 486 100 642 673 497 927 077 745 509 876 419 788 8 × 2 = 1 + 0.502 972 201 285 346 995 854 155 491 019 752 839 577 6;
  • 27) 0.502 972 201 285 346 995 854 155 491 019 752 839 577 6 × 2 = 1 + 0.005 944 402 570 693 991 708 310 982 039 505 679 155 2;
  • 28) 0.005 944 402 570 693 991 708 310 982 039 505 679 155 2 × 2 = 0 + 0.011 888 805 141 387 983 416 621 964 079 011 358 310 4;
  • 29) 0.011 888 805 141 387 983 416 621 964 079 011 358 310 4 × 2 = 0 + 0.023 777 610 282 775 966 833 243 928 158 022 716 620 8;
  • 30) 0.023 777 610 282 775 966 833 243 928 158 022 716 620 8 × 2 = 0 + 0.047 555 220 565 551 933 666 487 856 316 045 433 241 6;
  • 31) 0.047 555 220 565 551 933 666 487 856 316 045 433 241 6 × 2 = 0 + 0.095 110 441 131 103 867 332 975 712 632 090 866 483 2;
  • 32) 0.095 110 441 131 103 867 332 975 712 632 090 866 483 2 × 2 = 0 + 0.190 220 882 262 207 734 665 951 425 264 181 732 966 4;
  • 33) 0.190 220 882 262 207 734 665 951 425 264 181 732 966 4 × 2 = 0 + 0.380 441 764 524 415 469 331 902 850 528 363 465 932 8;
  • 34) 0.380 441 764 524 415 469 331 902 850 528 363 465 932 8 × 2 = 0 + 0.760 883 529 048 830 938 663 805 701 056 726 931 865 6;
  • 35) 0.760 883 529 048 830 938 663 805 701 056 726 931 865 6 × 2 = 1 + 0.521 767 058 097 661 877 327 611 402 113 453 863 731 2;
  • 36) 0.521 767 058 097 661 877 327 611 402 113 453 863 731 2 × 2 = 1 + 0.043 534 116 195 323 754 655 222 804 226 907 727 462 4;
  • 37) 0.043 534 116 195 323 754 655 222 804 226 907 727 462 4 × 2 = 0 + 0.087 068 232 390 647 509 310 445 608 453 815 454 924 8;
  • 38) 0.087 068 232 390 647 509 310 445 608 453 815 454 924 8 × 2 = 0 + 0.174 136 464 781 295 018 620 891 216 907 630 909 849 6;
  • 39) 0.174 136 464 781 295 018 620 891 216 907 630 909 849 6 × 2 = 0 + 0.348 272 929 562 590 037 241 782 433 815 261 819 699 2;
  • 40) 0.348 272 929 562 590 037 241 782 433 815 261 819 699 2 × 2 = 0 + 0.696 545 859 125 180 074 483 564 867 630 523 639 398 4;
  • 41) 0.696 545 859 125 180 074 483 564 867 630 523 639 398 4 × 2 = 1 + 0.393 091 718 250 360 148 967 129 735 261 047 278 796 8;
  • 42) 0.393 091 718 250 360 148 967 129 735 261 047 278 796 8 × 2 = 0 + 0.786 183 436 500 720 297 934 259 470 522 094 557 593 6;
  • 43) 0.786 183 436 500 720 297 934 259 470 522 094 557 593 6 × 2 = 1 + 0.572 366 873 001 440 595 868 518 941 044 189 115 187 2;
  • 44) 0.572 366 873 001 440 595 868 518 941 044 189 115 187 2 × 2 = 1 + 0.144 733 746 002 881 191 737 037 882 088 378 230 374 4;
  • 45) 0.144 733 746 002 881 191 737 037 882 088 378 230 374 4 × 2 = 0 + 0.289 467 492 005 762 383 474 075 764 176 756 460 748 8;
  • 46) 0.289 467 492 005 762 383 474 075 764 176 756 460 748 8 × 2 = 0 + 0.578 934 984 011 524 766 948 151 528 353 512 921 497 6;
  • 47) 0.578 934 984 011 524 766 948 151 528 353 512 921 497 6 × 2 = 1 + 0.157 869 968 023 049 533 896 303 056 707 025 842 995 2;
  • 48) 0.157 869 968 023 049 533 896 303 056 707 025 842 995 2 × 2 = 0 + 0.315 739 936 046 099 067 792 606 113 414 051 685 990 4;
  • 49) 0.315 739 936 046 099 067 792 606 113 414 051 685 990 4 × 2 = 0 + 0.631 479 872 092 198 135 585 212 226 828 103 371 980 8;
  • 50) 0.631 479 872 092 198 135 585 212 226 828 103 371 980 8 × 2 = 1 + 0.262 959 744 184 396 271 170 424 453 656 206 743 961 6;
  • 51) 0.262 959 744 184 396 271 170 424 453 656 206 743 961 6 × 2 = 0 + 0.525 919 488 368 792 542 340 848 907 312 413 487 923 2;
  • 52) 0.525 919 488 368 792 542 340 848 907 312 413 487 923 2 × 2 = 1 + 0.051 838 976 737 585 084 681 697 814 624 826 975 846 4;
  • 53) 0.051 838 976 737 585 084 681 697 814 624 826 975 846 4 × 2 = 0 + 0.103 677 953 475 170 169 363 395 629 249 653 951 692 8;
  • 54) 0.103 677 953 475 170 169 363 395 629 249 653 951 692 8 × 2 = 0 + 0.207 355 906 950 340 338 726 791 258 499 307 903 385 6;
  • 55) 0.207 355 906 950 340 338 726 791 258 499 307 903 385 6 × 2 = 0 + 0.414 711 813 900 680 677 453 582 516 998 615 806 771 2;
  • 56) 0.414 711 813 900 680 677 453 582 516 998 615 806 771 2 × 2 = 0 + 0.829 423 627 801 361 354 907 165 033 997 231 613 542 4;
  • 57) 0.829 423 627 801 361 354 907 165 033 997 231 613 542 4 × 2 = 1 + 0.658 847 255 602 722 709 814 330 067 994 463 227 084 8;
  • 58) 0.658 847 255 602 722 709 814 330 067 994 463 227 084 8 × 2 = 1 + 0.317 694 511 205 445 419 628 660 135 988 926 454 169 6;
  • 59) 0.317 694 511 205 445 419 628 660 135 988 926 454 169 6 × 2 = 0 + 0.635 389 022 410 890 839 257 320 271 977 852 908 339 2;
  • 60) 0.635 389 022 410 890 839 257 320 271 977 852 908 339 2 × 2 = 1 + 0.270 778 044 821 781 678 514 640 543 955 705 816 678 4;
  • 61) 0.270 778 044 821 781 678 514 640 543 955 705 816 678 4 × 2 = 0 + 0.541 556 089 643 563 357 029 281 087 911 411 633 356 8;
  • 62) 0.541 556 089 643 563 357 029 281 087 911 411 633 356 8 × 2 = 1 + 0.083 112 179 287 126 714 058 562 175 822 823 266 713 6;
  • 63) 0.083 112 179 287 126 714 058 562 175 822 823 266 713 6 × 2 = 0 + 0.166 224 358 574 253 428 117 124 351 645 646 533 427 2;

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:


0.000 806 264 623 585 362 514 063 654 156 856 105 025 9(10) =

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

6. Positive number before normalization:

0.000 806 264 623 585 362 514 063 654 156 856 105 025 9(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:


0.000 806 264 623 585 362 514 063 654 156 856 105 025 9(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 -0.000 806 264 623 585 362 514 063 654 156 856 105 025 9 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