-0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal -0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466(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
-0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466(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:

|-0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466| = 0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466


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: 0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466.

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) 0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466 × 2 = 0 + 0.001 612 529 247 170 725 028 127 308 313 712 210 068 684 932;
  • 2) 0.001 612 529 247 170 725 028 127 308 313 712 210 068 684 932 × 2 = 0 + 0.003 225 058 494 341 450 056 254 616 627 424 420 137 369 864;
  • 3) 0.003 225 058 494 341 450 056 254 616 627 424 420 137 369 864 × 2 = 0 + 0.006 450 116 988 682 900 112 509 233 254 848 840 274 739 728;
  • 4) 0.006 450 116 988 682 900 112 509 233 254 848 840 274 739 728 × 2 = 0 + 0.012 900 233 977 365 800 225 018 466 509 697 680 549 479 456;
  • 5) 0.012 900 233 977 365 800 225 018 466 509 697 680 549 479 456 × 2 = 0 + 0.025 800 467 954 731 600 450 036 933 019 395 361 098 958 912;
  • 6) 0.025 800 467 954 731 600 450 036 933 019 395 361 098 958 912 × 2 = 0 + 0.051 600 935 909 463 200 900 073 866 038 790 722 197 917 824;
  • 7) 0.051 600 935 909 463 200 900 073 866 038 790 722 197 917 824 × 2 = 0 + 0.103 201 871 818 926 401 800 147 732 077 581 444 395 835 648;
  • 8) 0.103 201 871 818 926 401 800 147 732 077 581 444 395 835 648 × 2 = 0 + 0.206 403 743 637 852 803 600 295 464 155 162 888 791 671 296;
  • 9) 0.206 403 743 637 852 803 600 295 464 155 162 888 791 671 296 × 2 = 0 + 0.412 807 487 275 705 607 200 590 928 310 325 777 583 342 592;
  • 10) 0.412 807 487 275 705 607 200 590 928 310 325 777 583 342 592 × 2 = 0 + 0.825 614 974 551 411 214 401 181 856 620 651 555 166 685 184;
  • 11) 0.825 614 974 551 411 214 401 181 856 620 651 555 166 685 184 × 2 = 1 + 0.651 229 949 102 822 428 802 363 713 241 303 110 333 370 368;
  • 12) 0.651 229 949 102 822 428 802 363 713 241 303 110 333 370 368 × 2 = 1 + 0.302 459 898 205 644 857 604 727 426 482 606 220 666 740 736;
  • 13) 0.302 459 898 205 644 857 604 727 426 482 606 220 666 740 736 × 2 = 0 + 0.604 919 796 411 289 715 209 454 852 965 212 441 333 481 472;
  • 14) 0.604 919 796 411 289 715 209 454 852 965 212 441 333 481 472 × 2 = 1 + 0.209 839 592 822 579 430 418 909 705 930 424 882 666 962 944;
  • 15) 0.209 839 592 822 579 430 418 909 705 930 424 882 666 962 944 × 2 = 0 + 0.419 679 185 645 158 860 837 819 411 860 849 765 333 925 888;
  • 16) 0.419 679 185 645 158 860 837 819 411 860 849 765 333 925 888 × 2 = 0 + 0.839 358 371 290 317 721 675 638 823 721 699 530 667 851 776;
  • 17) 0.839 358 371 290 317 721 675 638 823 721 699 530 667 851 776 × 2 = 1 + 0.678 716 742 580 635 443 351 277 647 443 399 061 335 703 552;
  • 18) 0.678 716 742 580 635 443 351 277 647 443 399 061 335 703 552 × 2 = 1 + 0.357 433 485 161 270 886 702 555 294 886 798 122 671 407 104;
  • 19) 0.357 433 485 161 270 886 702 555 294 886 798 122 671 407 104 × 2 = 0 + 0.714 866 970 322 541 773 405 110 589 773 596 245 342 814 208;
  • 20) 0.714 866 970 322 541 773 405 110 589 773 596 245 342 814 208 × 2 = 1 + 0.429 733 940 645 083 546 810 221 179 547 192 490 685 628 416;
  • 21) 0.429 733 940 645 083 546 810 221 179 547 192 490 685 628 416 × 2 = 0 + 0.859 467 881 290 167 093 620 442 359 094 384 981 371 256 832;
  • 22) 0.859 467 881 290 167 093 620 442 359 094 384 981 371 256 832 × 2 = 1 + 0.718 935 762 580 334 187 240 884 718 188 769 962 742 513 664;
  • 23) 0.718 935 762 580 334 187 240 884 718 188 769 962 742 513 664 × 2 = 1 + 0.437 871 525 160 668 374 481 769 436 377 539 925 485 027 328;
  • 24) 0.437 871 525 160 668 374 481 769 436 377 539 925 485 027 328 × 2 = 0 + 0.875 743 050 321 336 748 963 538 872 755 079 850 970 054 656;
  • 25) 0.875 743 050 321 336 748 963 538 872 755 079 850 970 054 656 × 2 = 1 + 0.751 486 100 642 673 497 927 077 745 510 159 701 940 109 312;
  • 26) 0.751 486 100 642 673 497 927 077 745 510 159 701 940 109 312 × 2 = 1 + 0.502 972 201 285 346 995 854 155 491 020 319 403 880 218 624;
  • 27) 0.502 972 201 285 346 995 854 155 491 020 319 403 880 218 624 × 2 = 1 + 0.005 944 402 570 693 991 708 310 982 040 638 807 760 437 248;
  • 28) 0.005 944 402 570 693 991 708 310 982 040 638 807 760 437 248 × 2 = 0 + 0.011 888 805 141 387 983 416 621 964 081 277 615 520 874 496;
  • 29) 0.011 888 805 141 387 983 416 621 964 081 277 615 520 874 496 × 2 = 0 + 0.023 777 610 282 775 966 833 243 928 162 555 231 041 748 992;
  • 30) 0.023 777 610 282 775 966 833 243 928 162 555 231 041 748 992 × 2 = 0 + 0.047 555 220 565 551 933 666 487 856 325 110 462 083 497 984;
  • 31) 0.047 555 220 565 551 933 666 487 856 325 110 462 083 497 984 × 2 = 0 + 0.095 110 441 131 103 867 332 975 712 650 220 924 166 995 968;
  • 32) 0.095 110 441 131 103 867 332 975 712 650 220 924 166 995 968 × 2 = 0 + 0.190 220 882 262 207 734 665 951 425 300 441 848 333 991 936;
  • 33) 0.190 220 882 262 207 734 665 951 425 300 441 848 333 991 936 × 2 = 0 + 0.380 441 764 524 415 469 331 902 850 600 883 696 667 983 872;
  • 34) 0.380 441 764 524 415 469 331 902 850 600 883 696 667 983 872 × 2 = 0 + 0.760 883 529 048 830 938 663 805 701 201 767 393 335 967 744;
  • 35) 0.760 883 529 048 830 938 663 805 701 201 767 393 335 967 744 × 2 = 1 + 0.521 767 058 097 661 877 327 611 402 403 534 786 671 935 488;
  • 36) 0.521 767 058 097 661 877 327 611 402 403 534 786 671 935 488 × 2 = 1 + 0.043 534 116 195 323 754 655 222 804 807 069 573 343 870 976;
  • 37) 0.043 534 116 195 323 754 655 222 804 807 069 573 343 870 976 × 2 = 0 + 0.087 068 232 390 647 509 310 445 609 614 139 146 687 741 952;
  • 38) 0.087 068 232 390 647 509 310 445 609 614 139 146 687 741 952 × 2 = 0 + 0.174 136 464 781 295 018 620 891 219 228 278 293 375 483 904;
  • 39) 0.174 136 464 781 295 018 620 891 219 228 278 293 375 483 904 × 2 = 0 + 0.348 272 929 562 590 037 241 782 438 456 556 586 750 967 808;
  • 40) 0.348 272 929 562 590 037 241 782 438 456 556 586 750 967 808 × 2 = 0 + 0.696 545 859 125 180 074 483 564 876 913 113 173 501 935 616;
  • 41) 0.696 545 859 125 180 074 483 564 876 913 113 173 501 935 616 × 2 = 1 + 0.393 091 718 250 360 148 967 129 753 826 226 347 003 871 232;
  • 42) 0.393 091 718 250 360 148 967 129 753 826 226 347 003 871 232 × 2 = 0 + 0.786 183 436 500 720 297 934 259 507 652 452 694 007 742 464;
  • 43) 0.786 183 436 500 720 297 934 259 507 652 452 694 007 742 464 × 2 = 1 + 0.572 366 873 001 440 595 868 519 015 304 905 388 015 484 928;
  • 44) 0.572 366 873 001 440 595 868 519 015 304 905 388 015 484 928 × 2 = 1 + 0.144 733 746 002 881 191 737 038 030 609 810 776 030 969 856;
  • 45) 0.144 733 746 002 881 191 737 038 030 609 810 776 030 969 856 × 2 = 0 + 0.289 467 492 005 762 383 474 076 061 219 621 552 061 939 712;
  • 46) 0.289 467 492 005 762 383 474 076 061 219 621 552 061 939 712 × 2 = 0 + 0.578 934 984 011 524 766 948 152 122 439 243 104 123 879 424;
  • 47) 0.578 934 984 011 524 766 948 152 122 439 243 104 123 879 424 × 2 = 1 + 0.157 869 968 023 049 533 896 304 244 878 486 208 247 758 848;
  • 48) 0.157 869 968 023 049 533 896 304 244 878 486 208 247 758 848 × 2 = 0 + 0.315 739 936 046 099 067 792 608 489 756 972 416 495 517 696;
  • 49) 0.315 739 936 046 099 067 792 608 489 756 972 416 495 517 696 × 2 = 0 + 0.631 479 872 092 198 135 585 216 979 513 944 832 991 035 392;
  • 50) 0.631 479 872 092 198 135 585 216 979 513 944 832 991 035 392 × 2 = 1 + 0.262 959 744 184 396 271 170 433 959 027 889 665 982 070 784;
  • 51) 0.262 959 744 184 396 271 170 433 959 027 889 665 982 070 784 × 2 = 0 + 0.525 919 488 368 792 542 340 867 918 055 779 331 964 141 568;
  • 52) 0.525 919 488 368 792 542 340 867 918 055 779 331 964 141 568 × 2 = 1 + 0.051 838 976 737 585 084 681 735 836 111 558 663 928 283 136;
  • 53) 0.051 838 976 737 585 084 681 735 836 111 558 663 928 283 136 × 2 = 0 + 0.103 677 953 475 170 169 363 471 672 223 117 327 856 566 272;
  • 54) 0.103 677 953 475 170 169 363 471 672 223 117 327 856 566 272 × 2 = 0 + 0.207 355 906 950 340 338 726 943 344 446 234 655 713 132 544;
  • 55) 0.207 355 906 950 340 338 726 943 344 446 234 655 713 132 544 × 2 = 0 + 0.414 711 813 900 680 677 453 886 688 892 469 311 426 265 088;
  • 56) 0.414 711 813 900 680 677 453 886 688 892 469 311 426 265 088 × 2 = 0 + 0.829 423 627 801 361 354 907 773 377 784 938 622 852 530 176;
  • 57) 0.829 423 627 801 361 354 907 773 377 784 938 622 852 530 176 × 2 = 1 + 0.658 847 255 602 722 709 815 546 755 569 877 245 705 060 352;
  • 58) 0.658 847 255 602 722 709 815 546 755 569 877 245 705 060 352 × 2 = 1 + 0.317 694 511 205 445 419 631 093 511 139 754 491 410 120 704;
  • 59) 0.317 694 511 205 445 419 631 093 511 139 754 491 410 120 704 × 2 = 0 + 0.635 389 022 410 890 839 262 187 022 279 508 982 820 241 408;
  • 60) 0.635 389 022 410 890 839 262 187 022 279 508 982 820 241 408 × 2 = 1 + 0.270 778 044 821 781 678 524 374 044 559 017 965 640 482 816;
  • 61) 0.270 778 044 821 781 678 524 374 044 559 017 965 640 482 816 × 2 = 0 + 0.541 556 089 643 563 357 048 748 089 118 035 931 280 965 632;
  • 62) 0.541 556 089 643 563 357 048 748 089 118 035 931 280 965 632 × 2 = 1 + 0.083 112 179 287 126 714 097 496 178 236 071 862 561 931 264;
  • 63) 0.083 112 179 287 126 714 097 496 178 236 071 862 561 931 264 × 2 = 0 + 0.166 224 358 574 253 428 194 992 356 472 143 725 123 862 528;

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:


0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466(10) =

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

6. Positive number before normalization:

0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466(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:


0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466(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 -0.000 806 264 623 585 362 514 063 654 156 856 105 034 342 466 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