-0.016 738 891 601 562 496 530 605 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal -0.016 738 891 601 562 496 530 605(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
-0.016 738 891 601 562 496 530 605(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:

|-0.016 738 891 601 562 496 530 605| = 0.016 738 891 601 562 496 530 605


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: 0.016 738 891 601 562 496 530 605.

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) 0.016 738 891 601 562 496 530 605 × 2 = 0 + 0.033 477 783 203 124 993 061 21;
  • 2) 0.033 477 783 203 124 993 061 21 × 2 = 0 + 0.066 955 566 406 249 986 122 42;
  • 3) 0.066 955 566 406 249 986 122 42 × 2 = 0 + 0.133 911 132 812 499 972 244 84;
  • 4) 0.133 911 132 812 499 972 244 84 × 2 = 0 + 0.267 822 265 624 999 944 489 68;
  • 5) 0.267 822 265 624 999 944 489 68 × 2 = 0 + 0.535 644 531 249 999 888 979 36;
  • 6) 0.535 644 531 249 999 888 979 36 × 2 = 1 + 0.071 289 062 499 999 777 958 72;
  • 7) 0.071 289 062 499 999 777 958 72 × 2 = 0 + 0.142 578 124 999 999 555 917 44;
  • 8) 0.142 578 124 999 999 555 917 44 × 2 = 0 + 0.285 156 249 999 999 111 834 88;
  • 9) 0.285 156 249 999 999 111 834 88 × 2 = 0 + 0.570 312 499 999 998 223 669 76;
  • 10) 0.570 312 499 999 998 223 669 76 × 2 = 1 + 0.140 624 999 999 996 447 339 52;
  • 11) 0.140 624 999 999 996 447 339 52 × 2 = 0 + 0.281 249 999 999 992 894 679 04;
  • 12) 0.281 249 999 999 992 894 679 04 × 2 = 0 + 0.562 499 999 999 985 789 358 08;
  • 13) 0.562 499 999 999 985 789 358 08 × 2 = 1 + 0.124 999 999 999 971 578 716 16;
  • 14) 0.124 999 999 999 971 578 716 16 × 2 = 0 + 0.249 999 999 999 943 157 432 32;
  • 15) 0.249 999 999 999 943 157 432 32 × 2 = 0 + 0.499 999 999 999 886 314 864 64;
  • 16) 0.499 999 999 999 886 314 864 64 × 2 = 0 + 0.999 999 999 999 772 629 729 28;
  • 17) 0.999 999 999 999 772 629 729 28 × 2 = 1 + 0.999 999 999 999 545 259 458 56;
  • 18) 0.999 999 999 999 545 259 458 56 × 2 = 1 + 0.999 999 999 999 090 518 917 12;
  • 19) 0.999 999 999 999 090 518 917 12 × 2 = 1 + 0.999 999 999 998 181 037 834 24;
  • 20) 0.999 999 999 998 181 037 834 24 × 2 = 1 + 0.999 999 999 996 362 075 668 48;
  • 21) 0.999 999 999 996 362 075 668 48 × 2 = 1 + 0.999 999 999 992 724 151 336 96;
  • 22) 0.999 999 999 992 724 151 336 96 × 2 = 1 + 0.999 999 999 985 448 302 673 92;
  • 23) 0.999 999 999 985 448 302 673 92 × 2 = 1 + 0.999 999 999 970 896 605 347 84;
  • 24) 0.999 999 999 970 896 605 347 84 × 2 = 1 + 0.999 999 999 941 793 210 695 68;
  • 25) 0.999 999 999 941 793 210 695 68 × 2 = 1 + 0.999 999 999 883 586 421 391 36;
  • 26) 0.999 999 999 883 586 421 391 36 × 2 = 1 + 0.999 999 999 767 172 842 782 72;
  • 27) 0.999 999 999 767 172 842 782 72 × 2 = 1 + 0.999 999 999 534 345 685 565 44;
  • 28) 0.999 999 999 534 345 685 565 44 × 2 = 1 + 0.999 999 999 068 691 371 130 88;
  • 29) 0.999 999 999 068 691 371 130 88 × 2 = 1 + 0.999 999 998 137 382 742 261 76;
  • 30) 0.999 999 998 137 382 742 261 76 × 2 = 1 + 0.999 999 996 274 765 484 523 52;
  • 31) 0.999 999 996 274 765 484 523 52 × 2 = 1 + 0.999 999 992 549 530 969 047 04;
  • 32) 0.999 999 992 549 530 969 047 04 × 2 = 1 + 0.999 999 985 099 061 938 094 08;
  • 33) 0.999 999 985 099 061 938 094 08 × 2 = 1 + 0.999 999 970 198 123 876 188 16;
  • 34) 0.999 999 970 198 123 876 188 16 × 2 = 1 + 0.999 999 940 396 247 752 376 32;
  • 35) 0.999 999 940 396 247 752 376 32 × 2 = 1 + 0.999 999 880 792 495 504 752 64;
  • 36) 0.999 999 880 792 495 504 752 64 × 2 = 1 + 0.999 999 761 584 991 009 505 28;
  • 37) 0.999 999 761 584 991 009 505 28 × 2 = 1 + 0.999 999 523 169 982 019 010 56;
  • 38) 0.999 999 523 169 982 019 010 56 × 2 = 1 + 0.999 999 046 339 964 038 021 12;
  • 39) 0.999 999 046 339 964 038 021 12 × 2 = 1 + 0.999 998 092 679 928 076 042 24;
  • 40) 0.999 998 092 679 928 076 042 24 × 2 = 1 + 0.999 996 185 359 856 152 084 48;
  • 41) 0.999 996 185 359 856 152 084 48 × 2 = 1 + 0.999 992 370 719 712 304 168 96;
  • 42) 0.999 992 370 719 712 304 168 96 × 2 = 1 + 0.999 984 741 439 424 608 337 92;
  • 43) 0.999 984 741 439 424 608 337 92 × 2 = 1 + 0.999 969 482 878 849 216 675 84;
  • 44) 0.999 969 482 878 849 216 675 84 × 2 = 1 + 0.999 938 965 757 698 433 351 68;
  • 45) 0.999 938 965 757 698 433 351 68 × 2 = 1 + 0.999 877 931 515 396 866 703 36;
  • 46) 0.999 877 931 515 396 866 703 36 × 2 = 1 + 0.999 755 863 030 793 733 406 72;
  • 47) 0.999 755 863 030 793 733 406 72 × 2 = 1 + 0.999 511 726 061 587 466 813 44;
  • 48) 0.999 511 726 061 587 466 813 44 × 2 = 1 + 0.999 023 452 123 174 933 626 88;
  • 49) 0.999 023 452 123 174 933 626 88 × 2 = 1 + 0.998 046 904 246 349 867 253 76;
  • 50) 0.998 046 904 246 349 867 253 76 × 2 = 1 + 0.996 093 808 492 699 734 507 52;
  • 51) 0.996 093 808 492 699 734 507 52 × 2 = 1 + 0.992 187 616 985 399 469 015 04;
  • 52) 0.992 187 616 985 399 469 015 04 × 2 = 1 + 0.984 375 233 970 798 938 030 08;
  • 53) 0.984 375 233 970 798 938 030 08 × 2 = 1 + 0.968 750 467 941 597 876 060 16;
  • 54) 0.968 750 467 941 597 876 060 16 × 2 = 1 + 0.937 500 935 883 195 752 120 32;
  • 55) 0.937 500 935 883 195 752 120 32 × 2 = 1 + 0.875 001 871 766 391 504 240 64;
  • 56) 0.875 001 871 766 391 504 240 64 × 2 = 1 + 0.750 003 743 532 783 008 481 28;
  • 57) 0.750 003 743 532 783 008 481 28 × 2 = 1 + 0.500 007 487 065 566 016 962 56;
  • 58) 0.500 007 487 065 566 016 962 56 × 2 = 1 + 0.000 014 974 131 132 033 925 12;

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:


0.016 738 891 601 562 496 530 605(10) =

0.0000 0100 0100 1000 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 11(2)

6. Positive number before normalization:

0.016 738 891 601 562 496 530 605(10) =

0.0000 0100 0100 1000 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 11(2)

7. Normalize the binary representation of the number.

Shift the decimal mark 6 positions to the right, so that only one non zero digit remains to the left of it:


0.016 738 891 601 562 496 530 605(10) =

0.0000 0100 0100 1000 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 11(2) =

0.0000 0100 0100 1000 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 11(2) × 20 =

1.0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111(2) × 2-6


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): -6

Mantissa (not normalized):
1.0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111


9. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

-6 + 2(11-1) - 1 =

(-6 + 1 023)(10) =

1 017(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;
  • 1 017 ÷ 2 = 508 + 1;
  • 508 ÷ 2 = 254 + 0;
  • 254 ÷ 2 = 127 + 0;
  • 127 ÷ 2 = 63 + 1;
  • 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) =

1017(10) =

011 1111 1001(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. 0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 =

0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111


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 1001

Mantissa (52 bits) =
0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111


Decimal number -0.016 738 891 601 562 496 530 605 converted to 64 bit double precision IEEE 754 binary floating point representation:

1 - 011 1111 1001 - 0001 0010 0011 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111

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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