24.777 777 777 777 777 777 777 922 7 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 24.777 777 777 777 777 777 777 922 7(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
24.777 777 777 777 777 777 777 922 7(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: 24.
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;
  • 24 ÷ 2 = 12 + 0;
  • 12 ÷ 2 = 6 + 0;
  • 6 ÷ 2 = 3 + 0;
  • 3 ÷ 2 = 1 + 1;
  • 1 ÷ 2 = 0 + 1;

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.

24(10) =

1 1000(2)


3. Convert to binary (base 2) the fractional part: 0.777 777 777 777 777 777 777 922 7.

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) 0.777 777 777 777 777 777 777 922 7 × 2 = 1 + 0.555 555 555 555 555 555 555 845 4;
  • 2) 0.555 555 555 555 555 555 555 845 4 × 2 = 1 + 0.111 111 111 111 111 111 111 690 8;
  • 3) 0.111 111 111 111 111 111 111 690 8 × 2 = 0 + 0.222 222 222 222 222 222 223 381 6;
  • 4) 0.222 222 222 222 222 222 223 381 6 × 2 = 0 + 0.444 444 444 444 444 444 446 763 2;
  • 5) 0.444 444 444 444 444 444 446 763 2 × 2 = 0 + 0.888 888 888 888 888 888 893 526 4;
  • 6) 0.888 888 888 888 888 888 893 526 4 × 2 = 1 + 0.777 777 777 777 777 777 787 052 8;
  • 7) 0.777 777 777 777 777 777 787 052 8 × 2 = 1 + 0.555 555 555 555 555 555 574 105 6;
  • 8) 0.555 555 555 555 555 555 574 105 6 × 2 = 1 + 0.111 111 111 111 111 111 148 211 2;
  • 9) 0.111 111 111 111 111 111 148 211 2 × 2 = 0 + 0.222 222 222 222 222 222 296 422 4;
  • 10) 0.222 222 222 222 222 222 296 422 4 × 2 = 0 + 0.444 444 444 444 444 444 592 844 8;
  • 11) 0.444 444 444 444 444 444 592 844 8 × 2 = 0 + 0.888 888 888 888 888 889 185 689 6;
  • 12) 0.888 888 888 888 888 889 185 689 6 × 2 = 1 + 0.777 777 777 777 777 778 371 379 2;
  • 13) 0.777 777 777 777 777 778 371 379 2 × 2 = 1 + 0.555 555 555 555 555 556 742 758 4;
  • 14) 0.555 555 555 555 555 556 742 758 4 × 2 = 1 + 0.111 111 111 111 111 113 485 516 8;
  • 15) 0.111 111 111 111 111 113 485 516 8 × 2 = 0 + 0.222 222 222 222 222 226 971 033 6;
  • 16) 0.222 222 222 222 222 226 971 033 6 × 2 = 0 + 0.444 444 444 444 444 453 942 067 2;
  • 17) 0.444 444 444 444 444 453 942 067 2 × 2 = 0 + 0.888 888 888 888 888 907 884 134 4;
  • 18) 0.888 888 888 888 888 907 884 134 4 × 2 = 1 + 0.777 777 777 777 777 815 768 268 8;
  • 19) 0.777 777 777 777 777 815 768 268 8 × 2 = 1 + 0.555 555 555 555 555 631 536 537 6;
  • 20) 0.555 555 555 555 555 631 536 537 6 × 2 = 1 + 0.111 111 111 111 111 263 073 075 2;
  • 21) 0.111 111 111 111 111 263 073 075 2 × 2 = 0 + 0.222 222 222 222 222 526 146 150 4;
  • 22) 0.222 222 222 222 222 526 146 150 4 × 2 = 0 + 0.444 444 444 444 445 052 292 300 8;
  • 23) 0.444 444 444 444 445 052 292 300 8 × 2 = 0 + 0.888 888 888 888 890 104 584 601 6;
  • 24) 0.888 888 888 888 890 104 584 601 6 × 2 = 1 + 0.777 777 777 777 780 209 169 203 2;
  • 25) 0.777 777 777 777 780 209 169 203 2 × 2 = 1 + 0.555 555 555 555 560 418 338 406 4;
  • 26) 0.555 555 555 555 560 418 338 406 4 × 2 = 1 + 0.111 111 111 111 120 836 676 812 8;
  • 27) 0.111 111 111 111 120 836 676 812 8 × 2 = 0 + 0.222 222 222 222 241 673 353 625 6;
  • 28) 0.222 222 222 222 241 673 353 625 6 × 2 = 0 + 0.444 444 444 444 483 346 707 251 2;
  • 29) 0.444 444 444 444 483 346 707 251 2 × 2 = 0 + 0.888 888 888 888 966 693 414 502 4;
  • 30) 0.888 888 888 888 966 693 414 502 4 × 2 = 1 + 0.777 777 777 777 933 386 829 004 8;
  • 31) 0.777 777 777 777 933 386 829 004 8 × 2 = 1 + 0.555 555 555 555 866 773 658 009 6;
  • 32) 0.555 555 555 555 866 773 658 009 6 × 2 = 1 + 0.111 111 111 111 733 547 316 019 2;
  • 33) 0.111 111 111 111 733 547 316 019 2 × 2 = 0 + 0.222 222 222 223 467 094 632 038 4;
  • 34) 0.222 222 222 223 467 094 632 038 4 × 2 = 0 + 0.444 444 444 446 934 189 264 076 8;
  • 35) 0.444 444 444 446 934 189 264 076 8 × 2 = 0 + 0.888 888 888 893 868 378 528 153 6;
  • 36) 0.888 888 888 893 868 378 528 153 6 × 2 = 1 + 0.777 777 777 787 736 757 056 307 2;
  • 37) 0.777 777 777 787 736 757 056 307 2 × 2 = 1 + 0.555 555 555 575 473 514 112 614 4;
  • 38) 0.555 555 555 575 473 514 112 614 4 × 2 = 1 + 0.111 111 111 150 947 028 225 228 8;
  • 39) 0.111 111 111 150 947 028 225 228 8 × 2 = 0 + 0.222 222 222 301 894 056 450 457 6;
  • 40) 0.222 222 222 301 894 056 450 457 6 × 2 = 0 + 0.444 444 444 603 788 112 900 915 2;
  • 41) 0.444 444 444 603 788 112 900 915 2 × 2 = 0 + 0.888 888 889 207 576 225 801 830 4;
  • 42) 0.888 888 889 207 576 225 801 830 4 × 2 = 1 + 0.777 777 778 415 152 451 603 660 8;
  • 43) 0.777 777 778 415 152 451 603 660 8 × 2 = 1 + 0.555 555 556 830 304 903 207 321 6;
  • 44) 0.555 555 556 830 304 903 207 321 6 × 2 = 1 + 0.111 111 113 660 609 806 414 643 2;
  • 45) 0.111 111 113 660 609 806 414 643 2 × 2 = 0 + 0.222 222 227 321 219 612 829 286 4;
  • 46) 0.222 222 227 321 219 612 829 286 4 × 2 = 0 + 0.444 444 454 642 439 225 658 572 8;
  • 47) 0.444 444 454 642 439 225 658 572 8 × 2 = 0 + 0.888 888 909 284 878 451 317 145 6;
  • 48) 0.888 888 909 284 878 451 317 145 6 × 2 = 1 + 0.777 777 818 569 756 902 634 291 2;
  • 49) 0.777 777 818 569 756 902 634 291 2 × 2 = 1 + 0.555 555 637 139 513 805 268 582 4;
  • 50) 0.555 555 637 139 513 805 268 582 4 × 2 = 1 + 0.111 111 274 279 027 610 537 164 8;
  • 51) 0.111 111 274 279 027 610 537 164 8 × 2 = 0 + 0.222 222 548 558 055 221 074 329 6;
  • 52) 0.222 222 548 558 055 221 074 329 6 × 2 = 0 + 0.444 445 097 116 110 442 148 659 2;
  • 53) 0.444 445 097 116 110 442 148 659 2 × 2 = 0 + 0.888 890 194 232 220 884 297 318 4;

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:


0.777 777 777 777 777 777 777 922 7(10) =

0.1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0(2)

5. Positive number before normalization:

24.777 777 777 777 777 777 777 922 7(10) =

1 1000.1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 4 positions to the left, so that only one non zero digit remains to the left of it:


24.777 777 777 777 777 777 777 922 7(10) =

1 1000.1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0(2) =

1 1000.1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0(2) × 20 =

1.1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0(2) × 24


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): 4

Mantissa (not normalized):
1.1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

4 + 2(11-1) - 1 =

(4 + 1 023)(10) =

1 027(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;
  • 1 027 ÷ 2 = 513 + 1;
  • 513 ÷ 2 = 256 + 1;
  • 256 ÷ 2 = 128 + 0;
  • 128 ÷ 2 = 64 + 0;
  • 64 ÷ 2 = 32 + 0;
  • 32 ÷ 2 = 16 + 0;
  • 16 ÷ 2 = 8 + 0;
  • 8 ÷ 2 = 4 + 0;
  • 4 ÷ 2 = 2 + 0;
  • 2 ÷ 2 = 1 + 0;
  • 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) =

1027(10) =

100 0000 0011(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, by removing the excess bits, from the right (if any of the excess bits is set on 1, we are losing precision...).


Mantissa (normalized) =

1. 1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 0001 1 1000 =

1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 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) =
100 0000 0011

Mantissa (52 bits) =
1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 0001


Decimal number 24.777 777 777 777 777 777 777 922 7 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 100 0000 0011 - 1000 1100 0111 0001 1100 0111 0001 1100 0111 0001 1100 0111 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