3.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462 Converted to 64 Bit Double Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal 3.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462(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
3.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462(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: 3.
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;
  • 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.

3(10) =

11(2)


3. Convert to binary (base 2) the fractional part: 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462.

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) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 924;
  • 2) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 924 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 848;
  • 3) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 848 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 667 696;
  • 4) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 667 696 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 335 392;
  • 5) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 335 392 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 670 784;
  • 6) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 670 784 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 341 568;
  • 7) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 341 568 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 683 136;
  • 8) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 683 136 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 366 272;
  • 9) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 366 272 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 732 544;
  • 10) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 732 544 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 465 088;
  • 11) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 465 088 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 930 176;
  • 12) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 930 176 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 860 352;
  • 13) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 860 352 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 667 720 704;
  • 14) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 667 720 704 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 335 441 408;
  • 15) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 335 441 408 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 670 882 816;
  • 16) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 670 882 816 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 341 765 632;
  • 17) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 341 765 632 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 683 531 264;
  • 18) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 683 531 264 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 367 062 528;
  • 19) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 367 062 528 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 734 125 056;
  • 20) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 734 125 056 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 468 250 112;
  • 21) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 468 250 112 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 936 500 224;
  • 22) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 936 500 224 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 873 000 448;
  • 23) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 873 000 448 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 667 746 000 896;
  • 24) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 667 746 000 896 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 335 492 001 792;
  • 25) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 335 492 001 792 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 670 984 003 584;
  • 26) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 670 984 003 584 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 341 968 007 168;
  • 27) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 341 968 007 168 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 683 936 014 336;
  • 28) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 683 936 014 336 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 367 872 028 672;
  • 29) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 367 872 028 672 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 735 744 057 344;
  • 30) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 735 744 057 344 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 471 488 114 688;
  • 31) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 471 488 114 688 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 942 976 229 376;
  • 32) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 666 942 976 229 376 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 885 952 458 752;
  • 33) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 885 952 458 752 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 667 771 904 917 504;
  • 34) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 667 771 904 917 504 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 335 543 809 835 008;
  • 35) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 335 543 809 835 008 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 671 087 619 670 016;
  • 36) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 671 087 619 670 016 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 342 175 239 340 032;
  • 37) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 342 175 239 340 032 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 684 350 478 680 064;
  • 38) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 684 350 478 680 064 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 368 700 957 360 128;
  • 39) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 368 700 957 360 128 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 737 401 914 720 256;
  • 40) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 737 401 914 720 256 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 474 803 829 440 512;
  • 41) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 474 803 829 440 512 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 949 607 658 881 024;
  • 42) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 666 949 607 658 881 024 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 899 215 317 762 048;
  • 43) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 899 215 317 762 048 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 667 798 430 635 524 096;
  • 44) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 667 798 430 635 524 096 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 335 596 861 271 048 192;
  • 45) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 335 596 861 271 048 192 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 671 193 722 542 096 384;
  • 46) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 671 193 722 542 096 384 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 342 387 445 084 192 768;
  • 47) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 342 387 445 084 192 768 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 684 774 890 168 385 536;
  • 48) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 684 774 890 168 385 536 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 369 549 780 336 771 072;
  • 49) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 369 549 780 336 771 072 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 739 099 560 673 542 144;
  • 50) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 739 099 560 673 542 144 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 478 199 121 347 084 288;
  • 51) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 478 199 121 347 084 288 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 666 956 398 242 694 168 576;
  • 52) 0.666 666 666 666 666 666 666 666 666 666 666 666 666 956 398 242 694 168 576 × 2 = 1 + 0.333 333 333 333 333 333 333 333 333 333 333 333 333 912 796 485 388 337 152;
  • 53) 0.333 333 333 333 333 333 333 333 333 333 333 333 333 912 796 485 388 337 152 × 2 = 0 + 0.666 666 666 666 666 666 666 666 666 666 666 666 667 825 592 970 776 674 304;

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:


0.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462(10) =

0.0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0(2)

5. Positive number before normalization:

3.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462(10) =

11.0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0(2)

6. Normalize the binary representation of the number.

Shift the decimal mark 1 positions to the left, so that only one non zero digit remains to the left of it:


3.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462(10) =

11.0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0(2) =

11.0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0(2) × 20 =

1.1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 10(2) × 21


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): 1

Mantissa (not normalized):
1.1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 10


8. Adjust the exponent.

Use the 11 bit excess/bias notation:


Exponent (adjusted) =

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

1 + 2(11-1) - 1 =

(1 + 1 023)(10) =

1 024(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;
  • 1 024 ÷ 2 = 512 + 0;
  • 512 ÷ 2 = 256 + 0;
  • 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) =

1024(10) =

100 0000 0000(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. 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 10 =

1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010


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 0000

Mantissa (52 bits) =
1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010


Decimal number 3.333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 333 462 converted to 64 bit double precision IEEE 754 binary floating point representation:

0 - 100 0000 0000 - 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 1010 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