-0.000 000 000 742 147 676 646 707 7 Converted to 32 Bit Single Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal -0.000 000 000 742 147 676 646 707 7(10) to 32 bit single precision IEEE 754 binary floating point representation standard (1 bit for sign, 8 bits for exponent, 23 bits for mantissa)

What are the steps to convert decimal number
-0.000 000 000 742 147 676 646 707 7(10) to 32 bit single precision IEEE 754 binary floating point representation (1 bit for sign, 8 bits for exponent, 23 bits for mantissa)

1. Start with the positive version of the number:

|-0.000 000 000 742 147 676 646 707 7| = 0.000 000 000 742 147 676 646 707 7


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: 0.000 000 000 742 147 676 646 707 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) 0.000 000 000 742 147 676 646 707 7 × 2 = 0 + 0.000 000 001 484 295 353 293 415 4;
  • 2) 0.000 000 001 484 295 353 293 415 4 × 2 = 0 + 0.000 000 002 968 590 706 586 830 8;
  • 3) 0.000 000 002 968 590 706 586 830 8 × 2 = 0 + 0.000 000 005 937 181 413 173 661 6;
  • 4) 0.000 000 005 937 181 413 173 661 6 × 2 = 0 + 0.000 000 011 874 362 826 347 323 2;
  • 5) 0.000 000 011 874 362 826 347 323 2 × 2 = 0 + 0.000 000 023 748 725 652 694 646 4;
  • 6) 0.000 000 023 748 725 652 694 646 4 × 2 = 0 + 0.000 000 047 497 451 305 389 292 8;
  • 7) 0.000 000 047 497 451 305 389 292 8 × 2 = 0 + 0.000 000 094 994 902 610 778 585 6;
  • 8) 0.000 000 094 994 902 610 778 585 6 × 2 = 0 + 0.000 000 189 989 805 221 557 171 2;
  • 9) 0.000 000 189 989 805 221 557 171 2 × 2 = 0 + 0.000 000 379 979 610 443 114 342 4;
  • 10) 0.000 000 379 979 610 443 114 342 4 × 2 = 0 + 0.000 000 759 959 220 886 228 684 8;
  • 11) 0.000 000 759 959 220 886 228 684 8 × 2 = 0 + 0.000 001 519 918 441 772 457 369 6;
  • 12) 0.000 001 519 918 441 772 457 369 6 × 2 = 0 + 0.000 003 039 836 883 544 914 739 2;
  • 13) 0.000 003 039 836 883 544 914 739 2 × 2 = 0 + 0.000 006 079 673 767 089 829 478 4;
  • 14) 0.000 006 079 673 767 089 829 478 4 × 2 = 0 + 0.000 012 159 347 534 179 658 956 8;
  • 15) 0.000 012 159 347 534 179 658 956 8 × 2 = 0 + 0.000 024 318 695 068 359 317 913 6;
  • 16) 0.000 024 318 695 068 359 317 913 6 × 2 = 0 + 0.000 048 637 390 136 718 635 827 2;
  • 17) 0.000 048 637 390 136 718 635 827 2 × 2 = 0 + 0.000 097 274 780 273 437 271 654 4;
  • 18) 0.000 097 274 780 273 437 271 654 4 × 2 = 0 + 0.000 194 549 560 546 874 543 308 8;
  • 19) 0.000 194 549 560 546 874 543 308 8 × 2 = 0 + 0.000 389 099 121 093 749 086 617 6;
  • 20) 0.000 389 099 121 093 749 086 617 6 × 2 = 0 + 0.000 778 198 242 187 498 173 235 2;
  • 21) 0.000 778 198 242 187 498 173 235 2 × 2 = 0 + 0.001 556 396 484 374 996 346 470 4;
  • 22) 0.001 556 396 484 374 996 346 470 4 × 2 = 0 + 0.003 112 792 968 749 992 692 940 8;
  • 23) 0.003 112 792 968 749 992 692 940 8 × 2 = 0 + 0.006 225 585 937 499 985 385 881 6;
  • 24) 0.006 225 585 937 499 985 385 881 6 × 2 = 0 + 0.012 451 171 874 999 970 771 763 2;
  • 25) 0.012 451 171 874 999 970 771 763 2 × 2 = 0 + 0.024 902 343 749 999 941 543 526 4;
  • 26) 0.024 902 343 749 999 941 543 526 4 × 2 = 0 + 0.049 804 687 499 999 883 087 052 8;
  • 27) 0.049 804 687 499 999 883 087 052 8 × 2 = 0 + 0.099 609 374 999 999 766 174 105 6;
  • 28) 0.099 609 374 999 999 766 174 105 6 × 2 = 0 + 0.199 218 749 999 999 532 348 211 2;
  • 29) 0.199 218 749 999 999 532 348 211 2 × 2 = 0 + 0.398 437 499 999 999 064 696 422 4;
  • 30) 0.398 437 499 999 999 064 696 422 4 × 2 = 0 + 0.796 874 999 999 998 129 392 844 8;
  • 31) 0.796 874 999 999 998 129 392 844 8 × 2 = 1 + 0.593 749 999 999 996 258 785 689 6;
  • 32) 0.593 749 999 999 996 258 785 689 6 × 2 = 1 + 0.187 499 999 999 992 517 571 379 2;
  • 33) 0.187 499 999 999 992 517 571 379 2 × 2 = 0 + 0.374 999 999 999 985 035 142 758 4;
  • 34) 0.374 999 999 999 985 035 142 758 4 × 2 = 0 + 0.749 999 999 999 970 070 285 516 8;
  • 35) 0.749 999 999 999 970 070 285 516 8 × 2 = 1 + 0.499 999 999 999 940 140 571 033 6;
  • 36) 0.499 999 999 999 940 140 571 033 6 × 2 = 0 + 0.999 999 999 999 880 281 142 067 2;
  • 37) 0.999 999 999 999 880 281 142 067 2 × 2 = 1 + 0.999 999 999 999 760 562 284 134 4;
  • 38) 0.999 999 999 999 760 562 284 134 4 × 2 = 1 + 0.999 999 999 999 521 124 568 268 8;
  • 39) 0.999 999 999 999 521 124 568 268 8 × 2 = 1 + 0.999 999 999 999 042 249 136 537 6;
  • 40) 0.999 999 999 999 042 249 136 537 6 × 2 = 1 + 0.999 999 999 998 084 498 273 075 2;
  • 41) 0.999 999 999 998 084 498 273 075 2 × 2 = 1 + 0.999 999 999 996 168 996 546 150 4;
  • 42) 0.999 999 999 996 168 996 546 150 4 × 2 = 1 + 0.999 999 999 992 337 993 092 300 8;
  • 43) 0.999 999 999 992 337 993 092 300 8 × 2 = 1 + 0.999 999 999 984 675 986 184 601 6;
  • 44) 0.999 999 999 984 675 986 184 601 6 × 2 = 1 + 0.999 999 999 969 351 972 369 203 2;
  • 45) 0.999 999 999 969 351 972 369 203 2 × 2 = 1 + 0.999 999 999 938 703 944 738 406 4;
  • 46) 0.999 999 999 938 703 944 738 406 4 × 2 = 1 + 0.999 999 999 877 407 889 476 812 8;
  • 47) 0.999 999 999 877 407 889 476 812 8 × 2 = 1 + 0.999 999 999 754 815 778 953 625 6;
  • 48) 0.999 999 999 754 815 778 953 625 6 × 2 = 1 + 0.999 999 999 509 631 557 907 251 2;
  • 49) 0.999 999 999 509 631 557 907 251 2 × 2 = 1 + 0.999 999 999 019 263 115 814 502 4;
  • 50) 0.999 999 999 019 263 115 814 502 4 × 2 = 1 + 0.999 999 998 038 526 231 629 004 8;
  • 51) 0.999 999 998 038 526 231 629 004 8 × 2 = 1 + 0.999 999 996 077 052 463 258 009 6;
  • 52) 0.999 999 996 077 052 463 258 009 6 × 2 = 1 + 0.999 999 992 154 104 926 516 019 2;
  • 53) 0.999 999 992 154 104 926 516 019 2 × 2 = 1 + 0.999 999 984 308 209 853 032 038 4;
  • 54) 0.999 999 984 308 209 853 032 038 4 × 2 = 1 + 0.999 999 968 616 419 706 064 076 8;

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:


0.000 000 000 742 147 676 646 707 7(10) =

0.0000 0000 0000 0000 0000 0000 0000 0011 0010 1111 1111 1111 1111 11(2)

6. Positive number before normalization:

0.000 000 000 742 147 676 646 707 7(10) =

0.0000 0000 0000 0000 0000 0000 0000 0011 0010 1111 1111 1111 1111 11(2)

7. Normalize the binary representation of the number.

Shift the decimal mark 31 positions to the right, so that only one non zero digit remains to the left of it:


0.000 000 000 742 147 676 646 707 7(10) =

0.0000 0000 0000 0000 0000 0000 0000 0011 0010 1111 1111 1111 1111 11(2) =

0.0000 0000 0000 0000 0000 0000 0000 0011 0010 1111 1111 1111 1111 11(2) × 20 =

1.1001 0111 1111 1111 1111 111(2) × 2-31


8. Up to this moment, there are the following elements that would feed into the 32 bit single precision IEEE 754 binary floating point representation:

Sign 1 (a negative number)

Exponent (unadjusted): -31

Mantissa (not normalized):
1.1001 0111 1111 1111 1111 111


9. Adjust the exponent.

Use the 8 bit excess/bias notation:


Exponent (adjusted) =

Exponent (unadjusted) + 2(8-1) - 1 =

-31 + 2(8-1) - 1 =

(-31 + 127)(10) =

96(10)


10. Convert the adjusted exponent from the decimal (base 10) to 8 bit binary.

Use the same technique of repeatedly dividing by 2:


  • division = quotient + remainder;
  • 96 ÷ 2 = 48 + 0;
  • 48 ÷ 2 = 24 + 0;
  • 24 ÷ 2 = 12 + 0;
  • 12 ÷ 2 = 6 + 0;
  • 6 ÷ 2 = 3 + 0;
  • 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) =

96(10) =

0110 0000(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 23 bits, only if necessary (not the case here).


Mantissa (normalized) =

1. 100 1011 1111 1111 1111 1111 =

100 1011 1111 1111 1111 1111


13. The three elements that make up the number's 32 bit single precision IEEE 754 binary floating point representation:

Sign (1 bit) =
1 (a negative number)

Exponent (8 bits) =
0110 0000

Mantissa (23 bits) =
100 1011 1111 1111 1111 1111


Decimal number -0.000 000 000 742 147 676 646 707 7 converted to 32 bit single precision IEEE 754 binary floating point representation:

1 - 0110 0000 - 100 1011 1111 1111 1111 1111

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How to convert decimal numbers from base ten to 32 bit single precision IEEE 754 binary floating point standard

Follow the steps below to convert a base 10 decimal number to 32 bit single 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 base ten 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 of the previous dividing 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 previous multiplying operations, starting from the top of the constructed list 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, by shifting the decimal point (or if you prefer, the decimal mark) "n" positions either to the left or to the right, so that only one non zero digit remains to the left of the decimal point.
  • 7. Adjust the exponent in 8 bit excess/bias notation and then convert it from decimal (base 10) to 8 bit binary, by using the same technique of repeatedly dividing by 2, as shown above:
    Exponent (adjusted) = Exponent (unadjusted) + 2(8-1) - 1
  • 8. Normalize mantissa, remove the leading (leftmost) bit, since it's allways '1' (and the decimal sign if the case) and adjust its length to 23 bits, either by removing the excess bits from the right (losing precision...) or by adding extra '0' bits 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 -25.347 from decimal system (base ten) to 32 bit single precision IEEE 754 binary floating point:

  • 1. Start with the positive version of the number:

    |-25.347| = 25.347

  • 2. First convert the integer part, 25. Divide it repeatedly by 2, keeping track of each remainder, until we get a quotient that is equal to zero:
    • division = quotient + remainder;
    • 25 ÷ 2 = 12 + 1;
    • 12 ÷ 2 = 6 + 0;
    • 6 ÷ 2 = 3 + 0;
    • 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:

    25(10) = 1 1001(2)

  • 4. Then convert the fractional part, 0.347. 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) 0.347 × 2 = 0 + 0.694;
    • 2) 0.694 × 2 = 1 + 0.388;
    • 3) 0.388 × 2 = 0 + 0.776;
    • 4) 0.776 × 2 = 1 + 0.552;
    • 5) 0.552 × 2 = 1 + 0.104;
    • 6) 0.104 × 2 = 0 + 0.208;
    • 7) 0.208 × 2 = 0 + 0.416;
    • 8) 0.416 × 2 = 0 + 0.832;
    • 9) 0.832 × 2 = 1 + 0.664;
    • 10) 0.664 × 2 = 1 + 0.328;
    • 11) 0.328 × 2 = 0 + 0.656;
    • 12) 0.656 × 2 = 1 + 0.312;
    • 13) 0.312 × 2 = 0 + 0.624;
    • 14) 0.624 × 2 = 1 + 0.248;
    • 15) 0.248 × 2 = 0 + 0.496;
    • 16) 0.496 × 2 = 0 + 0.992;
    • 17) 0.992 × 2 = 1 + 0.984;
    • 18) 0.984 × 2 = 1 + 0.968;
    • 19) 0.968 × 2 = 1 + 0.936;
    • 20) 0.936 × 2 = 1 + 0.872;
    • 21) 0.872 × 2 = 1 + 0.744;
    • 22) 0.744 × 2 = 1 + 0.488;
    • 23) 0.488 × 2 = 0 + 0.976;
    • 24) 0.976 × 2 = 1 + 0.952;
    • We didn't get any fractional part that was equal to zero. But we had enough iterations (over Mantissa limit = 23) 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:

    0.347(10) = 0.0101 1000 1101 0100 1111 1101(2)

  • 6. Summarizing - the positive number before normalization:

    25.347(10) = 1 1001.0101 1000 1101 0100 1111 1101(2)

  • 7. Normalize the binary representation of the number, shifting the decimal point 4 positions to the left so that only one non-zero digit stays to the left of the decimal point:

    25.347(10) =
    1 1001.0101 1000 1101 0100 1111 1101(2) =
    1 1001.0101 1000 1101 0100 1111 1101(2) × 20 =
    1.1001 0101 1000 1101 0100 1111 1101(2) × 24

  • 8. Up to this moment, there are the following elements that would feed into the 32 bit single precision IEEE 754 binary floating point:

    Sign: 1 (a negative number)

    Exponent (unadjusted): 4

    Mantissa (not-normalized): 1.1001 0101 1000 1101 0100 1111 1101

  • 9. Adjust the exponent in 8 bit excess/bias notation and then convert it from decimal (base 10) to 8 bit binary (base 2), by using the same technique of repeatedly dividing it by 2, as already demonstrated above:

    Exponent (adjusted) = Exponent (unadjusted) + 2(8-1) - 1 = (4 + 127)(10) = 131(10) =
    1000 0011(2)

  • 10. Normalize the mantissa, remove the leading (leftmost) bit, since it's allways '1' (and the decimal point) and adjust its length to 23 bits, by removing the excess bits from the right (losing precision...):

    Mantissa (not-normalized): 1.1001 0101 1000 1101 0100 1111 1101

    Mantissa (normalized): 100 1010 1100 0110 1010 0111

  • Conclusion:

    Sign (1 bit) = 1 (a negative number)

    Exponent (8 bits) = 1000 0011

    Mantissa (23 bits) = 100 1010 1100 0110 1010 0111

  • Number -25.347, converted from the decimal system (base 10) to 32 bit single precision IEEE 754 binary floating point =
    1 - 1000 0011 - 100 1010 1100 0110 1010 0111