-0.000 000 000 742 147 676 646 705 9 Converted to 32 Bit Single Precision IEEE 754 Binary Floating Point Representation Standard

Convert decimal -0.000 000 000 742 147 676 646 705 9(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
-0.000 000 000 742 147 676 646 705 9(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:

|-0.000 000 000 742 147 676 646 705 9| = 0.000 000 000 742 147 676 646 705 9


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: 0.000 000 000 742 147 676 646 705 9.

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) 0.000 000 000 742 147 676 646 705 9 × 2 = 0 + 0.000 000 001 484 295 353 293 411 8;
  • 2) 0.000 000 001 484 295 353 293 411 8 × 2 = 0 + 0.000 000 002 968 590 706 586 823 6;
  • 3) 0.000 000 002 968 590 706 586 823 6 × 2 = 0 + 0.000 000 005 937 181 413 173 647 2;
  • 4) 0.000 000 005 937 181 413 173 647 2 × 2 = 0 + 0.000 000 011 874 362 826 347 294 4;
  • 5) 0.000 000 011 874 362 826 347 294 4 × 2 = 0 + 0.000 000 023 748 725 652 694 588 8;
  • 6) 0.000 000 023 748 725 652 694 588 8 × 2 = 0 + 0.000 000 047 497 451 305 389 177 6;
  • 7) 0.000 000 047 497 451 305 389 177 6 × 2 = 0 + 0.000 000 094 994 902 610 778 355 2;
  • 8) 0.000 000 094 994 902 610 778 355 2 × 2 = 0 + 0.000 000 189 989 805 221 556 710 4;
  • 9) 0.000 000 189 989 805 221 556 710 4 × 2 = 0 + 0.000 000 379 979 610 443 113 420 8;
  • 10) 0.000 000 379 979 610 443 113 420 8 × 2 = 0 + 0.000 000 759 959 220 886 226 841 6;
  • 11) 0.000 000 759 959 220 886 226 841 6 × 2 = 0 + 0.000 001 519 918 441 772 453 683 2;
  • 12) 0.000 001 519 918 441 772 453 683 2 × 2 = 0 + 0.000 003 039 836 883 544 907 366 4;
  • 13) 0.000 003 039 836 883 544 907 366 4 × 2 = 0 + 0.000 006 079 673 767 089 814 732 8;
  • 14) 0.000 006 079 673 767 089 814 732 8 × 2 = 0 + 0.000 012 159 347 534 179 629 465 6;
  • 15) 0.000 012 159 347 534 179 629 465 6 × 2 = 0 + 0.000 024 318 695 068 359 258 931 2;
  • 16) 0.000 024 318 695 068 359 258 931 2 × 2 = 0 + 0.000 048 637 390 136 718 517 862 4;
  • 17) 0.000 048 637 390 136 718 517 862 4 × 2 = 0 + 0.000 097 274 780 273 437 035 724 8;
  • 18) 0.000 097 274 780 273 437 035 724 8 × 2 = 0 + 0.000 194 549 560 546 874 071 449 6;
  • 19) 0.000 194 549 560 546 874 071 449 6 × 2 = 0 + 0.000 389 099 121 093 748 142 899 2;
  • 20) 0.000 389 099 121 093 748 142 899 2 × 2 = 0 + 0.000 778 198 242 187 496 285 798 4;
  • 21) 0.000 778 198 242 187 496 285 798 4 × 2 = 0 + 0.001 556 396 484 374 992 571 596 8;
  • 22) 0.001 556 396 484 374 992 571 596 8 × 2 = 0 + 0.003 112 792 968 749 985 143 193 6;
  • 23) 0.003 112 792 968 749 985 143 193 6 × 2 = 0 + 0.006 225 585 937 499 970 286 387 2;
  • 24) 0.006 225 585 937 499 970 286 387 2 × 2 = 0 + 0.012 451 171 874 999 940 572 774 4;
  • 25) 0.012 451 171 874 999 940 572 774 4 × 2 = 0 + 0.024 902 343 749 999 881 145 548 8;
  • 26) 0.024 902 343 749 999 881 145 548 8 × 2 = 0 + 0.049 804 687 499 999 762 291 097 6;
  • 27) 0.049 804 687 499 999 762 291 097 6 × 2 = 0 + 0.099 609 374 999 999 524 582 195 2;
  • 28) 0.099 609 374 999 999 524 582 195 2 × 2 = 0 + 0.199 218 749 999 999 049 164 390 4;
  • 29) 0.199 218 749 999 999 049 164 390 4 × 2 = 0 + 0.398 437 499 999 998 098 328 780 8;
  • 30) 0.398 437 499 999 998 098 328 780 8 × 2 = 0 + 0.796 874 999 999 996 196 657 561 6;
  • 31) 0.796 874 999 999 996 196 657 561 6 × 2 = 1 + 0.593 749 999 999 992 393 315 123 2;
  • 32) 0.593 749 999 999 992 393 315 123 2 × 2 = 1 + 0.187 499 999 999 984 786 630 246 4;
  • 33) 0.187 499 999 999 984 786 630 246 4 × 2 = 0 + 0.374 999 999 999 969 573 260 492 8;
  • 34) 0.374 999 999 999 969 573 260 492 8 × 2 = 0 + 0.749 999 999 999 939 146 520 985 6;
  • 35) 0.749 999 999 999 939 146 520 985 6 × 2 = 1 + 0.499 999 999 999 878 293 041 971 2;
  • 36) 0.499 999 999 999 878 293 041 971 2 × 2 = 0 + 0.999 999 999 999 756 586 083 942 4;
  • 37) 0.999 999 999 999 756 586 083 942 4 × 2 = 1 + 0.999 999 999 999 513 172 167 884 8;
  • 38) 0.999 999 999 999 513 172 167 884 8 × 2 = 1 + 0.999 999 999 999 026 344 335 769 6;
  • 39) 0.999 999 999 999 026 344 335 769 6 × 2 = 1 + 0.999 999 999 998 052 688 671 539 2;
  • 40) 0.999 999 999 998 052 688 671 539 2 × 2 = 1 + 0.999 999 999 996 105 377 343 078 4;
  • 41) 0.999 999 999 996 105 377 343 078 4 × 2 = 1 + 0.999 999 999 992 210 754 686 156 8;
  • 42) 0.999 999 999 992 210 754 686 156 8 × 2 = 1 + 0.999 999 999 984 421 509 372 313 6;
  • 43) 0.999 999 999 984 421 509 372 313 6 × 2 = 1 + 0.999 999 999 968 843 018 744 627 2;
  • 44) 0.999 999 999 968 843 018 744 627 2 × 2 = 1 + 0.999 999 999 937 686 037 489 254 4;
  • 45) 0.999 999 999 937 686 037 489 254 4 × 2 = 1 + 0.999 999 999 875 372 074 978 508 8;
  • 46) 0.999 999 999 875 372 074 978 508 8 × 2 = 1 + 0.999 999 999 750 744 149 957 017 6;
  • 47) 0.999 999 999 750 744 149 957 017 6 × 2 = 1 + 0.999 999 999 501 488 299 914 035 2;
  • 48) 0.999 999 999 501 488 299 914 035 2 × 2 = 1 + 0.999 999 999 002 976 599 828 070 4;
  • 49) 0.999 999 999 002 976 599 828 070 4 × 2 = 1 + 0.999 999 998 005 953 199 656 140 8;
  • 50) 0.999 999 998 005 953 199 656 140 8 × 2 = 1 + 0.999 999 996 011 906 399 312 281 6;
  • 51) 0.999 999 996 011 906 399 312 281 6 × 2 = 1 + 0.999 999 992 023 812 798 624 563 2;
  • 52) 0.999 999 992 023 812 798 624 563 2 × 2 = 1 + 0.999 999 984 047 625 597 249 126 4;
  • 53) 0.999 999 984 047 625 597 249 126 4 × 2 = 1 + 0.999 999 968 095 251 194 498 252 8;
  • 54) 0.999 999 968 095 251 194 498 252 8 × 2 = 1 + 0.999 999 936 190 502 388 996 505 6;

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:


0.000 000 000 742 147 676 646 705 9(10) =

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

6. Positive number before normalization:

0.000 000 000 742 147 676 646 705 9(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:


0.000 000 000 742 147 676 646 705 9(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 -0.000 000 000 742 147 676 646 705 9 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