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  1. #include <stddef.h>
  2. #include <float.h>
  3. #include <stdlib.h>
  4. #include <stdio.h>
  5.  
  6. double frexp10( double x, int * exp )
  7. {
  8.     double tmp = .0 > x ? -x : x;
  9.     *exp = 0;
  10.  
  11.     if( x == .0 )
  12.         return x;
  13.  
  14.     if( tmp >= 10. ) {
  15.  
  16.         *exp = 1;
  17.         for( ; !( ( tmp /= 10. ) < 10. ); ++( *exp ) );
  18.  
  19.     } else if( ! ( tmp >= 1. ) ) {
  20.  
  21.         *exp = -1;
  22.         for( ; !( ( tmp *= 10. ) > 1. ); --( *exp) );
  23.     }
  24.  
  25.     return .0 > x ? -tmp : tmp;
  26. }
  27.  
  28. int main( void )
  29. {
  30.     double input = 1234567890;
  31.     double result = .0;
  32.     int exp = 0;
  33.     int i = 0;
  34.  
  35.     for( ; i < 16; input /= 10, ++i ) {
  36.  
  37.         printf( "input = %20lf   ", input );
  38.         result = frexp10( input, &exp );
  39.         printf( "result = %011.10lf x 10^%d\n", result, exp );    
  40.     }
  41.  
  42.     return EXIT_SUCCESS;
  43. }
  44.  
Success #stdin #stdout 0.01s 1676KB
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stdin
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Standard input is empty
stdout
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input =    1234567890.000000   result = 1.2345678900 x 10^9
input =     123456789.000000   result = 1.2345678900 x 10^8
input =      12345678.900000   result = 1.2345678900 x 10^7
input =       1234567.890000   result = 1.2345678900 x 10^6
input =        123456.789000   result = 1.2345678900 x 10^5
input =         12345.678900   result = 1.2345678900 x 10^4
input =          1234.567890   result = 1.2345678900 x 10^3
input =           123.456789   result = 1.2345678900 x 10^2
input =            12.345679   result = 1.2345678900 x 10^1
input =             1.234568   result = 1.2345678900 x 10^0
input =             0.123457   result = 1.2345678900 x 10^-1
input =             0.012346   result = 1.2345678900 x 10^-2
input =             0.001235   result = 1.2345678900 x 10^-3
input =             0.000123   result = 1.2345678900 x 10^-4
input =             0.000012   result = 1.2345678900 x 10^-5
input =             0.000001   result = 1.2345678900 x 10^-6
https://ideone.com/HAhiSp
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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