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c:math.h:frexp

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c:math.h:frexp [2013/01/22 22:02] (current)
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 +{{keywords>wiki library source code example reference}}
 +===== frexp =====
 +<code c>
 +    double frexp(double);
 +</code>
 +Mantissa m. in *n is the exponent.
 +
 +===== C Sourcecode Example =====
 +compile in linux with: gcc frexp.c -o frexp **-lm** -Wall
 +<code c>     
 +#include <stdio.h> /* including standard library */
 +//#include <windows.h> /* uncomment this for Windows */
 +
 +#include <math.h> /* including math library */
 +
 +int main ( void ) 
 +{
 +  double x;
 +  int n;
 +
 +  x = 42.0;
 +  printf ("%lf * 2^%d = %f\n", frexp (x , &n), n, x);
 +  return 0;
 +}
 +
 +
 +
 +</code>
 +==== output ====
 +   output:
 +   user@host:~$ ./frexp 
 +   0.656250 * 2^0 = 42.000000
  
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c/math.h/frexp.txt · Last modified: 2013/01/22 22:02 (external edit)

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