exp函数

函数原型： 
 double exp (double x);

      float exp (float x);

long double exp (long double x);

     double exp (T x);           // additional overloads for integral types
示例代码：

/* exp example */

#include <stdio.h>      /* printf */

#include <math.h>       /* exp */

int main ()

{

  double param, result;

  param = 5.0;

  result = exp (param);

  printf ("The exponential value of %f is %f.\n", param, result );

  return 0;

}

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