Programme des foctions

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

double my_exp(double r, double epsilon)
{
  double sum = 0.0 ;
  double term = 1.0 ;
  int i = 1 ;

  while(fabs(term) > epsilon)
    {
      /*
      printf("i = %d\tsum = %f\tterm = %f\n", i, sum, term);
      */
      sum += term ;
      term =  term * r / i ;
      i++ ;
    }
  return sum ;
}
  
void usage(char *pname)
{
  fprintf(stderr, "Usage %s argument, precision\n", pname) ;
  return ;
}

int main(int argc, char *argv[])
{
  double x, error ;

  if( 3 != argc)
    {
      usage( argv[0] ) ;
      return EXIT_FAILURE ;
    }

  sscanf(argv[1], "%lf" , &x) ;
  sscanf(argv[2], "%lf" , &error ) ;

  printf("my_exp(%lf): %lf\n", x, my_exp(x, error)) ;
  printf("exp(%lf): %lf\n", x, exp(x)) ;

  return EXIT_SUCCESS ;
}

johand@bata:~/src/CCM$ gcc -Wall -o exp -lm exp.c
johand@bata:~/src/CCM$ ./exp  -1  1E-5
my_exp(-1.000000): 0.367882
exp(-1.000000): 0.367879