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

/* #include "math.h"  */

double
math(int argc, char **argv)
{
  /* Converts the input values from string to integer */
  double val1 = atof(argv[1]);
  double val2 = atof(argv[3]);
   
  switch (argv[2][0])  /* switch to select the appropriate math function based on the operator */
    {
      
    case('+'):
      return val1 + val2;
      break;
      
    case('-'):
      return val1 - val2;
      break;
      
    case ('/'):
      /* printf("%f\n", (float)val1/(float)val2); */
      /* zero_check(val2); */
      return val1 / val2;

      break;
      
    case ('x'):
      return val1 * val2;
      break;
      
    case('%'):
      /* if ((zero_check(val2)) == 1) */
      /* 	{ */
      /* 	  return 1; */
      /* 	} */
      return (int)val1 %  (int)val2;
      break;
   } 
  
   return 0; /* den här raden ska inte kunna exekveras om allt har gjorts rätt */
             /* men kompilatorn kräver den ändå */
}




