#include<stdio.h>


   /* atoi:  convert s to integer */
   int atoi(char s[])
   {
       int i, n;

       n = 0;
       for (i = 0; s[i] >= '0' && s[i] <= '9'; ++i)
           n = 10 * n + (s[i] - '0');
       return n;
   }

main()
{
int n;
n=atoi("23e4");
printf("\nN je : %d\n",n);
}