/* atoi example */
#include <stdio.h>      /* printf, fgets */
#include <stdlib.h>     /* atoi */

int main ()
{
  int i;
  char buffer[256];
  printf ("Enter a number: ");
  fgets (buffer, 256, stdin);
  i = atoi (&buffer[0]);
  printf ("The value entered is %d. Its double is %d.\n",i,i*2);
  return 0;
}