/*
 * forloop3.c - omiting optional for loop elements
 */
#include <stdio.h>

int main(void)
{
  char aa;

  int counter=0;
  int sum=0;

  printf("%7s\t%3s\n", "counter", "sum");

  for(;;)
  {
    sum=(sum+2);
    printf("%4d\t%3d\n", counter, sum);
    system("sleep 1");
    counter=(counter+1);
    if (counter == 10) // run loop until counter equals 10
    {
      counter=0;
      printf("To continue press: c and then Enter\n"); // prompt for input
      printf("To exit press: x and then Enter: "); // prompt for input
      scanf("%c", &aa ); // read standard in, interpret as char, assign to memory location  of aa
      getchar(); // clear input buffer
      if (aa=='x')
      {
        return 0;
      }
    }
  }
  return 0;
}