/* plus.c - Let's look at what + means in C using arrays.
 * The same concept also works for strings.
 */
#include <stdio.h>
#include <string.h>

/* before_zero - How many elements do we see in the array beore the first zero?
 * Precondition:  We assume the number 0 exists in the array.
 */
int before_zero(int a[])
{
  int i, how_many = 0;

  for (i = 0; ; ++i)
  {
    if (a[i] == 0)
      break;
    ++how_many;
  }
  return how_many;
}

main()
{
  int a[] = { 5, 4, 7, 3, 2, 0, 6, 1, 8, 9 };
  int count;
  char s[] = "ice cream";

  count = before_zero(a);
  printf("I found %d elements of a   before its first zero.\n", count);

  count = before_zero(a + 3);
  printf("I found %d elements of a+3 before its first zero.\n", count);

  printf("The length of the string s   = '%s' is %d.\n", s, strlen(s));
  printf("The length of the string s+3 = '%s' is %d.\n", s+3, strlen(s+3));
}

/* Output:
I found 5 elements of a   before its first zero.
I found 2 elements of a+3 before its first zero.
The length of the string s   = 'ice cream' is 9.
The length of the string s+3 = ' cream' is 6.
 */