Example

       #include <stdio.h>
       #include <string.h>

       main()
       {

           static char s1buf[] = "abcdefghijkl lkjihgfedcba";

           int i;

           char *status;

       /*  This program checks the strchr function by incrementally   */
       /*  going through a string that ascends to the middle and then */
       /*  descends towards the end.                                  */

           for (i = 0; s1buf[i] != '\0' && s1buf[i] != ' '; i++) {
               status = strchr(s1buf, s1buf[i]);

       /* Check for pointer to leftmost character - test 1.           */

               if (status != &s1buf[i])
                   printf("error in strchr");
           }
       }