#include <string.h>
#include <stdio.h>                  /* for printf */
void tst_strchr (void) {
   char * s;
   char buf [] = "This is a test";
   s = strchr (buf, 't');
   if (s != NULL)
      printf ("found a 't' at %s\n", s);
}

   void tst_strpos (void) {
   char text [] = "Search this string for blanks";
   int i;
   i = strpos (text, ' ');
   if (i == -1)
      printf ("No spaces found in %s\n", text);
   else
      printf ("Found a space at offset %d\n", i);
}