Example

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

       main()
       {
           static char lookin[]="that this is a test was at the end";

           putchar('\n');
           printf("String: %s\n", &lookin[0] );
           putchar('\n');
           printf("Addr: %s\n", &lookin[0] );
           printf("this: %s\n", strstr( &lookin[0] ,"this") );
           printf("that: %s\n", strstr( &lookin[0] , "that" ) );
           printf("NULL: %s\n", strstr( &lookin[0], "" ) );
           printf("was: %s\n", strstr( &lookin[0], "was" ) );
           printf("at: %s\n", strstr( &lookin[0], "at" ) );
           printf("the end: %s\n", strstr( &lookin[0], "the end") );
           putchar('\n');

           exit(0);
       }

   This example produces the following results:

   $ RUN STRSTR_EXAMPLE
   String: that this is a test was at the end
   Addr: that this is a test was at the end
   this: this is a test was at the end
   that: that this is a test was at the end
   NULL: that this is a test was at the end
   was: was at the end
   at: at this is a test was at the end
   the end: the end
   $