main(argc, argv) int argc; char *argv[]; { /* See if arguments passed ok. */ if (diff(argv[0], "t11b")) e(31); if (diff(argv[1], "abc")) e(32); if (diff(argv[2], "defghi")) e(33); if (diff(argv[3], "j")) e(34); if (argv[4] != 0) e(35); if (argc != 4) e(36); exit(75); } diff(s1, s2) char *s1, *s2; { while (1) { if (*s1 == 0 && *s2 == 0) return(0); if (*s1 != *s2) return(1); s1++; s2++; } } e(n) int n; { printf("Error %d\n", n); }