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Annotation of 42BSD/usr.lib/learn/C/L40.1a, revision 1.1

1.1     ! root        1: #print
        !             2: Write a subroutine
        !             3:        errmess(n)
        !             4: which looks at its argument and prints
        !             5: one of the following messages:
        !             6:   n     message (follow it by a newline)
        !             7:   1       ?
        !             8:   2       syntax error
        !             9:   3       bad syntax error
        !            10:   4       fatal error
        !            11:   5       I give up.
        !            12: anything else  eh?
        !            13: Leave the routine on errmess.c, compiled and tested
        !            14: as usual.  Then type "ready".
        !            15: #once #create Ref
        !            16: eh?
        !            17: eh?
        !            18: I give up.
        !            19: fatal error
        !            20: bad syntax error
        !            21: syntax error
        !            22: ?
        !            23: #once #create tzaqc.c
        !            24: main()
        !            25: {
        !            26:        errmess (23069);
        !            27:        errmess (-2000);
        !            28:        errmess (5);
        !            29:        errmess (4);
        !            30:        errmess (3);
        !            31:        errmess (2);
        !            32:        errmess (1);
        !            33: }
        !            34: #user
        !            35: cc tzaqc.c errmess.o
        !            36: a.out >xxx
        !            37: #cmp Ref xxx
        !            38: #succeed
        !            39: /*  a possible solution */
        !            40: char *message[] = {
        !            41:        "eh?",
        !            42:        "?",
        !            43:        "syntax error",
        !            44:        "bad syntax error",
        !            45:        "fatal error",
        !            46:        "I give up.",
        !            47:        };
        !            48: errmess(n)
        !            49: {
        !            50:        if (n < 0 || n > 5)
        !            51:                n = 0;
        !            52:        printf("%s\n", message[n]);
        !            53: }
        !            54: #log
        !            55: #next
        !            56: 41.1a 10

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