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Annotation of 43BSDTahoe/usr.lib/learn/C/L12.1b, revision 1.1

1.1     ! root        1: #print
        !             2: The function getnum actually returns -1 when it
        !             3: encounters end of file. (The source is in getnum.c
        !             4: if you're interested.)
        !             5: Write, compile and run a program that
        !             6: reads numbers one per line with getnum
        !             7: and, for each, prints:
        !             8: 
        !             9: small  if the number is >0 and <=100
        !            10: big    if the number is >100 and <=1000
        !            11: huge   if the number is >1000.
        !            12: 
        !            13: Type "ready" when you're done.
        !            14: #once cp %s/getnum.o .
        !            15: #once cp %s/getnum.c .
        !            16: #once #create Ref
        !            17: 1001
        !            18: 1000
        !            19: 999
        !            20: 101
        !            21: 100
        !            22: 1
        !            23: #once #create Ref1
        !            24: huge
        !            25: big
        !            26: big
        !            27: big
        !            28: small
        !            29: small
        !            30: #user
        !            31: a.out <Ref >test
        !            32: #cmp Ref1 test
        !            33: #succeed
        !            34: /* One way:*/
        !            35: 
        !            36: main() {
        !            37:        int n;
        !            38: 
        !            39:        while ((n = getnum()) >= 0)
        !            40:                if (n > 0 && n <= 100)
        !            41:                        printf("small\n");
        !            42:                else if (n > 100 && n <= 1000)
        !            43:                        printf("big\n");
        !            44:                else if (n > 1000)
        !            45:                        printf("huge\n");
        !            46: }
        !            47: 
        !            48: /*     Notice that in principle n could be negative,
        !            49:        so we need the last case to say
        !            50:                else if (n > 1000)
        !            51:        instead of just falling into it with a bare
        !            52:                else
        !            53: 
        !            54:        Also it's a good idea to indent the else-if's
        !            55:        exactly the way they are here; otherwise
        !            56:        you'll lose track of what's going on.
        !            57: **/
        !            58: #log
        !            59: #next
        !            60: 13.1a 10

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