question in getint

This is a discussion on question in getint within the C Programming forums, part of the General Programming Boards category; Hello all. I am trying to figure out how ? affects the code. Can someone please help? Thank you in ...

  1. #1
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    question in getint

    Hello all. I am trying to figure out how ? affects the code.
    Can someone please help?
    Thank you in advance.

    Code:
    #include <stdio.h>
    
    #define BUFSIZE 100
    
    char buf[BUFSIZE];      /* buffer for ungetch */
    int bufp = 0;           /* next free position in buf */
    
    int getch(void)         /* get a (possibly pushed-back) character */
    {
            return (bufp > 0) ? buf[--bufp] : getchar(); // ? does what??? 
    }
    
    void ungetch(int c)     /* push character back on input */
    {
            if (bufp >= BUFSIZE)
                    printf("ungetch: too many characters\n");
            else
                    buf[bufp++] = c;
    }

  2. #2
    & the hat of GPL slaying Thantos's Avatar
    Join Date
    Sep 2001
    Posts
    5,681
    the ? is a short form of an if

    <condition> ? true : false;

    so say I had
    Code:
    5 > 0 ? printf("Wee") : printf("ohhh");
    8 < 0 ? printf("Ahhh") : printf("Hehe");
    It would print Wee and then Hehe.

    You can also use it for assignments
    Code:
    x = y > z ? y : z;
    Which will assign to x the higher value between y and z.

  3. #3
    Registered User
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    Jan 2004
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    Thank you very much for your quick response!

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