question in getint

[jongmin]

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

#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;
}

[Thantos]

the ? is a short form of an if

<condition> ? true : false;

so say I had

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

x = y > z ? y : z;

Which will assign to x the higher value between y and z.

[jongmin]

Thank you very much for your quick response!