CODEWITHSUNDEEP
c
Garhoogin
Garhoogin

Reputation: 91

Confusing for... while loop syntax in C

I accidentally noticed that the following snipped of code compiles under GCC:

void myFunction(void) {
    int i, y = 0;
    for (i = 0; i < 10; i++)
        y++;
    while (y);
}

I've never encountered such a piece of code before and wasn't able to find any information about such a construct after doing some searching around. It leads me to wonder what the purpose of such a construct is and what it is meant to do?

Upvotes: 0

Views: 89

Answers (1)

Gerhardh
Gerhardh

Reputation: 12404

There is no such thing as a for ... while loop.

What you see are two independent loops.

First, there is a for loop. The only instruction in the body of that loop is y++;.

Then you see anoter loop: while(y) ;. That is not related at all to the for loop. The body only consists of an empty instruction ;. As y never changes in the body, that will be an infinite loop.

Upvotes: 6

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