What does the colon signify in a C function?

问题

What is this use of the colon called?

The following code is taken from the book Learn Core Audio.

    int main(int argc, const char * argv[])
    {
    //...

    cleanup:
        AudioQueueDispose(queue, true);
        AudioFileClose(player.playbackFile);

        return 0;
    }

回答1:

That's a label. It's used along with a goto statement to control the flow of your program.

goto and Labeled Statements (C)

回答2:

cleanup: is a label. It can be used as the target for a goto statement.

回答3:

Cleanup is a label. You can use

goto cleanup;

In your code to redirect your execution from cleanup label.

来源：https://stackoverflow.com/questions/28389805/what-does-the-colon-signify-in-a-c-function