What is a neat way of breaking out of many for loops at once?

Question

Suppose I need to break out of three or four nested for loops at once at the occurence of some event inside the innermost loop. What is a neat way of doing that?

Answer 1

Dividing by 0 is the surest method I know that will break you out of any number of loops. This works because the DIV assembly instruction doesn't like such silliness.

So, you can try this:

int i, j, k;
int flag1 = 0;
int flag2 = 0;

for (i = 0; i < 100; i++) {
    for (j = 0; j < 100; j++) {
        for (k = 0; k < 100; k++) {
            if (k == 50) {
                flag1 = 1;
                flag2 = 1;
                int z = 1 / 0;  // we're outta here!!!
            }
        }
        if (flag1 == 1)break;
    }
    if (flag2 == 1)break;
}

Getting back from the trap that happens on such events left as an exercise for the reader (it's trivial).