Is there a way to break a superordinate loop in C?

Question

Suppose you have two nested for loops like this:

int i, j;    // Iterators

for(i=0; i<100; ++i) {
     /* do some stuff */
     ...
     for(j=0; j<99; ++j) {
         /* do more stuff */
         ...
         if( someFunction(j,i) == 2 ) {
             /* break out of both loops */
         }
     }
}

Is there a way (similar to the break; command in just one loop) to end both loops on the spot?

Answer 1

You can use a goto as:

int i, j;    // Iterators

for(i=0; i<100; ++i) {
     /* do some stuff */
     ...
     for(j=0; j<99; ++j) {
         /* do more stuff */
         ...
         if( someFunction(j,i) == 2 ) {
             goto done;
         }
     }
}
done:

or use another variable to control the loop iterations:

int i, j;    // Iterators
int done = 0;
for(i=0; i<100 && !done; ++i) {
     /* do some stuff */
     ...
     for(j=0; j<99 && !done; ++j) {
         /* do more stuff */
         ...
         if( someFunction(j,i) == 2 ) {
             done = 1;
         }
     }
}

Answer 2

Our good friend goto can handle that for you!

int i, j;    // Iterators

for(i=0; i<100; ++i) {
     /* do some stuff */
     ...
     for(j=0; j<99; ++j) {
         /* do more stuff */
         ...
         if( someFunction(j,i) == 2 ) {
             /* break out of both loops */
             goto ExitLoopEarly;
         }
     }
}
goto ExitLoopNormal;

ExitLoopEarly:
....

ExitLoopNormal:
...