variable nested for loops

Question

I\'m trying to figure out how I can use recursion to do n-level nested for loops. For example, if n=3, there would be 3 \'levels\'

for(z=0;z<6;z++){
   fo         


        

Answer 1

You could write it like this, but... I wouldn't. It's confusing code and doesn't give you any benefits. If you want it because your true use case has a high number of nested loops, consider just not doing that, instead; it's a serious design smell.

void nested_loop(const int levels, const int comparator, const int level = 0, const int accumulator = 0)
{
   if (level < levels) {
      for (int i = 0; i < 6; i++) {
         nested_loop(levels, comparator, level + 1, accumulator + i);
      }
   }
   else {
      if (accumulator == comparator) {   // your if (z+y+x==f)
         //do something
      }
   }
}

int main() {
   const int levels = 3;
   const int f = 42;

   nested_loop(levels, f);
}

Live demo.