Question

Is there some way to write for loop with “double” init-expression?

vector<int> v;
//...vector filling...
for (vector<int>::iterator i = v.begin() AND vector<int>::iterator e = v.end(); i != e; ++i){ ...}

Answer 1

Yes, there is:

#include <iostream>
int main() {
  for (int i=0, j=10; i<10; ++i, ++j) {
    std::cout << i << ", " << j << "\n";
  }
}

however, the types of the variables you are initializing must be the same, since you need to use the comma operator.