打破嵌套循环的另一种方法是将两个循环分解成一个单独的函数，并在希望退出时从该函数返回。

当然，这也引发了另一个争论，即是否应该显式地从函数的任何地方返回，而不是在函数的末尾。

不，别打断我的表演。这是使用后藤的最后一个据点。

Break将只退出包含它的最内层循环。

你可以使用goto来跳出任意数量的循环。

当然，goto通常被认为是有害的。

使用break函数[…]是否合适?

使用break和goto会使判断程序的正确性变得更加困难。请看这里关于这个问题的讨论:Dijkstra不是疯子。

  while (i<n) {
    bool shouldBreakOuter = false;
    for (int j=i + 1; j<n; ++j) {
      if (someCondition) {
          shouldBreakOuter = true;
      }
    }

    if (shouldBreakOuter == true)
      break;

  }

Breaking out of a for-loop is a little strange to me, since the semantics of a for-loop typically indicate that it will execute a specified number of times. However, it's not bad in all cases; if you're searching for something in a collection and want to break after you find it, it's useful. Breaking out of nested loops, however, isn't possible in C++; it is in other languages through the use of a labeled break. You can use a label and a goto, but that might give you heartburn at night..? Seems like the best option though.

 bool found = false;
    
    for(int i=0; i < m; ++i){
        for(int j=0; j < n; ++j)
            if(grid[i][j] == '*'){
                q.push(make_pair(i,j));
                found = true;
                break;
            }
        if(found)
            break;
    }