如何退出嵌套循环 [英] how to exit nested loops

问题描述

我有类似的东西

   while(playAgain==true)
   {
      cout<<"new game"<<endl; //i know 'using namespace std;' is looked down upon
      while(playerCard!=21)
      {
          *statements*
          if(decision=='n')
          {
              break
          }
       ...
      }
   }

但是当我想从两个循环中都退出时，该中断只会从第一个while循环中退出

but that break only breaks out of the first while loop when I want to break out of both of the loops

推荐答案

不要煮意大利面 ，然后将循环提取到函数中:

Don't cook spaghetti and extract your loops into the function:

void foo(...) {
    while (...) {
        /* some code... */
        while (...) {
            if ( /* this loop should stop */ )
                break;
            if ( /* both loops should stop */ )
                return;
        }
        /* more code... */
    }
}

这种分解还将产生更简洁的代码，因为您将在不同的抽象级别拥有整齐的函数，而不是数百行的丑陋的过程代码.

this decomposition will also yield cleaner code since instead of hundreds of lines of ugly procedural code, you will have neat functions at different levels of abstraction.

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