立即退出 C++ 中的“while”循环
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Immediate exit of 'while' loop in C++
提问by Meir
How do I exit a whileloop immediately without going to the end of the block?
如何while立即退出循环而不去到块的末尾？
For example,
例如，
while (choice != 99)
{
cin >> choice;
if (choice == 99)
//Exit here and don't get additional input
cin>>gNum;
}
Any ideas?
有任何想法吗？
回答by Andomar
Use break?
使用休息？
while(choice!=99)
{
cin>>choice;
if (choice==99)
break;
cin>>gNum;
}
回答by akappa
cin >> choice;
while(choice!=99) {
cin>>gNum;
cin >> choice
}
You don't need a break, in that case.
在这种情况下，您不需要休息。
回答by Elben Shira
回答by Danny Battison
Yes, break will work. However, you may find that many programmers prefer not to use it when possible, rather, use a conditional if statement to perform anything else in the loop (thus, not performing it and exiting the loop cleanly)
是的，休息会起作用。但是，您可能会发现许多程序员在可能的情况下不喜欢使用它，而是使用条件 if 语句在循环中执行任何其他操作（因此，不执行它并干净地退出循环）
Something like this will achieve what you're looking for, without having to use a break.
这样的事情将实现您正在寻找的东西，而无需休息。
while(choice!=99) {
cin >> choice;
if (choice != 99) {
cin>>gNum;
}
}
回答by Charlie Martin
break;.
break;.
while(choice!=99)
{
cin>>choice;
if (choice==99)
break;
cin>>gNum;
}
回答by Remus Rusanu
hmm, break?
嗯，break？
回答by Will Hartung
while(choice!=99)
{
cin>>choice;
if (choice==99)
exit(0);
cin>>gNum;
}
Trust me, that will exit the loop. If that doesn't work nothing will. Mind, this may not be what you want...
相信我，这将退出循环。如果那不起作用，什么都不会。注意，这可能不是你想要的......
回答by Chris Stryker
Yah Im pretty sure you just put
是的，我很确定你只是把
break;
right where you want it to exit
就在你希望它退出的地方
like
喜欢
if (variable == 1)
{
//do something
}
else
{
//exit
break;
}
回答by Dario
Try
尝试
break;
回答by AlbertS
You should never use a break statement to exit a loop. Of course you can do it, but that doesn't mean you should. It just isn't good programming practice. The more elegant way to exit is the following:
您永远不应该使用 break 语句退出循环。当然你可以做到，但这并不意味着你应该这样做。这不是好的编程习惯。更优雅的退出方式如下：
while(choice!=99)
{
cin>>choice;
if (choice==99)
//exit here and don't get additional input
else
cin>>gNum;
}
if choice is 99 there is nothing else to do and the loop terminates.
如果选择为 99，则无需执行其他操作，循环终止。
