for循环，循环一次比它有 [英] for loop , loops one more time than it have to

问题描述

我正在编写一个简单的短C ++代码，并且for循环循环一个比它（使用代码::块开发）：

I'm working on a simple short C++ code and the for loop is looping one more than it have to (developed using code::blocks):

#include <iostream>
using namespace std;

int main() {
    int x = 0;
    for (x=10; x<20; x++);
    cout<<x;
    return 0;
}

输出是20，但据我所知，它必须是19

The out put is 20 but as far as I know it has to be 19.

图片链接： https://drive.google.com/file/d/0B9WsVzm6FTagbC1uNHpMZ1p6SW8/edit?usp=sharing

推荐答案

x< 20 是必须满足的条件，以便保持在循环内，这意味着您只会在 x> = 20 ，所以当你到达 x = 19 时，你仍然会重复一次，因为 19< 20 。

x < 20 is the condition that must be met in order to stay inside the loop, which means that you'll only exit the loop when x >= 20, so when you reach x = 19 you'll still iterate one more time because 19 < 20.

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