C++输入流位置的小变动对程序的影响

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#include<iostream>using namespace std;int main(){    char cl;    int i = cl;    cin >> cl;    cout << "The ASCII code for " << cl << " is ";    cout << i << endl;    cout << "Add one to the charecter code:" << endl;    cl = cl + 1;    i = cl;    cout << "The ASCII code for " << cl << " is ";    cout << i << endl;    cout << "Displaying char c using count.put(cl): ";    cout.put(cl);    cout << "!" << endl << "Done";    return 0;}

注意将 int i = cl; 和 cin >> cl; 对调，如下

#include<iostream>using namespace std;int main(){    char cl;    cin >> cl;    int i = cl;    cout << "The ASCII code for " << cl << " is ";    cout << i << endl;    cout << "Add one to the charecter code:" << endl;    cl = cl + 1;    i = cl;    cout << "The ASCII code for " << cl << " is ";    cout << i << endl;    cout << "Displaying char c using count.put(cl): ";    cout.put(cl);    cout << "!" << endl << "Done";    return 0;}

这里写图片描述

分析后觉得是 i 放在前面，int 定义的 i 没被输入流输入的 cl 赋值所致

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