c++ - 使用空格取消简单循环

Question

这是我完成这个简单任务的代码:

Write the code that will read character input from the user until a blank (a space) is entered. Print how many characters were entered. Keep in mind the user may decide to enter a blank as his first character.

为什么空格没有结束循环？

#include <iostream>
using namespace std;

int main(){
char answer;
int count=1;


do{
    cout << "please enter number " << count;
    cin >> answer;
    count++;

}while(answer!=' ');
    cout << "you entered " << count-1 << "numbers." << endl;
    return 0;
}

Answer 1

默认情况下，cin >> 操作会跳过所有类型的空格。您可以使用 cin >> noskipws;在循环之前禁用空格跳过或使用 cin.get()相反:

cin.get(answer);

你应该知道现在不再跳过换行和回车，所以你必须单独处理它们。此外，您应该检查流状态以对文件结尾作出 react :

do {
    cout << "Please enter number " << count << endl;
    do {
        cin.get(answer);
    } while (cin && (answer == '\r' || answer == '\n'));
    count++;
} while (cin && answer != ' ');