c++ - 错误 : expected unqualified-id before 'while' |

Question

在第 12 行继续出现此错误

#include <iostream>

int num = 1;
int number;
int total = 0;
while (num<=5){
    cin >> number;
    total +=number;
    num++;
    cout<< total<<endl
}

Answer 1

您的代码缺少 int main(void)您的所有代码都应该在其中的函数。根据定义，C++ 程序需要有一个int main(void)。功能。您需要将所有代码放在 int main(void) 中功能。

此外，您的 cin <<和 cout <<语句缺少 namespace 标记 std:: .因此，您需要添加 std::在您使用的每个实例中 cin或 cout请看下面的代码:

#include <iostream>

int main(void) // The main() function is required in a C++ program
{
    int num = 1;
    int number;
    int total = 0;
    while (num <= 5)
    {
        std::cin >> number; // You need to add the reference to std:: as "cin <<" is a part of the std namespace
        total += number;
        num++;
        std::cout << total << std::endl // You need to add the reference to std:: as "cout <<" and "endl <<" is a part of the std namespace
    }

    return 0;
}