c++ - 计算非负数的平均值的函数

Question

我应该允许用户输入非负数，一旦输入负数，该函数应显示后续非负数的平均值。

我正在使用 XCode 进行 C++ 工作。

int Question6(){
    double nums;
    double totalnums = 0;
    int count = 0;

    cout << "Please enter the numbers that you like to be average that are non-negative:";
    cin >> nums;

    while (nums > 0){
        cout << "Please enter the numbers that you like to be average that are non-negative:";
        cin >> nums;
        totalnums += nums;
        count += 1;

        if (nums < 0){

            cout << "You have enterd a negative number so your average is:" << (totalnums/ count) << endl;

        }

    }

    return 0;
}

我已经成功构建，但它总是给我一个包含负数的平均值。有办法阻止这种情况发生吗？

Answer 1

问题出在这里:

 while (nums > 0)
   {
        cout << "Please enter the numbers that you like to be average that are non-negative:";
        cin >> nums;
        totalnums += nums;
        count += 1;

        if (nums < 0)
            {    
            cout << "You have enterd a negative number so your average is:" << (totalnums/ count) << endl;
            }

    }

问题是 if while 中的说明环形。如果您输入负数，它会添加到您的 totalnums+=nums指令，因为它是 cin 之后的下一条指令.之后，while条件变为 false程序退出循环。

要修复您的错误，请检查 nums<0 之前您输入 while循环。