为什么我的变量没有初始化？

Question

我只是从c转到C++,我正在尝试构建一个计算器.Int'结果'不会通过数学运算初始化.逻辑是,根据操作'',将有一个不同的值分配给'结果'.这似乎不起作用.

#include<iostream>
#include<cstring>
#include<cmath>
using namespace std;

int main ()
{
    int n1, n2;
    char s,r;
    int result = 0;
    cout<< "Enter a calculation? (y/n)"<<endl;
    cin>>r;
    while(r=='y')
    {
        cout <<"Enter the first number"<<endl;
        cin>>n1;
        cout<<"Enter the operator"<<endl;
        cin>>s;
        cout<<"Enter the second number"<<endl;
        cin>>n2;

        if ('s' == '*')
        {
            result = n1*n2;
        }
        if ('s' =='+')
        {
            result = n1+n2;
        }

        if ('s' =='-')
        {
            result = n1-n2;
        }

        if ('s' =='/')
        {
            result = n1/n2;
        }
        cout << result<<endl;
        cout<< "Enter a calculation? (y/n)"<<endl;
        cin>>r;
    }
    return 0;
}

Answer 1

你必须与s不比较's'.所以你的代码应该是这样的

if (s == '*')
{
    result = n1*n2;
}

代码

 if ('s' == '*')

将字符s与字符进行比较,该字符's'始终为false.