Question

C++unreferenced local variable 新手不会怎么改

#include<iostream>
using namespace std;
class Cub
{
public:
void set_date() //输入函数
{
cout<<"请输入长方体的长 宽 高：";
cin>>l>>w>>h;
}
void display() //输出三边
{
cout<<"长宽高分别是："<<l<<","<<w<<","<<h<<endl;
}
double vol() //计算体积
{
return l*w*h;
}
double area() //计算表面积
{
double s;
s=2*(l*w+w*h+h*l);
return s;
}
private:
double l,w,h;
};
int main()
{
Cub s1;
cout<<s1.set_date<<"\n";
cout<<s1.display<<"\n";
cout<<"体积"<<s1.vol<<"\n";
cout<<"表面积"<<s1.area<<"\n";
return 0;
//在此插入语句，实现说明一个长方体，输入它的长宽高，输出长宽高、体积、表面积。
}

Answer 1

private:
double l,w,h;
改成public:试试