Question

c++编程 总是出现error LNK2001: unresolved external symbol _main Debug/Vehicle.exe : fatal error LNK1

#include<iostream>
using namespace std;
class Vehicle
{
public:
double Speed,Weigh;
public:
void SetVehicle(double a,double b)
{
Speed=a;
Weigh=b;
}
double GetSpeed(){return Speed;}
double GetWeigh(){return Weigh;}
void Print()
{
cout<<"汽车的速度为："<<Speed<<endl;
cout<<"汽车的载重为："<<Weigh<<endl;
}
};
class Truck:public Vehicle
{
int Load;
public:
void SetTruck(int c)
{Load=c;}
double ratio()
{
return Load/(Load+Weigh);
}
void Print()
{
cout<<"汽车的载重量为："<<Load<<endl;
cout<<"汽车的载重效率为："<<ratio<<endl;
}
};
int mian()
{
double s,m,n;
Vehicle x;
cout<<"汽车的一些基本情况为："<<endl;
cin>>s>>m;
x.SetVehicle(s,m);
x.Print();
Truck y;
cout<<"卡车的基本情况为："<<endl;
cin>>n;
y.SetTruck(n);
y.Print();
return 0;
}

Answer 1

你的main写成mian了。

追问

double ratio()
{
return Load/(Load+Weigh);
}
和
void Print()
{
cout<<"汽车的载重量为："<<Load<<endl;
cout<<"汽车的载重效率为："<<ratio<<endl;
}
载重效率ratio这个成员函数怎么结果都是1？我该怎么改？？

追答

修改后如下：
#include
using namespace std;
class Vehicle
{
public:
double Speed,Weigh;
public:
void SetVehicle(double a,double b)
{
Speed=a;
Weigh=b;
}
double GetSpeed(){return Speed;}
double GetWeigh(){return Weigh;}
void Print()
{
cout>s>>m;
x.SetVehicle(s,m);
x.Print();
Truck y;
cout>n>>r;
y.SetTruck(n,r);
y.Print();
return 0;
}

Answer 2

欢迎采纳：
建议修改如下：
把int mian() 改成 int main()

追问

double ratio()
{
return Load/(Load+Weigh);
}
和
void Print()
{
cout<<"汽车的载重量为："<<Load<<endl;
cout<<"汽车的载重效率为："<<ratio<<endl;
}
载重效率ratio这个成员函数怎么结果都是1？我该怎么改？？
赞同
1

追答

修改好了
#include
using namespace std;
class Vehicle
{
public:
double Speed,Weigh;
public:
void SetVehicle(double a,double b)
{
Speed=a;
Weigh=b;
}
double GetSpeed(){return Speed;}
double GetWeigh(){return Weigh;}
virtual void Print()
{
cout>s>>m;
x.SetVehicle(s,m);
x.Vehicle::Print();
cout>n;
x.SetTruck(n);
x.Print();
return 0;
}

Answer 3

main