定义一个类vector,用运算符重载的方法实现向量的相加减及其输出

（为了方便编程，设向量均为三个元素且均为整数）。

class CVector{
private:
int a,b,c;
public:
CVector(int A,int B,int C):a(A),b(B),c(C){};
~CVecotr(){};
friend CVector operator+(const CVector& left,const CVector& right);
friend CVector operator-(const CVector& left,const CVecor& right);
friend ostream& operator<<(ostream& out,const CVector& right);
};

CVector operator+(const CVector& left,const CVector& right){
return CVector(left.a+right.a,left.b+right.b,left.c+right.c);
}

CVector operator-(const CVector& left,const CVector& right){
return CVector(left.a-right.a,left.b-right.b,left.c-right.c);
}

ostream& operator<<(ostream& out,const CVector& right){
return out<<right.a<<right.b<<right.c<<endl;
}

基本模型大概就这样了