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#include"pch.h"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
using namespace std;
class Vector
{
private:
double *v;
int len;
public:
Vector(int size);
Vector(double *, int);
~Vector();
double &operator[](int i);
Vector & operator =(Vector &);
friend Vector operator +(Vector &, Vector &);
friend Vector operator -(Vector &, Vector &);
friend double operator *(Vector &, Vector &);
friend ostream & operator <<(ostream &output, Vector &);
friend istream & operator >>(istream &input, Vector &);
};
Vector::Vector(int size)
{
if (size <= 0 || size >= 2147483647)
{
cout << "The size of " << size << "is overflow!\n";
abort();
}
v = new double[size];
for (int i = 0; i < size; i++) v[i] = 0;
len = size;
}
Vector::Vector(double *C, int size)
{
if (size <= 0 || size >= 2147483647)
{
cout << "The size of" << size << "is overflow!\n" << endl;
abort();
}
v = new double[size];
len = size;
for (int i = 0; i < len; i++) v[i] = C[i];
}
Vector::~Vector()
{
delete[]v;
v = NULL; len = 0;
}
double &Vector::operator[](int i)
{
if (i >= 0 && i < len)
return v[i];
else
{
cout << "The size of" << i << "is overflow!\n";
abort();
}
}
Vector &Vector::operator =(Vector &C)
{
if (len == C.len)
{
for (int i = 0; i < len; i++)
v[i] = C[i];
return *this;
}
else
{
cout << "Operator = fail!\n";
abort();
}
}
Vector operator +(Vector &A, Vector &B)
{
int size = A.len;
double *T = new double[size];
if (size == B.len)
{
for (int i = 0; i < size; i++)
T[i] = A[i] + B[i];
return Vector(T, size);
}
else
{
cout << "Operator + fail!\n";
abort();
}
}
Vector operator -(Vector &A, Vector &B)
{
int size = A.len;
double *T = new double[size];
if (size == B.len)
{
for (int i = 0; i < size; i++)
T[i] = A[i] - B[i];
return Vector(T, size);
}
else
{
cout << "Operator - fail!\n";
abort();
}
}
double operator *(Vector &A, Vector &B)
{
int size = A.len;
double s = 0;
if (size == B.len)
{
for (int i = 0; i < size; i++)
s += A[i] * B[i];
return s;
}
else
{
cout << "Operator * fail!\n";
abort();
}
}
ostream & operator <<(ostream &output, Vector &A)
{
int i;
output << '(';
for (i = 0; i < A.len - 1; i++)
output << A[i] << ',';
output << A[i] << ')';
return output;
}
istream & operator >>(istream &input, Vector &A)
{
for (int i = 0; i < A.len; i++)
input >> A[i];
return input;
}
int main()
{
int k1, k2, k3; double t;
cout << "Input the length of Vector A:\n";
cin >> k1;
Vector A(k1);
cout << "Input the elements of Vector A:\n";
cin >> A;
cout << "Input the length of Vector B:\n";
cin >> k2;
Vector B(k2);
cout << "Input the elements of Vector B:\n";
cin >> B;
cout << "Input the length of Vector C:\n";
cin >> k3;
Vector C(k3);
cout << "A=" << A << endl;
cout << "B=" << B << endl;
C = A + B;
cout << "A+B=" << A << "+" << B << "=" << C << endl;
C = A - B;
cout << "A-B=" << A << "-" << B << "=" << C << endl;
t = A * B;
cout << "A*B=" << A << "*" << B << "=" << t << endl;
}
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