명품 C++ Programming 실습문제 7장 5번

AP5_(1).cpp

#include <iostream>
#include <string>
using namespace std;
 
class Matrix {
    int a1, a2, a3, a4;
public:
    Matrix() {};
    Matrix(int a1, int a2, int a3, int a4) { this->a1 = a1; this->a2 = a2; this->a3 = a3; this->a4 = a4; }
    void show() {
        cout << "Matrix = { " << a1 << ' ' << a2 << ' ' << a3 << ' ' << a4 << " }\n";
    }
    Matrix operator+(Matrix b);
    Matrix operator+=(Matrix b);
    bool operator== (Matrix b);
};
 
Matrix Matrix::operator+(Matrix b) {
    Matrix tmp = *this;
    tmp.a1 = this->a1 + b.a1;
    tmp.a2 = this->a2 + b.a2;
    tmp.a3 = this->a3 + b.a3;
    tmp.a4 = this->a4 + b.a4;
    return tmp;
}
 
Matrix Matrix::operator+=(Matrix  b) {
    a1 += b.a1;
    a2 += b.a2;
    a3 += b.a3;
    a4 += b.a4;
    return *this;
}
 
bool Matrix::operator==(Matrix b) {
    if (a1 == b.a1&&a2 == b.a2&&a3 == b.a3&&a4 == b.a4) return true;
    else return false;
}
 
int main() {
    Matrix a(1, 2, 3, 4), b(2, 3, 4, 5), c;
    c = a + b;
    a += b;
    a.show(); b.show(); c.show();
    if (a == c)
        cout << "a and c are the same" << '\n';
}

AP5_(2).cpp

#include <iostream>
#include <string>
using namespace std;
 
class Matrix {
    int a1,a2,a3,a4;
public:
    Matrix() {};
    Matrix(int a1, int a2, int a3, int a4) { this->a1 = a1; this->a2 = a2; this->a3 = a3; this->a4 = a4; }
    void show() {
        cout << "Matrix = { " << a1 << ' ' << a2 << ' ' << a3 << ' ' << a4 << " }\n";
    }
    friend Matrix operator+(Matrix a, Matrix b);
    friend Matrix operator+=(Matrix a, Matrix b);
    friend bool operator== (Matrix a, Matrix b);
};
 
Matrix operator+(Matrix a, Matrix b) {
    Matrix tmp = a;
    tmp.a1 = a.a1 + b.a1;
    tmp.a2 = a.a2 + b.a2;
    tmp.a3 = a.a3 + b.a3;
    tmp.a4 = a.a4 + b.a4;
    return tmp;
}
 
Matrix operator+=(Matrix a, Matrix  b) {
    a.a1 += b.a1;
    a.a2 += b.a2;
    a.a3 += b.a3;
    a.a4 += b.a4;
    return a;
}
 
bool operator==(Matrix a, Matrix b) {
    if (a.a1 == b.a1&&a.a2 == b.a2&&a.a3 == b.a3&&a.a4 == b.a4) return true;
    else return false;
}
 
int main() {
    Matrix a(1, 2, 3, 4), b(2, 3, 4, 5), c;
    c = a + b;
    a += b;
    a.show(); b.show(); c.show();
    if (a == c)
        cout << "a and c are the same" << '\n';
}