[C/C++] Example / Vector Class

"CVector.h"

//
//  CVector.h
//
//  Created by gchoi on 2014. 5. 9..
//  Copyright (c) 2014년 gchoi. All rights reserved.
//

#ifndef Test_005_CVector_h
#define Test_005_CVector_h

#include <iostream>
using std::istream;
using std::ostream;

class Vector
{
private:
    double* Vec;    // Elements of vector
    int Len;       // Length of vector
   
public:
    Vector( int N = 1, double Value = 0.0 );
    Vector( double Array[], int N );
    Vector( const Vector& );
    ~Vector();
   
    void reset() { Len = 0; }
    unsigned length() const { return Len; }
    double maximum() const;
    double minimum() const;
    double sum() const;
    double mean() const;
    double deviation() const;
   
    Vector operator + (const Vector& f);
    Vector operator - (const Vector& f);
    Vector& operator = (const Vector& );
   
    double& operator[]( int I ) { return Vec[I]; }
    const double& operator[]( int I ) const { return Vec[I]; }
   
    friend ostream& operator<<( ostream&, const Vector& );
    friend istream& operator>>( istream&, Vector& );
};

#endif

"CVector.cpp"

//
//  CVector.cpp
//
//  Created by gchoi on 2014. 5. 9..
//  Copyright (c) 2014년 gchoi. All rights reserved.
//

#include <cmath>
#include "CVector.h"

Vector::Vector(int N, double Value) // N개 원소를 value로 초기화
{
    Len = N;
    Vec = new double[Len];
    for(int i = 0 ; i < Len ; i++)
        Vec[i] = Value;
}

Vector::Vector(double Array[], int N) // Array배열 원소 이용 5개 원소로 초기화
{
    Len = N;
    Vec = new double[Len];
    for(int i = 0 ; i < Len ; i++)
        Vec[i] = Array[i];
}

Vector::Vector(const Vector& f) // 복사 생성자
{
    Len = f.Len;
    Vec = new double[Len];
    for(int i = 0 ; i < Len ; i++)
        Vec[i] = f.Vec[i];
}

Vector::~Vector() // 소멸자
{
    delete[] Vec;
}

Vector& Vector::operator = (const Vector& f) // '=' 연산자 오버로딩
{
    delete[] Vec;
    Len = f.Len;
    Vec = new double[Len];
    for(int i = 0 ; i < Len ; i++)
        Vec[i] = f.Vec[i];
    return (*this);
}

double Vector::maximum() const  // 최대값 리턴
{
    double max = 0.0;
    for(int i = 0 ; i < Len ; i++)
        if(max < Vec[i])
            max = Vec[i];
    return max;
}

double Vector::minimum() const  // 최소값 리턴
{
    double min = Vec[0];
    for(int i = 0 ; i < Len ; i++)
        if(min > Vec[i])
            min = Vec[i];
    return min;
}

double Vector::sum() const        // 원소들의 합 리턴
{
    double add = 0.0;
    for(int i = 0 ; i < Len ; i++)
        add += Vec[i];
    return add;
}

double Vector::mean() const      // 평균값 리턴
{
    return sum() / Len;
}

double Vector::deviation() const  // 표준편차 리턴
{
    double temp = 0.0;
    double avg = mean();
    for(int i = 0 ; i < Len ; i++)
        temp += pow(Vec[i], 2);
    return sqrt(temp / Len - pow(avg, 2));
}

Vector Vector::operator+( const Vector& f)
{
    if(f.Len != Len)
        exit(1);
    Vector temp(Len, 0.0);
    for(int i = 0 ; i < f.Len ; i++)
        temp.Vec[i] = f.Vec[i] + Vec[i];
    return temp;
}

Vector Vector::operator-( const Vector& f)
{
    if(f.Len != Len)
        exit(1);
    Vector temp(Len, 0.0);
    for(int i = 0 ; i < f.Len ; i++)
        temp.Vec[i] = Vec[i] - f.Vec[i];
    return temp;
}

ostream& operator << (ostream& os, const Vector& f)
{
    for(int i = 0 ; i < f.Len ; i++)
        os << f.Vec[i] << ' ';
    return os;
}

istream& operator >> (istream& is, Vector& f)
{
    for(int i = 0 ; i < f.Len ; i++)
        is >> f.Vec[i];
    return is;
}

"main.cpp"

//
//  main.cpp
//
//  Created by gchoi on 2014. 5. 9..
//  Copyright (c) 2014년 gchoi. All rights reserved.
//

#include <iostream>
#include "CVector.h"

using namespace std;

int main()
{
    double A[] = { 1, 2, 3, 4, 5 };
    Vector B(A, 5);
    Vector C(B);
    Vector D = B + C;
   
    cout << B << endl;
    cout << C << endl;
    cout << D << endl;
   
    return 0;
}