Category: C++

#include < iostream >
using namespace std;
class myclass {
    int x;
public:
    myclass(int n = 0){ x = n; }
    int getx() { return x; }
};

int main()
{
    myclass o1(10);
    myclass o2;

cout << "o1: " << o1.getx() << '\n';
cout << "o2: " << o2.getx() << '\n';

    return 0;
}

#include < iostream >
using namespace std;

void swapargs(int &x, int &y);

int main()
{
    int i, j;
    
    i = 10;
    j = 19;
    
    cout << "i: " << i << ", ";
    cout << "j: " << j << "\n";
    
    swapargs(i, j);
    
    cout << "after exchange: ";
    cout << "i: " << i << ", ";
    cout << "j: " << j << "\n";
    
    return 0;
}

void swapargs(int &x, int &y)
{
    int t;
    
    t = x;
    x = y;
    y = t;
}

#include < iostream >
using namespace std;

int main()
{
    int *p;
    
    p = new int [5];
    
    if(!p) {
        cout << "memory set error\n";
        return 1;
    }
    
    int i;
    
    for(i=0; i<5; i++) p[i] = i;
    
    for(i=0; i<5; i++){
        cout << "integer type p[" << i << "]is: ";
        cout << p[i] << "\n";
    }
    
    delete [] p;
    
    return 0;
}

#include < iostream >
using namespace std;

int main()
{
    int *p;
    
    p = new int(9);
    
    if(!p) {
        cout << "memory set error\n";
        return 1;
    }
    
    cout << "p set integer is: " << *p << "\n";
    
    delete p;
    
    return 0;
}

#include 
using namespace std;

class samp {
    int i, j;
public:
    void set_ij(int a, int b){ i=a; j=b; }
    int get_product() { return i*j; }
};

int main()
{
    samp *p;
    
    p = new samp;
    if(!p){
        cout << "memory set error\n";
        return 1;
    }
    
    p->set_ij(4, 5);
    cout << "multiply is :" << p->get_product() << "\n";
    delete p;
    return 0;
}

#include < iostream >
using namespace std;

int main()
{
    int *p;
    
    p = new int;
    if(!p) {
        cout << "memory set error\n";
        return 1;
    }
    
    *p = 1000;
    cout << "p point integer is: " << *p << "\n";
    delete p;
    return 0;
}

#include < iostream >
using namespace std;

class samp {
    int a, b;
public:
    samp(int n, int m){ a = n; b = m; }
    int get_a() { return a; }
    int get_b() { return b; }
};

int main()
{
    samp ob[4][2] = {
        samp(1, 2), samp(3, 4),
        samp(5, 6), samp(7, 8),
        samp(9, 10), samp(11, 12),
        samp(13, 14), samp(15, 16)
    };
    
    int i;
    
    for(i = 0; i<4; i++){
        cout << ob[i][0].get_a() << ' ';
        cout << ob[i][0].get_b() << "\n";
        cout << ob[i][1].get_a() << ' ';
        cout << ob[i][1].get_b() << "\n";
        
    }
    cout << "\n";
    return 0;
}

#include < iostream >
using namespace std;

class samp {
    int a;
public:
    samp(int n){ a = n; }
    int get_a() { return a; }
};

int main()
{
    samp ob[4][2] = {
        1, 2,
        3, 4,
        5, 6,
        7, 8
    };
    int i;
    
    for (i=0; i<4; i++){
        cout << ob[i][0].get_a() << ' ';
        cout << ob[i][1].get_a() << "\n";
    }
    cout << "\n";
    
    return 0;
}

#include 
using namespace std;

class samp {
    int a;
public:
    samp(int n){ a = n; }
    int get_a() { return a; }
};

int main()
{
    samp ob[4] = { -1, -2, -3, -4 };
    int i;
    
    for(i=0; i<4; i++) cout << ob[i].get_a() << ' ';
    cout << "\n";
    
    return 0;
}

オブジェクトは変数であり、他の型の変数と同じ機能と属性を持っています。

#include < iostream >
using namespace std;

class samp {
    int a;
public:
    void set_a(int n) { a = n; }
    int get_a() { return a; }
};

int main()
{
    samp ob[4];
    int i;
    
    for(i=0; i<4; i++) ob[i].set_a(i);
    for(i=0; i<4; i++) cout << ob[i].get_a();
    
    cout << "\n";
    
    return 0;
}