2. Classes cont. Function overload.

#include <cstdlib>  // Standard General Utilities Library
#include <iostream> // Input output stream
#include <ctime>    // for random number generation
#include <stdio.h>  // printf library
#include <string>
#include <limits>   // cin.ignore(numeric_limits<streamsize>::max(),'\n');
#include <fstream>  // File input and output.
#include <cmath>    // pow.
#include <cstring>
using namespace std;

// Classes
class num {
private:
    int a, b;
public:
    void print();
    void assign(int, int);
    int sum();
    num();
    num(int);
    num(int, int);

};

// Methods
num::num() {
    a = 1;
    b = 2;
}
num::num(int var) {
    a = var;
    b = var;
}

num::num(int var1, int var2) {
    a = var1;
    b = var2;
}

void num::assign(int var1, int var2) {
    a = var1;
    b = var2;
}
int num::sum() {
    return a + b;
}

void num::print() {
    cout << sum() << endl;
}

// Function prototypes

// Main program
int main(int argc, char *argv[]) {

    num A;
    num B(4);
    num C(5, 10);
    num D;
    D.assign(2, 8);

    A.print();
    B.print();
    C.print();
    D.print();

    cout << " " << endl;
    return 0;
}