C++: Classes And Objects

Small but important programs using classes and objects

Question:13
C++ program to take input for two numbers, calculate and print their sum?
Sol:

#include <iostream>
#include<conio.h>
using namespace std;
class sum
{
private:
    int a,b,c;
public:
    void read();
    void cal();
    void show();
};
void sum::read()
{
    cout<<"Enter 2 nos ";
    cin>>a>>b;
}
void sum::cal()
{
    c=a+b;
}
void sum::show()
{
    cal();
    cout<<"Sum = "<<c<<endl;
}
int main()
{
    sum s;
    s.read();
    s.show();
    return(0);
}

/* Output */

Enter 2 nos 10
20
Sum = 30

Question:14
C++ program to take input for 3 numbers check and print the largest number.
Sol:

#include <iostream>
#include<conio.h>
using namespace std;
class largest
{
private:
    int a,b,c,m;
public:
    void read();
    void cal();
    void show();
};
void largest::read()
{
    cout<<"Enter 3 nos ";
    cin>>a>>b>>c;
}
void largest::cal()
{
    if(a>b && a>c)
        m=a;
    else
        if(b>c)
        m=b;
    else
        m=c;
}
void largest::show()
{
    cal();
    cout<<"Max no = "<<m<<endl;
}
int main()
{
    largest la;
    la.read();
    la.show();
    return(0);
}

/* Output */

Enter 3 nos 10
25
63
Max no = 63

Question:15
C++ program to take input for 2 nos, calculate and print their sum, prod and diff?
Sol:

#include <iostream>
#include<conio.h>
using namespace std;
class sample
{
private:
    int a,b,s,p,d;
public:
    void read();
    void cal();
    void show();
};
void sample::read()
{
    cout<<"Enter 2 nos ";
    cin>>a>>b;
}
void sample::cal()
{
    s=a+b;
    p=a*b;
    if(a>b)
        d=a-b;
    else
        d=b-a;
}
void sample::show()
{
    cal();
    cout<<"Sum = "<<s<<endl;
    cout<<"Prod = "<<p<<endl;
    cout<<"Diff = "<<d<<endl;
}
int main()
{
    sample s;
    s.read();
    s.show();
    return(0);
}

/* Output */

Enter 2 nos 25
63
Sum = 88
Prod = 1575
Diff = 38

Question:16
C++ program to take input for a number calculate and print its square and cube?
Sol:

#include <iostream>
#include<conio.h>
using namespace std;
class sample
{
private:
    int n,s,c;
public:
    void read();
    void cal();
    void show();
};
void sample::read()
{
    cout<<"Enter any no ";
    cin>>n;
}
void sample::cal()
{
    s=n*n;
    c=n*n*n;
}
void sample::show()
{
    cal();
    cout<<"Square = "<<s<<endl;
    cout<<"Cube = "<<c<<endl;
}
int main()
{
    sample s;
    s.read();
    s.show();
    return(0);
}

/* Output */

Enter any no 5
Square = 25
Cube = 125