Classical C++ Program Examples

NB: These programs are compiled by dev C++ 5.11 compiler.

     

Example : A simple C++ program to display the (static) message.

#include<iostream>
using namespace std;
	
int main()
{
   cout <<"Welcome U All";
}
//-----------------------------  OR  ----------------------------
#include<iostream>
using namespace std;
	
int main(void)
{
   cout <<"Welcome U All";
}

Example : A simple C++ program to display the message in two separate lines.

#include<iostream>
using namespace std;
	
int main()
{
   cout <<"Welcome U All"<<"\n"<<"In Codershelpline.com";
}

//-----------------------------  OR  ----------------------------
#include<iostream>
using namespace std;
	
int main()
{
   cout <<"Welcome U All"<<endl<<"In Codershelpline.com";
}

Output:
Welcome U All
In Codershelpline.com

Example : A simple C++ program to display the dynamic or user given message.

#include<iostream>
using namespace std;
	
int main()
{
	char uname [30];
	//clrscr();
	cout<<"Enter User Name: = ";
	cin>>uname;
	cout<<"User Name is : " <<uname;
        
        return 0;
}

//-----------------------------  OR  ----------------------------
#include<iostream>
using namespace std;	
int main()
{
	string Str;    // Not use String Str;
	Str = "Raman Kumar";
	cout << Str << endl;
	Str = "Sarika Kumari";
	cout << Str << endl;
     return 0;
}

Output :
Raman Kumar
Sarika Kumari

Example : A simple C++ program to display the single accepted numerical value from the user.

#include<iostream>
using namespace std;
int main()
{    
    int num;
    cout <<"Enter single integer value: ";
    cin >> num;
    cout <<"You entered " << num <<" "<<"value.";    
    return 0;
}

Output :
Enter single integer value: 25
You entered 25 value.

Example : A simple C++ program to display the multiple accepted numerical value.

#include<iostream>
using namespace std;

int main ()
{
	int num1, num2;
	//clrscr();
	cout<<"Enter two integer numbers :";
	cin>>num1>>num2;
	cout<<"Entered numbers are : " ;
	cout <<num1<<"\t"<<num2;	
    return 0;
}

Example : A simple C++ program to display the initialization and calculation of those  numerical  values.

#include<iostream>
using namespace std;
	
int main()
{
	int a=5;      // initialize variable a with value = 5
	int b(2);     // initialize variable b with value = 2
	int result;   // here initial value undetermined
	
	result = a + b;
	cout << result;
     return 0;
}
Output :
7

Example : A simple C++ program to display the sum/addition of two values.

#include<iostream>
using namespace std;

int main ()
{
    int a,b,sum;
    cout<<"Enter first number\n";
    cin>>a;
    cout<<"Enter second number\n";
    cin>>b;
    sum=a+b;
    cout<<"Sum of two number = "<<sum;	   	
  return 0;
}

Output :
Enter first number
20
Enter second number
30
Sum of two number = 50

Example : Write a program in C++ to swap two number with the help of third variable.

#include<iostream>
using namespace std;

int main ()
{
   	int a,b,c;
	cout<<"Enter the first number :\n";
	cin>>a;
	cout<<"Enter the second number :\n";
	cin>>b;
	
	c=a;
	a=b;
	b=c;
	
	cout<<"The first value after swapping is :" <<a;
	cout<<"\nThe second value after swapping is : "<<b;	   	
   return 0;
}
Output :
Enter the first number :
62
Enter the second number :
35
The first value after swapping is :35
The second value after swapping is : 62

Example : Write a program in C++ to swap two number without the help of third variable.

#include<iostream>
using namespace std;

int main ()
{
   	int a,b,c;
	cout<<"Enter the first number :\n";
	cin>>a;
	cout<<"Enter the second number :\n";
	cin>>b;
	
	a=a+b;
	b=a-b;
	a=a-b;
	
	cout<<"The first value after swapping is :" <<a;
	cout<<"\nThe second value after swapping is : "<<b;	   	
    return 0;
}

Example : A simple C++ program to display the calculation result using macro concept.

#include<iostream>
using namespace std;

#define PI 3.14159
#define NEWLINE '\n'

int main ()
{
	double r = 5.3; 
	double circle;
	circle = 2 * PI * r;
	cout << circle;
	cout << NEWLINE;	
   return 0;
}
Output :
33.3009

Example : A C++ program to check whether the given no. is odd or even.

#include<iostream>
using namespace std;

int main()
{
    int num;
    cout<<"Enter an Integer Value : ";
    cin>>num;
    if (num % 2 == 0)
        cout << num << " is even no.";
    else
        cout << num << " is odd no.";
    return 0;
}

Example : A C++ program to create simple calculator using switch case statement.

#include<iostream>
using namespace std;
int main()
{
    char choice;
    int num1, num2;
    cout << "Press plus/minus/multiply/division symbol from keyword to use calculator : ";
    cin >> choice;
    cout << "Enter two values : ";
    cin >> num1 >> num2;
    switch(choice)
    {
        case '+':
            cout << "Addition result is : ";
	    cout << num1+num2;
            break;
        case '-':
            cout << "Subtraction result is : ";
	    cout << num1-num2;
            break;
        case '*':
            cout << "Multiplication result is : ";
            cout << num1*num2;
            break;
        case '/':
            cout << "Division result is : ";
	    cout << num1/num2;
            break;
        default:            
            cout << "Error! given operator is not correct, re-enter again ";
            break;
    }
    return 0;
}

Example : A C++ program to check whether the given value is palindrome or not.

#include<iostream>
using namespace std;
int main()
{
     int num2, num1, digit, rev = 0;
     cout << "Enter a number: ";
     cin >> num1;     
     num2 = num1;     
     do
     {
         digit = num1 % 10;
         rev = (rev * 10) + digit;
         num1 = num1 / 10;
     } while (num1 != 0);
     
     cout << " The reverse of the given number is: " << rev << endl;
     if (num2 == rev)
         cout << " The given number is a palindrome.";
     else
         cout << " The given number is not a palindrome.";
    return 0;
}

Example : A C++ program to check whether the given value is prime or not.

#include<iostream>
using namespace std;

int main()
{
  int x=0,num, i; 
  cout << "Enter a positive integer value : ";
  cin >> num;
  
  for(i=2; i <= num/2; ++i)
  {
      if(num % i == 0)
      {
          x = 1;
          break;
      }
  }
  if (x==0)
      cout << "Given no. is prime number";
  else
      cout << "Given no is not a prime number";
  return 0;
}