If-Else Program Examples

Example : A C++ program to check whether the given no. is odd or even. Number is given as per user’s choice.

#include <iostream>
using namespace std;
int main()
{	
	int choice = 1;
	while(choice == 1 )
	{
		int a;
		cout << "Enter a number to check Even or Odd" << endl;
		cin >> a;
		//check whether number is even or odd
		if( a%2 == 0 )
		{
			cout << "The given number is Even" << endl;
		}
		else
		{
			cout << "The given number is Odd" << endl;
		}
		cout << "Do U Want to check more values : Press 1 for Yes and 0 for No" << endl;
		cin >> choice;
	}
	cout << "I hope you checked all your numbers, Thank You" << endl;
	return 0;
}
Output :
Enter a number to check Even or Odd
12
The given number is Even
Do U Want to check more values : Press 1 for Yes and 0 for No
1
Enter a number to check Even or Odd
25
The given number is Odd
Do U Want to check more values : Press 1 for Yes and 0 for No
0
I hope you checked all your numbers, Thank You

Example : A C++ program to check whether the given no. is +ive, -ive or zero.

# include <iostream>
using namespace std;

int main ()
{
   int number;
    cout << "Enter a numeric value : \n";
    cin >> number;
    // checks if the number is positive
    if ( number > 0) 
        {
          cout << "The entered numeric value is Positive: " << number << endl;
        }
    // checks if the number is negative
    else if ( number < 0)
	{
          cout << "The entered numeric value is Negative: " << number << endl;
        }
    else
	{
          cout << "The entered numeric value is Zero: " << number << endl;
        }   	
return 0;
}

Example : A C++ program to display the largest value among three values.

# include <iostream>
using namespace std;
int main ()
{
   int n1, n2, n3;
    cout << "Enter three different numbers: ";
    cin >> n1 >> n2 >> n3;
    
    if(n1==n2 || n2==n3)
    {
        cout << "Two numbers are equal : \n" << n2;        
    }
        
    if(n1>=n2 && n1>=n3)
    {
        cout << "Largest number is : \n" << n1;
    }
    
    if(n2>=n1 && n2>=n3)
    {
        cout << "Largest number is : \n" << n2;
    }
    
    if(n3>=n1 && n3>=n2) 
    {
        cout << "Largest number is : \n" << n3;
    }   	
return 0;
}

------------  OR  ------------
# include <iostream>
using namespace std;

int main ()
{
   int n1, n2, n3;
   cout << "Enter three different numbers: ";
   cin >> n1 >> n2 >> n3;
    
    if(n1>n2)
	{
          if(n1>n3)
            {
              cout << "Largest number is : \n" << n1;	
	    }
	  else
	    {
	      cout << "Largest number is : \n" << n3;	
	    }		        
        }
    else
	{
	  if(n2>n3)
	      {
        	cout << "Largest number is : \n" << n2;	
	      }
	  else
	      {
		cout << "Largest number is : \n" << n3;	
	      }		
	}	   	
return 0;
}