How To Use If Statement and nested if statement in C++ Programming Language

In this post we will discuss how to use if else statement in c++ programming language.The if and else are like a coin having two faces only.If  we toss a coin then there will be only two choices one is head and other is tail and we select the one head or a tail.If statement have also two choices only one is if and other is a else. that will be selected on your condition to which one is run if or else.

The other example of if else is like a street or a road having only two ways to move forward and we select the one that is true that depends on the condition we used.This is like as

In this  example we have a point where we are standing and want to move forward and we have only one choice to select a way for us.Examples of the if else statement are given bellow.

Syntax:
                  #include<iostream>

          using namespace std;   //header files

          void main() 

         {

            if(condition)

             {

              //body of if.

             }

            else

             {

              //body of else

             }

         }//body of main.

Example 1:
Write a program to check that the given number is Even number or Odd number.

Solution:

#include<iostream>

using namespace std;   //header files

void main() 

{

       int num;  //num stand for number

      

       cout<<"Enter a number :"<<endl;   //message

      

       cin>>num; //taking input from the user.

       if(num%2==0) //this is our condition to check the even number..because every even                          //number completely divisible by 2 and give remainder 0.                          

       {

               cout<<num<<" is Even Number"<<endl;

       }

       else

       {

              cout<<num<<" is Odd Number"<<endl;

       }

   

   cout<<"\n\n\n"<<endl;  //used for next line.

       system("pause");

}//body of main.

Example 2:
Write a program to check that the given number is a Leap Year or not.

Solution:

#include<iostream>

using namespace std;   //header files

void main() 

{

       int year; 

      

       cout<<"Enter a year :"<<endl;   //message to display

      

       cin>>year; //taking input from the user.

       if(year%4==0) //this is our condition to check the leap year...because every 4 yaer                         //  after  the month of febrary is 29 days.

       {

              cout<<year<<" IS A LEAP YEAR"<<endl;

       }

       else

       {

              cout<<year<<" IS NOT A LEAP YEAR"<<endl;

       }

   

   cout<<"\n\n\n"<<endl;  //used for next line.

       system("pause");

}//body of main.
















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