C++ Even or Odd Number Program | CPP video Tutorial - YouTube

Hi this is Anil from Learning Lad and welcome to another video on C++ programming language.

In this video we will see how we can write a c++ program to check the integer number

entered by the user is an even number or a odd number.

So before getting started we will see what is an even number and what is a odd number.

An even number is an integer which is evenly divisible by 2.

which is nothing but let’s say n is the number and if you divide this number n by

2 and if you get the remainder as zero, then this n is an even number and if the remainder

is a non zero value then this n is the odd number.

For example if we have the number 6 here and we are going to divide this 6 by 2

So we will get 2 * 3 = 6 and the most important thing is this remainder value is zero.

So this 6 is an even number.

Similarly if we have the number let’s say 7 then we will divide this number 7 by 2.

2 * 3 = 6 and we get the remainder as 1 and since this remainder is 1, which is a non

zero value, this number 7 is odd number.

So now how we can write a C++ program to check the number entered by the user is an even

number or the odd number.

so what we're going to do is we are going to ask the user to enter the integer number.

and then we are going to divide that number by 2 and we calculate the remainder value.

if that reminder value is zero then we say that the number entered by the user is an

even number and if that remainder is a non zero value then we say that the number entered

by the user is the odd number.

so now how we can write the C++ program.

Here I have already written the Skeleton for this program.

I have included this iostream header file and I have included this STD namespace and

then we have this main function here.

So first what we're going to do is we are going to declare the variables that we are

going to need in this program.

since we are working with the integer numbers our variables are going to be of type integers.

The first variable that we need is for storing the number entered by the user to check for

even or odd.

now I will name that variable as number and then we need another variable to store the

remainder value when we divide this number by 2 and I will name that variable as remainder.

OK

now we will ask the user to enter the number.

for that I will use this cout and I will say please enter an integer number.

Ok now the next thing that we are going to do

is we are going to read the number entered by the user.

for that I will use the cin and we are going to store that in this number variable.

Ok

now we have the number to check for even or odd and the next thing that we need to do

is we need to calculate the remainder value.

so to calculate the reminder value we are going to use the modulus operator.

this modulus operator is denoted by this percentage symbol.

so Here we need to write number modulus 2.

So here what happens is it will perform number divided by 2 and it will get that remainder

value and it will return that.

This statement will give the remainder when we do number divided by 2 and then we are

going to store that remainder value in our remainder variable.

so this statement will perform number divided by 2 and whatever that remainder value we

get that will be stored in this remainder variable.

The next thing that we need to do is we need to check for the remainder variables value.

what value it is containing.

whether it is containing zero or non zero.

if it is containing a value of zero, it means the number entered by the user is an even

number.

if it is a non zero value then it means that the number entered by the user is the odd

number.

so we do that by using the if statement and the condition for this if statement will be

remainder equal to 0.

remember that I'm using the double equal to here.

this double equal to sign is used for comparing the value.

this is the comparison operator.

so what we are doing here is we are checking whether this remainder variable is containing

a value of 0.

so if this is so or if this condition is true then we will print out that the number entered

by the user is an even number.

so we will say number is an even number.

Else it means that the remainder variable is not containing the value of zero.

so we will have the else part here and we will use a cout and we say I'm going to copy

this statement and I will paste it here in this else part and I will say is a odd number.

so here we are checking the value stored in this remainder variable here.

if it is containing a value of zero then it means that the number entered by the user

is the even number and we are displaying that.

if this reminder variable is containing a non zero value, then the else part will be

executed and here we are saying that the number is odd number.

Ok

now I will save this program and I'll go to build, build and run and here it says please

enter and integer number

just made a spelling mistake here

we should have an

So i’m gonna change that one to an instead of and then I will perform this build and

run.

please enter an integer number.

I will enter the number 6 and if I hit the enter button in my keyboard it says 6 is an

even number.

ok let's close this.

Let’s run this again and this time I will enter 7.

it says 7 is a odd number.

so it means that this program is working properly.

Ok

now the thing is hereI have written this program as simple as possible.

you can write this program without using this remainder variable.

so just to show that I will remove this remainder variable here and then I will remove this

statement and here we are going to check the remainder in this if condition only.

for that I'll use parentheses then we will write that condition right here.

number Mod 2 and then have the other things as the same.

so here we are not using the remainder variable.

we are just performing the step right here in this if condition,

so what this will do is it will first calculate the remainder when the value stored in this

number variable is divided by 2 and then it will check that reminder value with zero.

whether that reminder value is 0 or not.

so if that reminder value is zero then this if condition will be executed.

else this else part will be executed.

So i’ll just save this.

build and run this.

I’ll just enter the number like 5.

it says 5 is odd number and I will run this one more time.

this time I'll enter 2.

It says e 2 is an even number.

So this is it guys.

this is how you guys can write a simple program in C++ to check the number entered by the

user is an even number or an odd number.

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thanks for watching and I'll see you later in the next video.