C++ Program to Check Palindrome Number

In this tutorial, we will learn about Palindrome numbers in C++ i.e. how to write a program to check whether a number is a Palindrome or not using C++.

Quick Info:

An integer is considered as Palindrome if the reverse of the number is equal to its original number.

For example, 121, 343, 1221, etc are the palindrome numbers.

Here’s the following steps to check palindrome:

• First, consider any number.
• Second, find the reverse of the number
• Third, check whether the reverse is equal to the number or not.

Code to check palindrome number can be performed in two ways:

• Direct method
• By Function

Palindrome Number in C++

Here’s a direct method to check a palindrome number.

Simply, the user will be asked to enter an integer then, the number is computed according to code provided and then displayed to a user.

Example:

#include<iostream.h>
#include<conio.h>
void main()
{
int num,rev=0,rem,temp;
cout<<"enter a number:=";
cin>>num;
temp=num;
while(temp>0)
{
rem=temp%10;
rev=rev*10+rem;
temp/=10;
}
cout<<"Number was:"<<num<<endl;
cout<<"Reverse is:"<<rev<<endl;
if(num==rev)
cout<<"So, number is Palindrome";
else
cout<<"So, number is not Palindrome";
getch();
}

//Output:
Enter a number 343
Number was: 343
Reverse is: 343
So, number is Palindrome

Working:

Flow of a program:

Palindrome Number Using Function

Functions are used to perform certain actions, and they are important for reusing code: Define the code once and use it many times.

And, this is a another method to check whether it is palindrome or not i.e. by function

Note: Always remember that execution starts from the main body only.

Example:

#include<iostream.h>
#include<conio.h>
int palindrome(int num)
{
int rev=0,rem,temp;
temp=num;
while(temp>0)
{
rem=temp%10;
rev=rev*10+rem;
temp=temp/10;
}
if(rev==num)
cout<<"Number is Palindrome";
else
cout<<"Number is not Palindrome";
return 0;}
int main(){
int n;
cout<<"enter any number:=";
cin>>n;
palindrome(n);
getch();
return 0;
}

//Output:
enter any number:=345
Number is not Palindrome

Working:

Flow of a program:

Well, I hope it really helped you to know C++ better.

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