Problem
Statement
In
this program we will code a basic program to check whether a number is
palindrome or not in C programming language.
A
palindromic number or numeral palindrome is a number that remains the same when
its digits are reversed. Like 16461, for example, it is “symmetrical”. Hence,it
is quite clear that if a number is equal to its reversal then it is a
palindrome number.
Code
#include
bool palindrome(int n)
{
int
rem=0,rev=0,num=0;
num=n;
while(num>0)
{
rem=num%10;
rev=rev*10+rem;
num=num/10;
}
if(rev==n)
{
return true;
}
return
false;
}
int main()
{
int n;
printf("Enter
the number ?\n");
scanf("%d",&n);
if(palindrome(n))
{
printf("PALINDROME");
}
else
{
printf("NOT
A PALINDROME");
}
return 0;
}
Output
Enter
the number ? – 121
PALINDROME
Explanation
In
this problem we have to check whether the given number is a Palindrome or not.
FINDING
THE REVERSE OF A NUMBER
Let us consider an example :
Suppose we have to find the reverse of 535,we require three steps which needs
to be performed under while loop condition (while n>0).
1 : Finding Remainder : rem=num%10
So, rem=535%10=5
2 : Finding Reverse : rev=rev*10+rem
So, rev=0+5
3 : Updating number : num=num/10;
So, num=53
But num>0, so we will perform above steps until ‘num’ gets equal to
zero.After the last iteration we find rev=535.
PALINDROME
CHECKER
Now
we can check whether the reverse of a number is equal to itself or not.In this
case,535 is a Palindrome Number.
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