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Wednesday, 17 April 2013

C code to check a number is palindrome or not

Calculate Palindrome in C:
Take first digit using modulo(%) by 10 in every loop and add it into (previous calculated number*10) and remove first digit using divide(/) by 10.

C program:

#include<stdio.h>

int reverse(int  number)
{
 int reverse = 0;
 int temp;
 while(number != 0)
 {
   temp=number%10;
   reverse = reverse*10 + temp;
   number = number/10;
  }         
  return reverse;
}

void main()

{
int number=1221;
int check;

check=reverse(number);
if(check==number)
printf("\nNumber is palindrome");
else
printf("Number is not palindrome");
getch();
}

Example of the following C program:

if number is 545.
1. first loop:
temp=545%10=5;
reverse= 0*10+5=5;
number=545/10=54;

2. second loop:
temp=54%10=4;
reverse=5*10+4=54;
number=54/10=5;

3. Third and last loop:
temp=5%10=5;
reverse=54*10+5=545;
number=5/10=0;

Output:

Palindrome-in-c
Palindrome code Result

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