C++ Program - Check whether a Number is Palindrome or not


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A number is known as a Palindrome number if the reverse of the number is same as the number. For example, 121 is a palindrome number, but 123 is is not a palindrome number.

Example: Check Palindrome Number

In the below example, the number called MyNum is checked for palindrome number. The MyNum is first stored in a variable called Num. A while loop is used on this variable to perform following operations:

  • last digit of the Num variable is estimated using Num % 10 and stored in digit variable.
  • reverse number is built using revNum * 10 + digit.
  • last digit is removed from Num variable using Num / 10.

Finally, MyNum is compared with revNum to check whether the number is palindrome or not.

#include <iostream>
using namespace std;

static void Palindrome(int);

static void Palindrome(int MyNum) {
    int revNum = 0;
    int Num = MyNum;
    while(Num > 0){
      int digit = Num % 10;
      revNum = revNum * 10 + digit;
      Num = Num / 10;
    }
    if (MyNum == revNum){
      cout<<MyNum<<" is a Palindrome number.\n";
    }
    else{
      cout<<MyNum<<" is not a Palindrome number.\n";
    }
}

int main() {
  Palindrome(12521);
  Palindrome(9779);
  Palindrome(1000);
  return 0;
}

Output

12521 is a Palindrome number.
9779 is a Palindrome number.
1000 is not a Palindrome number.



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