C program to display palindrome numbers in a given range

In this C Programming example, we will implement the program to display palindrome numbers in a given range and print the output on the screen.

1. Palindrome Number

A Palindrome is a word, string, number, or any sequence that reads the same forward and backward.

A Palindromic number is a number that reads the same when the digits are read backward.

Example: 121, 131, 313 ,323 ,444 ,565, 999, 11211, etc..

Helpful topics to understand this program better are-

• Operators in C
• Functions in C
• For and While loop in C

2. C program to display palindrome numbers in a given range

Let’s discuss the execution(kind of pseudocode) for the program to display palindrome numbers in a given range.

1. Initially, the program will make a call to displayPalindrome function.
2. In void displayPalindrome(int min, int max) function we iterate from min to max and pass each number to isPalindrome(i).
3. isPalindrome(i) method verifies if the current number is palindrome or not.
4. Finally, if the number is found to be a palindrome then it is printed on the console.

Let us now implement the above execution of the program to display palindrome numbers in a given range in C.

#include <stdio.h>
int isPalindrome(int number) {
  int reverse = 0;
  for (int i = number; i > 0; i /= 10)
    reverse = (reverse * 10) + (i % 10);
  return number == reverse;
}

// prints palindrome between min and max
void displayPalindrome(int min, int max) {
  for (int i = min; i <= max; i++) {
    if (isPalindrome(i)) {
      printf("%d  ", i);
    }
  }
}

int main() {
  displayPalindrome(1, 100);
  return 0;
}

Output
1  2  3  4  5  6  7  8  9  11  22  33  44  55  66  77  88  99

3. Conclusion

In this C Programming example, we have discussed what are palindrome numbers and how to display palindrome numbers in a given range.

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