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C > Mathematics Code Examples

Program to Reverse a Number & Check if it is a Palindrome

Program to Reverse a Number & Check if it is a Palindrome

This C program accepts an integer, reverse it and also checks if it is a palindrome or not.

- Take the number which you have to reverse as the input.
- Obtain its quotient and remainder.
- Multiply the separate variable with 10 and add the obtained remainder to it.
- Do step 2 again for the quotient and step 3 for the remainder obtained in step 4.
- Repeat the process until quotient becomes zero.
- When it becomes zero, check if the reversed number is equal to original number or not.
- Print the output and exit.

    #include <stdio.h>

    void main()

    {

        int j, temp, remainder, reverse = 0;

        printf("Enter an integer \n");

        scanf("%d", &j);

        /*  original number is stored at temp */

        temp = j;

        while (j > 0)

        {

            remainder = j % 10;

            reverse = reverse * 10 + remainder;

            j /= 10;

        }

        printf("Given number is = %d\n", temp);

        printf("Its reverse is  = %d\n", reverse);

        if (temp == reverse)

            printf("Number is a palindrome \n");

        else

            printf("Number is not a palindrome \n");

    }

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