C Program to reverse a number using the function

In this program, You will learn how to reverse a number using a function in c.

123 => 321

456 => 654

Example: How to reverse a number using a function in c.


int reverseNum(int n) {
   int r, rev = 0;

   while (n > 0) {
       r = n % 10;
       rev = rev * 10 + r;
       n = n / 10;
   return rev;

int main() {

   int n, rev = 0;

   printf("Enter a number:");
   scanf("%d", &n);

   rev = reverseNum(n);
   printf("Reverse number is:%d", rev);

   return 0;


Enter a number:123                                                                                                                     
Reverse number is:321

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