# How to reverse a number in C?

Sep 1st, 2023 To reverse a number in C programming we will be using do…while loops.

### How do you reverse a number in C?

``````#include <stdio.h>

int main() {

int n, reverse = 0, remainder;

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

while (n != 0) {
remainder = n % 10;
reverse = reverse * 10 + remainder;
n /= 10;
}

printf("Reversed number is %d", reverse);

return 0;
}``````

Explanation:

Here we are using a while loop to reverse the integer:

• `while (n != 0)` This line suggests that the loop will continue as long as the value of n is not equal to 0.
• Inside the loop:
• `remainder = n % 10` this line calculates the last digit of the integer n.
• `reverse = reverse * 10 + remainder` this line updates the `reverse` variable by appending the remainder to the end of the current reverse value.
• `n /= 10` this line removes the last digit from n by dividing it by 10. This makes `n` ready for the next iteration of the loop.
• All these will return you the reversed value of the integer in C programming language using while loops.

In conclusion, using do…while loops is the most effective method to reverse a number in C programming language.

Thanks for reading! Have a great day!