C program to reverse a number

December 18, 2017 admin 0 Comments

In this tutorial, we will see simple c program to reverse a number.

#include <stdio.h>

int main()

{

int num, revNum = 0, remainder;

printf("Enter a number: ");

scanf("%d", &num);

while(num != 0)

{

remainder = num%10;

revNum = revNum*10 + remainder;

num /= 10;

}

printf("Reversed Number : %d", revNum);

return 0;

}

Output:

Enter an number: 162
Reversed Number : 261

In this program, we are reversing number as follow:

Check if num is not equal to 0, in while loop
Find the remainder of num%10 which will be last digit.
We are putting last digit to first place of revNum using revNum=revNum*10+remainder
Dividing num by 10 to reduce num by one digit.
Repeat above step, until num is not equal to 0.

That’s all about C program to reverse a number.