C Program To Reverse A Number

 

C PROGRAM TO REVERSE A NUMBER

#include <stdio.h>

int main() { 
    int n, rev = 0, remainder; 
    printf("Enter an integer: "); 
    while( n != 0) {
        remainder = n % 10;
        rev = rev * 10 + remainder; 
        n /= 10;
    }

   printf("Reversed number is: %d", rev);

   return 0;

}

Output

Enter an integer: 9929
Reversed number is: 9299 

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How the program works?

• The program takes input from the scanf() function.
• Then while() loop is used until n != 0 becomes false.
  
• In each iteration of the while loop, the remainder when n is divided by 10 is calculated and the value of n is reduced by 10 times.
• In the loop, the integer is reversed using-
  

  rev = rev * 10 + remainder;

• Then printf() function, at last, returns the reversed integer.