Home Misc Write a C program to reverse digits of a number?

Write a C program to reverse digits of a number?

by nikoo28
0 comment

ITERATIVE VERSION

The iterative version can be done in this way:-

  • Input: num
  • Initialize rev_num = 0
  • Loop while num > 0
    • Multiply rev_num by 10 and add remainder of num
      divide by 10 to rev_num
      rev_num = rev_num*10 + num%10;
    • Divide num by 10
  • Return rev_num

Here is an implementation of the same.

#include

//Iterative function to reverse digits of num
int reverseDigits(int num)
{
    int rev_num = 0;
    while(num > 0)
    {
        rev_num = rev_num*10 + num%10;
        num = num/10;
    }
    return rev_num;
}

//Driver program to test the function
int main()
{
    int num = 4562;
    printf("Reverse of no. is %d", reverseDigits(num));
    return 0;
}

RECURSIVE WAY

#include

// Recursive function to reverse digits of num
int reverseDigits(int num)
{
  static int rev_num = 0;
  static int base_pos = 1;
  if(num > 0)
  {
    reverseDigits(num/10);
    rev_num  += (num%10)*base_pos;
    base_pos *= 10;
  }
  return rev_num;
}

// Driver program to test reverseDigits
int main()
{
    int num = 4562;
    printf("Reverse of no. is %d", reverseDigits(num));
    return 0;
}

You may also like

Enclose codes in [code lang="JAVA"] [/code] tags

This site uses Akismet to reduce spam. Learn how your comment data is processed.

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More