Card Game - V

Patrick started to play the card game - V. In this game, Patrick has to pick one card from the shuffled cards. If the card number is a Kaprekar number, then he wins the game. Patrick is unaware of Kaprekar number. Patrick decided to ask the manager about this number.

The manager explains to him that consider an n-digit number k. Square it and add the right n digits to the left n or n-1 digits. If the resultant sum is k, then k is called a Kaprekar number.

For example, 9 is a Kaprekar number since 92 = 81 & 8+1=9.

297 is a Kaprekar number since 2972 = 88209 & 88+209 = 297. Write a program to help Patrick to find whether a card number he picked is a Kaprekar number or not. Input Format: Input consists of a single integer. Output Format: Refer sample output for details. Sample Input and Output1:  Enter the card number picked up by Patrick: 9  9 is a Kaprekar Number Sample Input and Output 2: Enter the card number picked up by Patrick: 101 101 is not a Kaprekar Number Program Code: # include <stdio.h> # include <stdbool.h> # include <math.h> bool chkkaprekar(int n) { int r_digits; if (n == 1)  return true;     int sqr_n = n * n;     int ctr_digits = 0;     while (sqr_n)     {         ctr_digits++;         sqr_n /= 10;     }     sqr_n = n*n;      for (r_digits=1; r_digits<ctr_digits; r_digits++)     {          int eq_parts = pow(10, r_digits);          if (eq_parts == n)             continue;          int sum = sqr_n/eq_parts + sqr_n % eq_parts;          if (sum == n)            return true; } return false; } int main() { int kpno;   printf("Enter the card number picked up by Patrick:\n");   scanf("%d",&kpno); if (chkkaprekar(kpno)==true) { printf("%d is a Kaprekar Number",kpno); } else { printf("%d is not a Kaprekar Number",kpno); }  return 0; }