Question

How to check where a number is special number in C

Answer 1

// Special number = sum of the factorial of digits is equal to the number

#include <stdio.h>
#include <stdbool.h>

int factorial(int num) {
    int fact = 1;
 
    while (num != 0) {
        fact = fact * num;
        num--;
    }
 
    return fact;
}
 
bool isSpecial(int num) {
    int sum = 0, tmp = num;
 
    while (tmp != 0) {
        sum += factorial(tmp % 10);
        tmp = tmp / 10;
    }
 
    return sum == num;
}
 
int main() 
{
    int num = 145; // 1! + 4! + 5! = 1 + 24 + 120 = 145
 
    if (isSpecial(num)) {
        puts("yes");
    }
    else {
        puts("no");
    }
}
 
 
 
 
/*
run:
  
yes
  
*/

 

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