pat1.c

// Write a C program to check whether a number is prime, armstrong, perfect number or not using functions.

// Input:

// 11

// Output:

// 11 is prime number
// 11 is not a armstrong number
// 11 is not a perfect number



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

bool isPrime(int num) {
    if (num <= 1) {
        return false;
    }

    for (int i = 2; i < num; i++) {
        if (num % i == 0) {
            return false;
        }
    }

    return true;
}

bool isArmstrong(int num) {
    int sum = 0, r, temp = num;

    while (temp > 0) {
        r = temp % 10;
        sum += (r * r * r);
        temp /= 10;
    }

    return (num == sum);
}

bool isPerfect(int num) {
    int sum = 0;

    for (int i = 1; i < num; i++) {
        if (num % i == 0) {
            sum += i;
        }
    }

    return (num == sum);
}

int main() {
    int num;
    scanf("%d", &num);

    if (isPrime(num)) {
        printf("%d is prime number\n", num);
    } else {
        printf("%d is not prime number\n", num);
    }

    if (isArmstrong(num)) {
        printf("%d is a armstrong number\n", num);
    } else {
        printf("%d is not a armstrong number\n", num);
    }
    
    if (isPerfect(num)) {
        printf("%d is a perfect number\n", num);
    } else {
        printf("%d is not a perfect number\n", num);
    }

    return 0;
}