Question

write a program to accept a number and check whether it is even number, prime number or Armstrong number on the user's choice and call different methods to check the above-mentioned​

Answer 1

Answer:

an Armstrong number or not

Example: Check Prime and Armstrong

#include <math.h>

#include <stdio.h>

int checkPrimeNumber(int n);

int checkArmstrongNumber(int n);

int main() {

int n, flag;

printf("Enter a positive integer: ");

scanf("%d", &n);

// check prime number

flag = checkPrimeNumber(n);

if (flag == 1)

printf("%d is a prime number.\n", n);

else

printf("%d is not a prime number.\n", n);

// check Armstrong number

flag = checkArmstrongNumber(n);

if (flag == 1)

printf("%d is an Armstrong number.", n);

else

printf("%d is not an Armstrong number.", n);

return 0;