Question

Write a c program to display the Armstrong numbers in natural numbers by using nested functions

Answer 1

A prime number or not

an Armstrong number or not

Example: Check Prime and Armstrong Number.

=> #include <stdio.h>

#include <math.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;

}

int checkPrimeNumber(int n)

{

int i, flag = 1;

for(i=2; i<=n/2; ++i)

{

// condition for non-prime number

if(n%i == 0)

{

flag = 0;

break;

}

}

return flag;

}

int checkArmstrongNumber(int number)

{

int originalNumber, remainder, result = 0, n = 0, flag;

originalNumber = number;

while (originalNumber != 0)

{

originalNumber /= 10;

++n;

}

originalNumber = number;

while (originalNumber != 0)

{

remainder = originalNumber%10;

result += pow(remainder, n);

originalNumber /= 10;

}

// condition for Armstrong number

if(result == number)

flag = 1;

else

flag = 0;

return flag;

}

:>Output:<

Enter a positive integer: 407

407 is not a prime number.

407 is an Armstrong number.