Check Prime or Armstrong Number
Check Prime and Armstrong Number
In this program, two user-defined functions check_Prime_Number() and check_Armstrong_Number() are created.
The check_Prime_Number() returns 1 if the number entered by the user is a prime number. Similarly, check_Armstrong_Number() returns 1 if the number entered by the user is an Armstrong number.
#include <stdio.h>
#include <math.h> // using maths librery
int check_Prime_Number(int number);
int check_Armstrong_Number(int number);
int main()
{
int number, flag;
printf("Enter a positive integer: ");
scanf("%d", &number);
// Check prime number
flag = check_Prime_Number(number);
if (flag == 1)
printf("%d is a prime number.\n", number);
else
printf("%d is not a prime number.\n", number);
// Check Armstrong number
flag = check_Armstrong_Number(number);
if (flag == 1)
printf("%d is an Armstrong number.",number);
else
printf("%d is not an Armstrong number.",number);
return 0;
}
int check_Prime_Number(int number)
{
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 check_Armstrong_Number(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.
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