Thread: prime numbers re-posted

Hello everyone,

I finally figured out how to write the code I originally thought I was posting
on the weekend.

The purpose of this small program is to identify prime numbers.

It seems to work okay until a number is entered that is divisible by 11
(or an elevenish type number). Example-- 33 is identified as prime,
777 is identified as prime, etc.

Any help or comments on this code will be appreciated.

Here's the code. Thanks everyone.

Code:

#include <stdio.h>

int main(void)
{
	int number;
	printf("Enter a number:\n");
	scanf("%d", &number);

	int a;

	for(a = 2; a < number; a++)
	{
		if((number % a) == 0)
		{
		printf("%d is not prime.\n", number);
		break;		
		}
		
		
	       
		if((number % a) != 0)
		{
		printf("%d is prime.\n", number);
		break;
		}
	}

	return 0;
}