Thread: Why is this not printing to screen?

this is my code:

Code:

#include <stdio.h>
#include <stdlib.h>
#include<math.h>

int main (void)
{
	int n;
	FILE * input;

	input = fopen("input.txt", "r");
	fscanf(input, "%d", &n);



	 if(n == 2)
                   printf("%d is prime", n);
          else if(n % 2 == 0 || n < 2)
                   printf("no, %d is prime!", &n);
          else
          {
                   int x;
                   for(x = 0; x < (int)sqrt((double)n); x++)
                                if(n % x == 0)
                                {
                                         printf("no, %d is not prime", &n);
                                         return;
                                }
                   printf("yes, %d is prime!", &n);
		  }


	if(n % 7 == 0)
		printf("Yes, %d is a multiple of 7",&n);
	if(n % 11 == 0)
		printf("Yes, %d is a multiple of 11",&n);
	if(n % 13 == 0)
		printf("Yes, %d is a multiple of 13",&n);
	else
		printf("No, %d is not a multiple of 7, 11, or 13",&n);


	if(n % 2 == 0)
		printf("%d is even", &n);
	else 
		printf("%d is odd", &n);


	fclose(input);
	

	return 0;


}

Let me know what you think thanks