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