/in/foo.c: In function 'main':
/in/foo.c:6:23: error: expected ';' before 'for'
    6 |         scanf("%d",&n)
      |                       ^
      |                       ;
    7 |         for(i=2;i<=n-1;i++);
      |         ~~~            
/in/foo.c:13:9: error: expected declaration or statement at end of input
   13 |         printf("%d is a primer!",n);
      |         ^~~~~~