/in/foo.c: In function 'main':
/in/foo.c:6:7: warning: statement with no effect [-Wunused-value]
  for(i==2;i<n;i++)
      ~^~~
/in/foo.c:8:14: warning: format '%d' expects a matching 'int' argument [-Wformat=]
     printf("%d is a primer!");
              ^
/in/foo.c:10:15: warning: format '%d' expects a matching 'int' argument [-Wformat=]
      printf("%d is not a primer!");
               ^
/in/foo.c:12:1: error: expected declaration or statement at end of input
 }
 ^