/in/foo.c: In function 'main':
/in/foo.c:12:9: error: expected ';' before 'int'
         int i;
         ^~~
/in/foo.c:13:13: error: 'i' undeclared (first use in this function)
         for(i=0;i<n;i++)
             ^
/in/foo.c:13:13: note: each undeclared identifier is reported only once for each function it appears in