/in/foo.c: In function 'prinme':
/in/foo.c:7:20: error: 'n' undeclared (first use in this function)
    7 |                 if(n%i==0)
      |                    ^
/in/foo.c:7:20: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c: In function 'main':
/in/foo.c:19:14: warning: implicit declaration of function 'prime'; did you mean 'prinme'? [-Wimplicit-function-declaration]
   19 |         flag=prime(num);
      |              ^~~~~
      |              prinme
/in/foo.c: In function 'prinme':
/in/foo.c:14:1: warning: control reaches end of non-void function [-Wreturn-type]
   14 | }
      | ^