/in/foo.c: In function 'isPnum':
/in/foo.c:14:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.c: In function 'main':
/in/foo.c:19:8: warning: 'count' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int n,count;
        ^~~~~