/in/foo.c: In function 'max':
/in/foo.c:4:6: warning: variable 'c' set but not used [-Wunused-but-set-variable]
  int c;
      ^
/in/foo.c: In function 'min':
/in/foo.c:15:6: warning: variable 'z' set but not used [-Wunused-but-set-variable]
  int z;
      ^
/in/foo.c: In function 'max':
/in/foo.c:12:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.c: In function 'min':
/in/foo.c:23:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^