/in/foo.c: In function 'FindMaxs':
/in/foo.c:3:10: warning: unused variable 'num' [-Wunused-variable]
  int i,j,num=0;
          ^~~
/in/foo.c:3:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,num=0;
        ^
/in/foo.c:17:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^