/in/foo.cc: In function 'int main()':
/in/foo.cc:5:19: warning: unused variable 'z' [-Wunused-variable]
 int a[50],i,h,x,y,z;
                   ^
/in/foo.cc:12:7: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   {y++;}
       ^