/in/foo.cc: In function 'int main()':
/in/foo.cc:4:15: warning: variable 'x' set but not used [-Wunused-but-set-variable]
 long long a,b,x,y,z;
               ^
/in/foo.cc:4:19: warning: variable 'z' set but not used [-Wunused-but-set-variable]
 long long a,b,x,y,z;
                   ^