foo.cc: In function ‘int main()’:
foo.cc:4:29: warning: variable ‘z’ set but not used [-Wunused-but-set-variable]
    4 |         int a, b, c ,x ,y , z ;
      |                             ^
foo.cc:47:28: warning: ‘x’ may be used uninitialized [-Wmaybe-uninitialized]
   47 |         cout <<y << " " << x<<endl;
      |                            ^
foo.cc:4:22: note: ‘x’ was declared here
    4 |         int a, b, c ,x ,y , z ;
      |                      ^
foo.cc:47:21: warning: ‘y’ may be used uninitialized [-Wmaybe-uninitialized]
   47 |         cout <<y << " " << x<<endl;
      |                     ^~~
foo.cc:4:25: note: ‘y’ was declared here
    4 |         int a, b, c ,x ,y , z ;
      |                         ^