/in/foo.cc: In function 'int main()':
/in/foo.cc:7:10: warning: 'y' may be used uninitialized [-Wmaybe-uninitialized]
    7 |         n=y;
      |         ~^~
/in/foo.cc:5:15: note: 'y' was declared here
    5 |         int n,y,x=0;
      |               ^