foo.cc: In function 'int main()':
foo.cc:11:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   else 
   ^~~~
foo.cc:13:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
    y=y+1;
    ^
foo.cc:15:8: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<y<<endl;
        ^