foo.cc: In function ‘int main()’:
foo.cc:7:25: warning: ‘n’ is used uninitialized [-Wuninitialized]
    7 |         cout<<n-ceil(x/y);
      |                         ^
foo.cc:5:13: note: ‘n’ was declared here
    5 |         int n;
      |             ^
foo.cc:7:21: warning: ‘x’ is used uninitialized [-Wuninitialized]
    7 |         cout<<n-ceil(x/y);
      |                 ~~~~^~~~~
foo.cc:6:16: note: ‘x’ was declared here
    6 |         double x,y;
      |                ^
foo.cc:7:21: warning: ‘y’ is used uninitialized [-Wuninitialized]
    7 |         cout<<n-ceil(x/y);
      |                 ~~~~^~~~~
foo.cc:6:18: note: ‘y’ was declared here
    6 |         double x,y;
      |                  ^