foo.cc: In function 'int main()':
foo.cc:6:17: warning: unused variable 'leap' [-Wunused-variable]
    6 |         int x,y,leap=0;cin>>x;
      |                 ^~~~
foo.cc:12:15: warning: 'y' may be used uninitialized [-Wmaybe-uninitialized]
   12 |         cout<<y;
      |               ^
foo.cc:6:15: note: 'y' was declared here
    6 |         int x,y,leap=0;cin>>x;
      |               ^

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