/in/foo.cc: In function 'int main()':
/in/foo.cc:5:17: warning: unused variable 'j' [-Wunused-variable]
    5 |         int a,s,j,d;
      |                 ^
/in/foo.cc:6:15: warning: unused variable 'k' [-Wunused-variable]
    6 |         float k;
      |               ^
/in/foo.cc:19:16: warning: 'd' may be used uninitialized [-Wmaybe-uninitialized]
   19 |         cout<<d*100/a<<"%";
      |               ~^~~~
/in/foo.cc:5:19: note: 'd' was declared here
    5 |         int a,s,j,d;
      |                   ^