foo.cc: In function ‘int main()’:
foo.cc:20:21: warning: unused variable ‘d’ [-Wunused-variable]
   20 |                 int d=(a*b)/c;
      |                     ^
foo.cc:22:16: warning: ‘d’ is used uninitialized [-Wuninitialized]
   22 |          cout<<d<<endl;
      |                ^
foo.cc:5:18: note: ‘d’ was declared here
    5 |         int a, b,d;
      |                  ^