/in/foo.cc: In function 'int main()':
/in/foo.cc:94:10: warning: unused variable 'b' [-Wunused-variable]
   int a, b, c, d;
          ^
/in/foo.cc:94:13: warning: unused variable 'c' [-Wunused-variable]
   int a, b, c, d;
             ^
/in/foo.cc:94:16: warning: unused variable 'd' [-Wunused-variable]
   int a, b, c, d;
                ^
/in/foo.cc:87:6: warning: unused variable 'temp' [-Wunused-variable]
  int temp;
      ^~~~