/in/foo.cc: In function 'int main()':
/in/foo.cc:7:22: error: invalid operands of types 'int' and 'double' to binary 'operator%'
    7 |         cout<<ceil(20%3.14159*r*r*h);
      |                    ~~^~~~~~~~
      |                    |  |
      |                    |  double
      |                    int