Tue Mar 10 18:52:35 2020 

discmethod_test
  R version 3.4.4 (2018-03-15) 
  discmethod estimates the volume contained in a surface of
  revolution using the disc method.

  discmethod ( x^2,  1 , 2 ) =  19.47751
discmethod_test
  Normal end of execution.
Tue Mar 10 18:52:35 2020