Wed Mar 11 20:40:48 2020 

shellmethod_test
  R version 3.4.4 (2018-03-15) 
  shellmethod estimates the volume contained in a surface of
  revolution using the shell method.

  shellmethod ( x^2,  0 , 1 ) =  3.613796
shellmethod_test
  Normal end of execution.
Wed Mar 11 20:40:48 2020