Études for Erlang

Étude 3-4: Tuples as Parameters

Add an area/1 function that takes a tuple of the form {shape,number,number} as its parameter. Export it instead of area/3. The area/1 function will call the private area/3 function.

Here is some sample output.

1> c(geom).
{ok,geom}
2> geom:area({rectangle, 7, 3}).
21
3> geom:area({triangle, 7, 3}).
10.5
4> geom:area({ellipse, 7, 3}).
65.97344572538566

See a suggested solution in Appendix A.