Études for Erlang

Étude 2-1: Writing a Function

Write a module with a function that takes the length and width of a rectangle and returns (yields) its area. Name the module geom, and name the function area. The function has arity 2, because it needs two pieces of information to make the calculation. In Erlang-speak: write function area/2.

Here is some sample output.

1> c(geom).
{ok,geom}
2> geom:area(3,4).
12
3> geom:area(12,7).
84

See a suggested solution in Appendix A.