numerical integration using rectangle method.

Topic:
Rectangle
This program shows how to calculate an integral using the numerical rectangle method. The parameters give the possibility to change the left and right value of the interval and the integration step. The program can be modified to use other methods for example for trapeze , just modify the calculation of aire, so modify liste4..
The program can be modified to use other methods for example for trapeze , just modify the calculation of aire, so modify liste4. do it as exercise