This program requires two sets of input. The first set is loading, F1 and F2. The second set is geometry —  the length of the beam L, the distance from F1 to the left support, a, and the distance between two forces, b. Reaction forces at supports are calculated; shear force and bending moment are calculated along the beam and are plotted. The maximum shear stress is calculated displayed in an output box. The input values can be modified to re-plot.