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+//Example 3.9

+clc;

+clear;

+close;

+format('v',9);

+//Given data :

+g=9.81;//gravity

+GH=4;//meter

+IJ=4;//meter

+IC=2;//meter

+GC=3;//meter

+AG=(10-4)/2;//meter

+BH=(10-4)/2;//meter

+EI=AG*IC/GC;//meter

+JF=AG*IC/GC;//meter

+EF=EI+IJ+JF;//meter

+A=(8+4)/2*2;//in m^2

+a=4;//meter

+b=8;//meter

+d=2;//meter

+xbar=(2*a+b)/(a+b)*d/3;//in meter

+w=g*1000;//in N/m^3

+p_gate=w*A*xbar/10^3;//in kN

+disp(p_gate,"Total pressure in kN : ");

+IG=(a^2+4*a*b+b^2)/(a+b)*d^3/36;//in m^3

+h_bar=IG/A/xbar+xbar;//in meter

+disp("Depth of centre of pressure is "+string(h_bar)+" meter.");