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+// Exa 6.9
+format('v',6)
+clc;
+clear;
+close;
+// Given data
+h_ie = 1.5 * 10^3;// in ohm
+h_fe = 100;
+// R = R1||R2 = 20;// in k ohm
+R = 20 * 10^3;// in ohm
+R_E = 560;// in ohm
+R_S = 600;// in ohm
+Avf = (h_fe*R_E)/(h_ie+(h_fe*R_E));
+VoByVs = Avf;
+disp(VoByVs,"The value of midband voltage gain (vo/vs) is :");
+Ri = h_ie + ((1+h_fe)*R_E);// in ohm
+Ri= Ri*10^-3;// in k ohm
+disp(Ri,"The value of input impedance (Ri) in k ohm is : ")
+Ri= Ri*10^3;// in ohm
+Ro = (R_S+h_ie)/(1+h_fe);// in ohm
+disp(Ro,"The value of output impedance (Ro) in ohm is : ")
+R_desh_i = (R*Ri)/(R+Ri);// in ohm
+R_desh_i=R_desh_i*10^-3;// in k ohm 
+disp(R_desh_i,"The value of R''i in k ohm is");
+// For load resistance of 10 k ohm
+R_L = 10;// in k ohm
+R_L = R_L * 10^3;// in ohm
+R_desh_o = (Ro*R_L)/(Ro+R_L);// in ohm
+disp(R_desh_o,"The value of R''o for load resistance of 10 k ohm  in ohm is");
+// For load resistance of 220 ohm
+R_L = 220;// in ohm
+R_desh_o = (Ro*R_L)/(Ro+R_L);// in ohm
+disp(R_desh_o,"The value of R''o for load resistance of 220 ohm  in ohm is");
+
+// Note: There is a calculation mistake to evaluate the value of R_desh_i (R'i)