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+// Exa 8.5
+clc;
+clear;
+close;
+format('v',6)
+// Given data
+R1 = 10;// in k ohm
+R2 = 5;// in k ohm
+Zb = 1;// in k ohm
+Zin = (R1*R2*Zb)/( (R1*R2)+(R2*Zb)+(Zb*R1) );// in k ohm
+disp(Zin,"The input impedance in k ohm is");
+R_C1 = 2;// in k ohm
+R_E1 = 2;// in k ohm
+R_C2 = 2;// in k ohm
+R_E2 = 2;// in k ohm
+h_oe = 0;// unit less
+Q2 = %inf;// output impedance of transistor
+//Zout= 1/h_oe || R_C2
+Zout = R_C2;// in k ohm
+disp(Zout,"The output impedance in k ohm is");
+h_fe = 100;// unit less
+h_ie = 1;// in k ohm
+R_ac=0.222;// in k ohm
+Av2= -h_fe/h_ie*R_C2;// voltage gain of second stage
+Rac1= 1/(1/R_C1+1/R1+1/R2+1/h_ie);// in k ohm
+Av1= -h_fe/h_ie*R_ac;// voltage gain of first stage
+Av= Av1*Av2;// overall voltage gain 
+disp(Av,"The overall voltage gain is : ")