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+// Exa 8.4
+clc;
+clear;
+close;
+format('v',6)
+// Given data
+R11 = 4;// in k ohm
+R21 = 20;// in k ohm
+h_ie = 1.1;// in k ohm
+R_C1=4;// in k ohm
+R22= 10;// in k ohm
+R12= 2;// in k ohm
+Zb = h_ie;// in k ohm
+Zin = (R11*R21*Zb)/( (R11*R21)+(R21*Zb)+(Zb*R11) );// in k ohm
+disp(Zin,"The input impedance in k ohm is");
+h_oe = 0;// unit less
+Q2 = %inf;// output impedance of transistor
+R_C2 = 2;// in k ohm
+// Zout= 1/h_oe || R_C2 = R_C2
+Zout = R_C2;// in k ohm
+disp(Zout,"The output impedance in k ohm is");
+h_fe = 50;// unit less
+R_L = 10;// in k ohm
+Av2= -h_fe/h_ie*(R_C2*R_L/(R_C2+R_L));// voltage gain of second stage
+Rac1= 1/(1/R_C1+1/R22+1/R12+1/h_ie);// in k ohm
+Av1= -h_fe/h_ie*Rac1;// voltage gain of first stage
+Av= Av1*Av2;// overall voltage gain 
+disp(Av,"The overall voltage gain is : ")
+