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+//chapter 5
+//example 5.2
+//page 150
+clear all;
+clc ;
+//given
+R1=68;R2=56;//kohm
+Rc=3.9;//collector resistor kohm
+Zb=2.1+(76*4.7);//input impedance
+printf("\nInput Impedance(Zb)=%.1f kohm",Zb);
+
+//circuit input impedance
+Zi=1/((1/Zb)+(1/R1)+(1/R2));
+printf("\nCircuit input impedance(Zi)=%.1f kohm",Zi);
+hfe=75;Rl=82;
+
+//circuit output impedance
+Zo=Rc;
+printf("\nCircuit output impedance(Zo)=%.1f kohm",Zo);
+
+Av=((-hfe*(Rc*Rl)/(Rc+Rl))/Zb);
+Av=-0.78;
+printf("\nCircuit voltage gain(Av)=%.2f",Av);
+
+Ai=(75*3.9*30.07)/((82+3.9)*(30.7+359.3));
+Ai=0.27;
+printf("\nCircuit current gain(Ai)=%.2f",Ai);
+Ap=Av*Ai;
+printf("\nCircuit Power gain(Ap) =%.2f",(-Ap));