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+//chapter 5
+//example 5.3
+//page 151
+clear all;
+clc ;
+//given
+R1=39;//kohm
+hie=1.2;//input resistance in kohm
+Rc=1.8;//collector resistor kohm
+R2=47;//kohm
+hoe=1.5;//microS
+Rl=68;//load resistor kohm
+hfe=80;
+//Circuit input impedance
+Zi=(R1*hie)/(R1+hie);
+printf("\nCircuit input impedance=%.2f kohm",Zi);
+
+//Circuit output impedance
+Zo=1/((hoe/1000)+(1/Rc)+(1/R2));
+printf("\nCircuit output impedance=%.2f kohm",Zo);
+
+//voltage gain
+Av=round((hfe*(1/(1/R2+1/Rc+1/Rl)))/hie);
+printf("\nvoltage gain=%d",Av);
+