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+//chapter27
+//example27.6
+//page582
+
+hie=1500 // ohm
+hre=4d-4 
+hoe=5d-5 // mho
+hfe=50
+Rc=10d3 // ohm
+R_L=30d3 // ohm
+R1=80d3 // ohm
+R2=40d3 // ohm
+
+rL=Rc*R_L/(Rc+R_L)
+Zin=hie-hre*hfe/(hoe+1/rL)
+Zin_stage=Zin*(R1*R2/(R1+R2))/(Zin+(R1*R2/(R1+R2)))
+
+Av=-hfe/(Zin*(hoe+1/rL))
+
+printf("input impedence = %.3f ohm \n",Zin_stage)
+printf("voltage gain = %.3f \n",Av)
+
+// the accurate answers are input impedence = 1321.957 ohm and voltage gain = -196.078 but in book they are given as 1320 ohm and -196 respectively