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+//chapter27
+//example27.5
+//page582
+
+hie=1700 // ohm
+hre=1.3d-4 
+hoe=6d-6 // mho
+hfe=38
+rL=2000 // ohm
+
+Zin=hie-hre*hfe/(hoe+1/rL)
+
+Ai=hfe/(1+hoe*rL)
+
+Av=-hfe/(Zin*(hoe+1/rL))
+
+printf("input impedence = %.3f ohm \n",Zin)
+printf("current gain = %.3f \n",Ai)
+printf("voltage gain = %.3f \n",-Av) // considering magnitude of Av,we neglect its negative sign and so we display -Av instead of Av