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+//chapter16
+//example16.3
+//page346
+
+Av1=100
+Avf1=50
+Avf2=75
+
+// since Avf=Av/(1+Av*mv), we get
+mv=(Av1/Avf1-1)/Av1
+Av2=Avf2/(1-mv*Avf2)
+
+printf("fraction of output fed back to input = %.3f \n",mv)
+printf("for overall gain = 75 and same fraction, required gain = %.3f \n",Av2)