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+//Example 4.17: 
+clc;
+clear;
+close;
+//given data :
+format('v',5)
+A=200;//gain without feedback
+Beta=0.05;//feed back ratio
+Af=(A/(1+(Beta*A)));//gain with feedback
+disp(Af," gain with negative feedback is ,=")
+Dn=10;//percentage distortion
+format('v',6)
+Dn1=(Dn/(1+A*Beta));//percentage Distortion with negative feedback
+ff=Beta*A;//feedback factor
+vo=0.5;//initial output voltage
+vi=A*vo;//in V
+vin=vi/Af;//in V
+disp(Dn1,"percentage Distortion with negative feedback is ,(%)=")
+disp(vin,"new input voltage is ,(V)=")
+//gain and input voltage are calculated wrong in the textbook