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+// Exa 2.3
+
+clc;
+clear;
+
+// Given data
+
+// Single op-amp amplifier.
+ACL = 5; // Required gain(positive) 
+
+// Solution
+
+disp("Since the gain is positive, we have to make a non-inverting amplifier.");
+disp("Referring Fig. 2.7(a), select R1 = 10 kΩ.");
+R1 = 10*10^3; //Input resistance in Ω
+// Then from eqn. (2.20), we get, ACL = 1+ (Rf/R1);
+// Therefore
+Rf = (ACL-1)*R1;  //Feedback resistance in Ω   
+printf(' The calculated feedback resistance of amplifier i.e Rf = %d kΩ.\n',Rf/1000);