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+// Exa 3.4
+clc;
+clear;
+close;
+// Given data
+Vd_1= 0.3;// in V
+V_T= 25;// in mV
+V_T= V_T*10^-3;// in V
+// when Id_1= 1 mA
+Id_1= 1;// in mA
+Id_1=Id_1*10^-3;// in A
+// Formula Id_1= Io*[%e^(Vd/(n*V_T))-1]= Io*[e^(Vd/(n*V_T))]
+// Id_1= Io*[e^(Vd_1/(n*V_T))]            (i)
+
+// when Id_2= 200 mA
+Id_2= 200;// in mA
+Id_2=Id_2*10^-3;// in A
+Vd_2= 0.45;// in V
+// Id_2= Io*[e^(Vd_2/(n*V_T))]            (ii)
+// Dividing (ii) by (i), we have
+n= (Vd_2-Vd_1)/(log(Id_2/Id_1)*V_T);
+disp(n,"The value of the constant for the diode is ")