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+// Exa 3.21
+format('v',7);
+clc;
+clear;
+close;
+// Given data 
+// Part (a)
+V_C= 2;// in V
+R_C= 1;// in kΩ
+R_C=R_C*10^3;// in Ω
+V_B= 4.3;// in V
+R_B= 200;// in kΩ
+R_B=R_B*10^3;// in Ω
+I_C= V_C/R_C;// in A
+I_B= V_B/R_B;// in A
+Beta= I_C/I_B;
+disp("Part (a)")
+disp(I_C*10^3,"Collector current in mA is : ")
+disp(I_B*10^6,"Base current in µA is : ")
+disp(Beta,"The value of Beta is : ")
+
+// Part (b)
+V_C= 2.3;// in V
+R_C= 230;// in kΩ
+R_C=R_C*10^3;// in Ω
+V_B= 4.3;// in V
+R_B= 20;// in kΩ
+R_B=R_B*10^3;// in Ω
+I= V_C/R_C;// current through 230Ω resistro i.e. I_C + I_B in A
+I_B= (V_B-V_C)/R_B;// in A
+I_C= I-I_B;// in A
+Beta= abs(I_C/I_B);
+disp("Part (b)")
+disp(I_C*10^3,"Collector current in mA is : ")
+disp(I_B*10^3,"Base current in mA is : ")
+disp(Beta,"The value of Beta is : ")
+
+// Part (c)
+V_E= 10;// in V
+R_E= 1;// in kΩ
+R_E=R_E*10^3;// in Ω
+V_1= 7;// in V
+R_C= 1;// in kΩ
+R_C=R_C*10^3;// in Ω
+V_B= 6.3;// in V
+R_B= 100;// in kΩ
+R_B=R_B*10^3;// in Ω
+I_E= (V_E-V_1)/R_C;//in A
+I_C=I_E;// in A (approx)
+V_C= I_C*R_C;// in V
+I_B= (V_B-V_C)/R_B;// in A
+Beta= I_E/I_B-1;
+disp("Part (c)")
+disp(I_E*10^3,"Emitter current in mA is : ")
+disp(I_B*10^6,"Base current in µA is : ")
+disp(V_C,"Collector voltage in volts is : ")
+disp(Beta,"The value of Beta is : ")
+
+// Note : In the book the value of base current in the first part is wrong due to calculation error.
+//           In the part (b) the values of collector current and Beta are wrong due to calculation error in the first line of part (b)