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+//CHAPTER 1- D.C. CIRCUIT ANALYSIS AND NETWORK THEOREMS 
+//Example 20
+
+disp("CHAPTER 1");
+disp("EXAMPLE 20");
+
+//VARIABLE INITIALIZATION
+I=20;                             //current source in Amperes
+v1=10;                            //voltage source in Volts
+v2=40;                            //voltage source in Volts
+r1=8;                             //in Ohms
+r2=5;                             //in Ohms
+r3=4;                             //in Ohms
+r4=12;                            //in Ohms
+
+//SOLUTION
+req=r1+r2;
+rn=(req*r3)/(req+r3);
+//finding In by mesh analysis
+//(17)I2+(-4)I3=110.......eq (1)
+//(1)I2+(-1)I3=-10........eq (2)
+//solving the equations by matrix mehod
+A=[17 -4;1 -1];
+b=[110;-10];
+x=inv(A)*b;
+I2=x(1,:);                         //to access the 1st element of 2X1 matrix
+I3=x(2,:);                         //to access the 2nd element of 2X1 matrix
+In=I3;
+I=(rn*In)/(rn+r4);
+disp(sprintf("By Norton Theorem, the value of I is %f A",I));
+
+//END