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+//CHAPTER 1- D.C. CIRCUIT ANALYSIS AND NETWORK THEOREMS 
+//Example 57
+
+disp("CHAPTER 1");
+disp("EXAMPLE 57");
+
+//VARIABLE INITIALIZATION
+v=10;                          //voltage source in Ohms
+r1=2;                          //RHS resistance in Ohms
+r2=2;                          //in Ohms
+r3=4;                          //in Ohms
+r4=4;                          //in Ohms
+I=20;                          //current source in Amperes
+
+//SOLUTION
+
+r=r1+r2;
+//deactivating voltage source of 10Ω
+v1=-I/((1/r)+(1/r3)+(1/r4));   //from equation
+I1=v1/r3;
+
+//deactivating current source of 20A
+v2=(v/r)/((1/r)+(1/r3)+(1/r4)); 
+I2=v2/r3;
+
+I_tot=I1+I2;
+if(I_tot>0)
+disp(sprintf("The value of I is %f A (upward)",I_tot));
+else
+disp(sprintf("The value of I is %f A (downward)",-I_tot));
+
+//END
+