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+//CHAPTER 1- D.C. CIRCUIT ANALYSIS AND NETWORK THEOREMS 
+//Example 49
+
+disp("CHAPTER 1");
+disp("EXAMPLE 49");
+
+//VARIABLE INITIALIZATION
+v1=110;                        //voltage source in Volts
+v2=80;                         //voltage source in Volts
+v3=50;                         //voltage source in Volts
+r=2;                           //in Ohms
+
+//SOLUTION
+
+//solution (a)
+I1=4;                          //charging
+I2=6;                          //charging
+r1=((v1-v2)-((I1+I2)*r))/I1;
+r2=((v1-v3)-((I1+I2)*r))/I2;
+disp(sprintf("(a) R1= %f Ω",r1));
+disp(sprintf("    R2= %f Ω",r2));
+
+//solution (b)
+I1=2;                           //discharging
+I2=20;                          //charging
+r1=((v1-v2)-((I2-I1)*r))/(-I1);
+r2=((v1-v3)-((I2-I1)*r))/I2;
+disp(sprintf("(b) R1= %f Ω",r1));
+disp(sprintf("    R2= %f Ω",r2));
+
+//solution (c)
+I1=0;
+I2=(v1-v2)/r;
+r2=((v1-v3)-(I2*r))/I2;
+disp(sprintf("(c) I1=0 when R2= %d Ω",r2));
+
+//END
+