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+// Theory and Problems of Thermodynamics
+// Chapter 2
+// First Law of Thermodynamics
+// Example 1
+
+clear ;clc;
+
+//Given data
+// a system is taken from state 1 to state 2 along a path A
+Q_A_21  = 200   //heat energy received in kJ
+W_A_21  = 100   //work done  in kJ
+// if the system is taken different path from state 2 to state 1 
+W_A_12  = -150   //spend work on system 
+// Path C
+Q_C_12 = 0;                     // for adiabatic Q = 0
+
+
+//Path A
+U_A_21 = Q_A_21 - W_A_21;     // U_A_21 = U2 - U1 = Q - W
+
+// determine heat interaction along path B
+U_B_12 = - U_A_21;               // U_B_12 = U1 - U2 = -(U2 - U1)
+Q_A_12 = U_B_12 + W_A_12        // U1 - U2 = Q - W
+
+// determine work done on system in surroundings in adiabatic path C
+U_C_12 = U_B_12;            
+W_C_12 = Q_C_12 - U_C_12;       // work done
+
+// Results
+mprintf('Heat interaction along path B = %3.0f kJ', Q_A_12)
+mprintf('\n The work done on surroundings in adiabatic path B = %3.0f kJ', W_C_12)