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+//Example 4.5 // Determine the differece voltage and open loop gain of an op-amp
+clc ;
+clear ;
+close ;
+V1 = 5 ; // volt // input voltage  // GND
+V2 = -5 ; // volt  
+Vo = -20 ; //volt  // output voltage
+
+// the difference voltage is given by 
+ Vd = V2-V1 ;
+disp('  The difference voltage is = '+string(Vd)+' V ');
+
+// open loop gain 
+A = (Vo/Vd);
+disp('  The open loop gain is = '+string(A)+'  ');
+
+