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+//Example5.1 // find the total offset voltage of feedback op-amp
+clc;
+clear; 
+close;
+Vos = 4 ; //mV  // input offset volt
+Ios = 150*10^-3 ; // input offset current
+R1 = 5 ; //kilo ohm  // input resistance
+R2 = 500 ; //kilo ohm  // feedback resistance
+
+// the output voltage (Vo) of an op-amp circuit due to input offset voltage (Vos) is
+Vo1 = ((R1+R2)/(R1)*Vos) ;
+disp(' the output voltage (Vo) of an op-amp circuit due to input offset voltage (Vos) is = '+string(Vo1)+' mV ');
+
+// the output voltage (Vo) of an op-amp circuit due to input offset current (Ios) is
+Vo2 = R2*Ios ;
+disp(' the output voltage (Vo) of an op-amp circuit due to input offset current (Ios) is = '+string(Vo2)+' mV ');
+
+// the total offset voltage is
+Vo = Vo1+Vo2 ;
+disp(' the total offset voltage (Vo) of an op-amp circuit is = '+string(Vo)+' mV ');