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+//chapter21
+//example21.5
+//page472
+
+Vin_peak=12 // V
+
+// for positive half cycle diode conducts so
+Vout_peak=Vin_peak-0.7 // V
+
+// for negative half cycle diode does not conduct so
+Vout_min=0 // V
+
+printf("peak output voltage = %.3f V in positive half cycle and \n                       %.3f V in negative half cycle",Vout_peak,Vout_min)
+
+// plotting input and output waveforms in same graph using following code instead of using xcos
+clf()
+t=linspace(0,2*%pi,100)
+Vin=12*sin(t)
+Vout=Vout_peak*sin(t)+Vout_min
+plot2d(t,Vin,style=2,rect=[0,0,10,20])
+xtitle("input - blue     output - green","t","volts")
+plot2d(t,Vout,style=3,rect=[0,0,10,20])