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+//chapter20
+//example20.7
+//page442
+
+Vz=10 // V
+Vbe=0.5 // V
+Rl=1000 // ohm
+
+Vout=Vz-Vbe
+Il=Vout/Rl
+
+printf("load voltage = %.3f V \n",Vout)
+printf("load current = %.3f mA \n",Il*1000)