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+//chapter20
+//example20.12
+//page446
+
+Vz=8.3 // V
+Vbe=0.7 // V
+Rl=100 // ohm
+Rs=130 // ohm
+Vin=22 // V
+
+Vout=Vz+Vbe
+Il=Vout/Rl
+Is=(Vin-Vout)/Rs
+Ic=Is-Il
+
+printf("regulated output voltage = %.3f V \n",Vout)
+printf("load current = %.3f mA \n",Il*1000)
+printf("current through Rs = %.3f mA \n",Is*1000)
+printf("collector current = %.3f mA \n",Ic*1000)