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+//chapter9
+//example9.25
+//page173
+
+Ei=45 // V
+Vz1=15 // V
+Vz2=15 // V
+Iz=200d-3 // current rating for each zener in ampere
+
+Eo=Vz1+Vz2
+
+R=(Ei-Eo)/Iz
+
+printf("regulated output voltage = %.3f V \n",Eo)
+printf("required series resistance = %.3f ohm \n",R)