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+//chapter9
+//example9.22
+//page172
+
+Ei=12 // V
+Vz=7.2 // V
+Eo=Vz
+Iz_min=10d-3 // A
+Il_max=100d-3 // A
+
+// we see that R=(Ei-Eo)/(Iz-Il) and minimum Iz occurs when Il is maximum so
+R=(Ei-Eo)/(Iz_min+Il_max)
+
+printf("required series resistance = %.3f ohm \n",R)
+
+// on inserting this series resistance the output voltage will remain constant at 7.2 V
+
+// the accurate answer is 43.636 ohm but in book it is given as 43.5 ohm