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+//chapter11
+//example11.3
+//page205
+
+alpha=0.9
+Ie=1 //mA
+
+// since alpha=Ic/Ie we get
+
+Ic=alpha*Ie
+
+// since Ie=Ic+Ib we get
+
+Ib=Ie-Ic
+
+printf("base current = %.3f mA \n",Ib)