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+//chapter21
+//example21.1
+//page456
+
+Vcc=10 // V
+Vbe=0.7 // V
+Rb=47d3 // ohm
+Rc=1d3 // ohm
+gain=100
+
+Ic_sat=Vcc/Rc
+Ib=Ic_sat/gain
+V_plus=Ib*Rb+Vbe
+
+printf("voltage required to saturate transistor = +%.3f V \n",V_plus)