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+//chapter22
+//example22.2
+//page491
+
+I_DSS=32 // mA
+V_GS=-4.5 // V
+V_GS_off=-8 // V
+
+I_D=I_DSS*(1-V_GS/V_GS_off)^2
+
+printf("drain current = %.3f mA \n",I_D)