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+//chapter9
+//example9.11
+//page152
+
+rf=20 // ohm
+Rl=800 // ohm
+Vm=50 // V
+
+Im=Vm/(rf+Rl) // in ampere
+Idc=Im/%pi // in ampere
+Irms=Im/2 // in ampere
+Pac=Irms^2*(rf+Rl)
+Pdc=Idc^2*Rl
+Vout=Idc*Rl
+efficiency=100*Pdc/Pac
+
+printf("Im = %.1f mA \n",Im*1000)
+printf("Idc = %.1f mA \n",Idc*1000)
+printf("Irms = %.1f mA \n \n",Irms*1000)
+printf("ac power input = %.3f W \n",Pac)
+printf("dc power output = %.3f W \n \n",Pdc)
+printf("dc output voltage = %.3f V \n \n",Vout)
+printf("efficiency = %.3f percent \n",efficiency)