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+//chapter9
+//example9.18
+//page162
+
+Vrms_A=0.5 // V
+Vdc_A=10 // V
+Vrms_B=1 // V
+Vdc_B=25 // V
+
+ripple_A=Vrms_A/Vdc_A
+ripple_B=Vrms_B/Vdc_B
+
+if ripple_A>ripple_B
+ printf("power supply B is better \n")
+elseif ripple_B>ripple_A
+ printf("power supply A is better \n")
+else
+ printf("both are equal \n")
+end