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+//chapter19
+//example19.13
+//page424
+
+Vt=110 // V
+Vc=100 // V
+
+// since Pt/Pc=1+m^2/2 and P is proportional to V^2 we get (Vt/Vc)^2=1+m^2/2
+// making m as subject we get
+
+m=(2*((Vt/Vc)^2-1))^0.5
+
+printf("modulation factor = %.3f or %.3f percent \n",m,m*100)