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+//chapter 2
+//may june 2008
+printf("\n");
+Pt=15
+Aet=2.5;
+Aer=0.5;
+d=15*10^3;
+f=5*10^9;
+c=3*10^8;
+lamda=c/f;
+Pr=(Pt*Aet*Aer)/((d)^2*(lamda)^2);
+printf("the radiated power is %gW",Pr);