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+// Example 7.2, page no-262
+clear
+clc
+
+c=3*10^8         //speed of light 
+R=10000          //path length
+f=4              // operating frequencyin GHz
+EIRP=50          //in dB
+gr=20            //antenna gain in dB
+rp=-120          // received power in dB
+//(a)
+lamda=c/(f*10^9)
+pl=20*log10(4*%pi*R/lamda)
+
+//(b)
+Lp=EIRP+gr-rp
+printf("(a)\n Operating wavelength = %.3f m\n Path loss(in dB) = %.2f dB",lamda,pl)
+printf("\n\n (b)\n Path loss = %.0fdB",Lp)