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+//Chapter 3, Example 3.7, page 80
+clc
+
+//Initialisation
+f=18                                //frequency in GHz
+d=30                                //in km
+R=25                                //rainfall intensity in mm
+
+//Using Table 3.3
+av15=1.128
+av20=1.065
+av18=1.09
+kv15=0.0335
+kv20=0.0691
+kv18=0.0587
+
+//Calculation
+yr=kv18*R**av18                        //rain specific attenuation
+de=(90*(90+d)**-1)*d
+A=de*yr                                //Maximum rain attenuation
+ 
+//Results
+printf("(1) Rain specific attenuation = %.2f dB/km",yr)
+printf("\n(2) Maximum rain attenuation = %.1f dB",A)