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+//Chapter 4, Example 4.11, page 164
+clc
+//Initialisation
+R12=150                                          //12 month average value
+fs0=4.416
+fs100=5.473
+n=0.23
+pi=3.14
+x=45*pi/180                                 //zenith angle in radians                    
+
+//Calculation
+f1=63.7+0.728*R12+0.00089*R12**2
+fs=fs0+0.01*(fs100-fs0)*R12
+F1=fs*(cos(x))**n                            //critical frequency
+
+//Results
+printf("(1) R12 = %d",R12)
+printf("\n(2) F12 = %d",f1)
+printf("\n(3) f0F1 = %.2f MHz",F1)