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+//Variable declaration:
+//From example 17.18:
+T = 250                         //Base temperature of fin ( F)
+h = 15                          //Convection coefficient of heat transfer (Btu/h.ft. F)
+w = 1                           //Base width of fin (ft)
+t = 1                           //Thickness of fin (in)
+H = 1/8                         //Height of fin (in)
+l = 1                           //Length of fin (in)
+Q = 357.2                       //Heat transfer rate (Btu/h.ft)
+
+//Calculation:
+A = (l*w+t*w+H*w)/12            //Heat transfer area of fin (ft^2)
+Qm = h*A*(T-70)                 //Maximum heat transfer rate (Btu/h.ft)
+n = Q/Qm*100                    //Fin efficiency
+
+//Result:
+printf("The fin efficiency is : %.1f %%",n)