//Variable declaration:
//From example 17.4:
X = 0.1246                      //X-coordinate of figure 17.3

//Calculation:
//Applying equation (A) from Table 17.3:
Y = 4.5128*X**3 - 10.079*X**2 - 31.413*X + 101.47

//Result:
printf("The fin efficiency is : %.1f %%",Y)