Functions :: Functions as Parameters

Functions :: Functions as Parameters

• This is a little more advanced section on functions, but is very useful. Take this for example:

    int applyeqn(int F(int), int max, int min) {
     int itmp;
    
     itmp = F(int) + min;
     itmp = itmp - max;
     return itmp;
   }
  

  What does this function do if we call it with applyeqn(square(x), y, z);? What happens is that the int F(int) is a reference to the function that is passed in as a parameter. Thus inside applyeqn where there is a call to F, it actually is a call to square! This is very useful if we have one set function, but wish to vary the input according to a particular function. So if we had a different function called cube we could change how we call applyeqn by calling the function by applyeqn(cube(x), y, z);.