From talking with students I see that many have left out one lab or another due to time constraints. If you haven't done all the labs so far, I recommend spending some time this week on the earlier labs. All of them cover things you will want to know to be able to call yourself a C programmer.
Here are some function pointer exercises.
1. Write a function called "call" which takes two parameters, one a pointer to function with one int parameter and returning int, and the other an int. It calls the function and returns its value. This is a sufficiently trivial example to be quite silly, but it is probably a good first exercise.
So for example,
int xplusthree(int x)
{
return x + 3;
}
int main()
{
printf("%d\n", call(xplusthree, 58));
return 0;
}
should print 61.
2. Write a function which sums the values of a function in a certain range. That is, you pass in a function pointer, and a "low" and a "high" value, and it calls the function high-low+1 times (low to high inclusive) and adds up the return values.
3. If you have time and have done the other labs to date, write a function which implements one of the root-finding algorithms to find a zero of an arbitrary function which is passed in. The function which is passed in will accept a double parameter and return a double value. The bisection method or secant method are reasonable algorithms to implement in this way with function pointers; for Newton's method, you'd need a second parameter which is a function which returns the derivative (at a given point; again, a double parameter and a double return value).