## Exercise 3

 1. Write the programs (or take them from your solutions from last
    week) from points 1-6 of ‹../02/3.txt› (i.e. exercise 3 from the
    last week)
 2. Write a simple makefile that tells ‹make› how to build
    ‹hello.o›, ‹main.o› and ‹bye.o›. We will not build a library at
    this time.
 3. Make it so that a binary called ‹hello› is built from these 3
    object files.
 4. Make sure that ‹greetings.h› appears in the prerequisites where
    it is required.
 5. Use ‹touch› on various source files and check that make does the
    right thing.

You can now continue to ‹4.txt›.
