... the error in the program in Exercise 3, and recompile, link, and run it. What does it do? Teach Yourself C++ in 21 Days, Second Edition IntroductionWeek 1 at a Glance:Day 1 Getting StartedDay ... there is no prototype for main, add the line int main(); just before line 3. You will need to add this line before the beginning of the main function in every program in this book. Most compilers ... WARNING: The following listing contains line numbers on the left. These numbers are for reference within the book. They should not be typed in to your editor. For example, in line 1 of Listing...