Exercise 2

Question

Write a function called fileLen that has an input parameter of type string and returns an int and an error. The function takes in a file name and returns the number of bytes in the file. If there is an error reading the file, return the error. Use defer to make sure the file is closed properly.

Solution

The fileLen function should look a lot like the sample code for the simple_cat program. Rather than being in the body of main, it is a separate function. Use the count returned from calls to Read and add them up. It is important to get the count before checking if Read returned an error, since it returns an (ignorable) io.EOF error when it reaches the end of a file.