Learning Goals
==============
This assignment asks you to write a program that reads numbers from a file,
adds the numbers, and saves the sum into a file.
You will learn to
* Read integers from file, add them, write the result to file
* Use pointer to pass information to caller
Read Data from File and Write Data to File
==========================================
The previous assignment uses `fgetc` to read one character at a time.
This assignment asks you to use `fscanf` to read numbers. To write a
number, you can use `fprintf`.
What You Need To Do
===================
You need to write a function called `addFile(char * filename, int *
sum)` that opens a file named filename. If it fails, return false, and
**DO NOT** `fclose()`. You have to read the integers in the file, and
store the sum. Further instructions are in the comments in the
function in file `fileint.c`.
You also need to write a function called `writeSum(char * filename,
int sum)` that writes the sum as an integer which name is
`filename`. Further instructions are in the comments in the function
in file `fileint.c`
WHAT TO SUBMIT
==============
You **must** follow the instructions precisely. Failing to follow
these instructions will likely make you receive zero in this
assignment. Your score **is determined by your submission**, nothing
else. The teaching staff is strictly prohibited seeing anything on
your computer for grading.
```
zip hw05.zip fileint.c
```
Enter Brightspace, upload `hw05.zip`.
