The purpose of Homework 1 is brushing up C++ skills and warming up for future programming assignments. Vectors are not allowed. Linkedlist in C++ library should not be used. The program has the following functionality:

1. Once it starts, it asks the user to type the input file name (a txt file). The print out information must be:

"Please input the filename:"

2. The program uses the file name to open the file. The file has a number of lines. Each line has two numbers separated by a comma. Therefore, there are actually two columns of numbers.

For example:

312312, 56877

2267, 3698

3, 3478

87907, 768

3. The program processes the input data to calculate the average value of all valid numbers in the first column and the largest value of all valid numbers in the second column. The print out should be:

The average value of all numbers in the first column: XXX.XXXX

The largest value of all numbers in the second column: XXXXX

The total number of rows in the file is: XXXX

The invalid numbers are: XXX, XXX, XXX, ...

Requirements:

1. [will be 0 if it does not compile or crash when it starts]

The homework must be done in C++.

Your code must work under Code::Blocks and GCC (or g++) compiler.

2. [5%] The output average value should retain 4 decimal digits.

3. [10%] The program must use cin and cout to deal with command line input and output.

4. [10%] The program must ask user to input again without crashing if users input invalid file names.

5. [10%] The program must use arrays to solve the problem.

6. [30%] Students must implement loops by themselves to calculate the average and to find the largest value, invalid numbers, and number of rows.

7. [30%] There are invalid numbers (like 1P24 ...) in the input data file, make sure those numbers will be recognized and abandoned automatically by your program without crashing.