Homework 3:

Short Description:

This assignment is worth 10 points.

Goals

• Have written a program that parses command line arguments.

Formal Description

By default counter should print the numbers 1 through 10 on a line separated by spaces. There should be no space after the final number.

The program should respond to the following command line arguments.

• -h, --help: print a help message describing command line arguments.
• -b n, -bn, --bottom=n: set the low value to be the integer n.
• -t n, -tn, --top=n: set the high value to be the integer n.
• -l m,n -lm,n --limit=m,n: set the low value to be m and the high value to be n.
• -r, --reverse: print from high to low, not low to high
• -s n -sn, --step=n: increment (or decrement) by n, the default is 1. The step value is restricted to positive integers (no negatives or 0).
• -v, --verbose: parse command line arguments and print a summary of the values. (See below)

You should parse all command line arguments before taking any actions. Values can be replaced by subsequent arguments. For example

counter -l 1 -l2 --low=4 

4 5 6 7 8 9 10

You should never print a value lower than the low value or higher than the high value.

You should always print the starting value (low for normal and high for reverse mode).

If settings conflict after all arguments are parsed, you should print a message explaining the error and exit. For example if the low value is greater than the high value, an error should be printed and no output produced. Please print all errors to cerr, not cout.

For verbose mode:

• Print a summary of control values and exit.
• Do this only after checking for errors
• Use the following format:

  Low = n
  High = n
  Step = n
  Reverse = Yes|No 
  Help = Yes|No
  Verbose = Yes
  
      

Submission