CS157 HW1: Command-Line Arguments and Scientific Data Types

Description

For this assignment you will write a program called dogs.c that uses command line arguments to get the names of file to process, read data from those files, and perform some trivial calculations.

Your program must run with one or more command-line arguments: the names of the files to process. Your program must ensure that at least one command-line argument is submitted to the program. If not, you must print an appropriate usage statement.

Data File

The data files you must process should contain several fields in each line: a dog breed name, a range of weights, and “lb”, which means pounds. For example:

    Akita 75-120 lb
    Beagle 20.0-25.765 lb
    Bouvier 60-90 lb
    Bulldog 49-55 lb
    Cerberus 1000-2000 lb

Here’s another, less orderly but still valid, example:

    Bullmastiff 100-133 lb
        Chihuahua 2-6 lb
    Collie 0000050.246813579-75 lb
      corgi            24-30                   lb
    woof 17.4128767-18.4128767 lb
    Wh!pP3+ 25-45 lb

Your program must work on these files or other such files, no matter what their filenames are. It should print the breed name, range of weights in pounds, and the range of weights in kilograms. For the purpose of this assignment, there are 0.453 592 37 kg in a pound.

Sample Run

% cat dog-weights
Dalmatian 55-55 lb
Doberman 66-88 lb
Maltese 6.5-9 lb
Papillon 7-10 lb
Beagle
Pekingese 8-10 lb
Beagle fish
Beagle 10
Beagle 10-
Beagle 10-fish
Beagle 10-99
Beagle 10-99 fish
Whippet 25-45 lb
% c11 -Wall dogs.c
% ./a.out dog-weights
Dog Breed               min(lb)    max(lb)    min(kg)    max(kg)
---------               -------    -------    -------    -------
Dalmatian                 55.00      55.00      24.95      24.95
Doberman                  66.00      88.00      29.94      39.92
Maltese                    6.50       9.00       2.95       4.08
Papillon                   7.00      10.00       3.18       4.54
./a.out: Bad line 5 in dog-weights
Pekingese                  8.00      10.00       3.63       4.54
./a.out: Bad line 7 in dog-weights
./a.out: Bad line 8 in dog-weights
./a.out: Bad line 9 in dog-weights
./a.out: Bad line 10 in dog-weights
./a.out: Bad line 11 in dog-weights
./a.out: Bad line 12 in dog-weights
Whippet                   25.00      45.00      11.34      20.41

Debugging

If you encounter “STACK FRAME LINK OVERFLOW”, then try this:

    export STACK_FRAME_LINK_OVERRIDE=ffff-ad921d60486366258809553a3db49a4a

Requirements

Do not research a more complete list of dog breeds or weight ranges. Trust the data file given.
Only display one header, no matter how many files are given.
If several files are given, show their output, one after another.
Produce an error message if:
- you can’t open a given file. Then, stop the program.
- a line doesn’t contain the right data
- a weight range is out of order (e.g., 7-5 lb)
All error messages must go to standard error. They must include the name of the program, however we may have compiled it. Don't make the mistake of hard-coding in a.out into your message.
It is guaranteed that the breed names will not contain spaces, but they may contain non-alphabetic characters.
The filename will be no more than eighty characters long.
No data file line will be more than eighty characters long.
No weight will be more than 9999 lb.
Your output must be just like the sample:
- It must have exactly as many spaces as the sample, given that data.
- It must line up.
- The numbers displayed must be in fixed-point format, with two digits after the decimal point.
You may not use global variables. Global constants are ok.
Comment block at the very very very beginning of the file with name/date/purpose of program.
Comment block at the start of each function, describing what it does.
You must close any file that you open.
Use char constants for char values, not int ASCII values: 'A', not 65.

How to submit your homework:

    ~cs157/bin/checkin HW1 dogs.c

How to receive negative points:

Turn in someone else’s work.

CS157: Intro to C, Part II

Spring 2018