Challenge 00: I/O

After a summer of slinging some C# code in a Microsoft shop, Vector Bill is ready to level up and get a better, err more interesting, job. To prepare for his fall job hunting campaign, he is doing some coding exercises on HackerRank and LeetCode in hopes of acing the impending technical programming interviews.

Unfortunately, while he has a pretty good handle on data structures (ie. just use a vector for all the things), he is struggling with reading input from standard input.

For this challenge, help Vector Bill out by writing a program that reads input in the following format:

1. First you will get a format specifier in the form: N, L, or S.

2. Next, you will get a stream of integers.

   • If the format is N, you will get an integer n which specifies the number of integers followed by the n integers.

   • If the format is L, you will get a single line with all the integers.

   • If the format is S, you will get an integer s which specifies the sentinel to read until. That is you should read all the integers until you reach this sentinel.

   All integers will be separated by whitespace.

3. Once you read in the integers, you should compute the sum of all the integers and then display the total.

An example of the expected input and output is described below.

Input

Input will be provided via standard input in the form described above. Here is an example input:

N
5
1
2
3
4
5
N
5
1 2 3 4 5
L
1 2 3 4 5
S
-1
1 2 3 4 5 -1

You are to process each format block until you reach the end of the input stream.

Output

Output must be printed to standard output in the following format:

The sum of $INTEGERS is $RESULT

Where $INTEGERS is the list of integers provided in the input and $RESULT is the sum of all those integers.

Here is the output given the example input above:

The sum of 1 2 3 4 5 is 15
The sum of 1 2 3 4 5 is 15
The sum of 1 2 3 4 5 is 15
The sum of 1 2 3 4 5 is 15

If you are given an invalid format, you should display the following message:

Unknown format: $FORMAT

Where $FORMAT is the invalid format read from the input stream.

If the list of integers is empty, then you should not display anything.

Submission

To submit your work, follow the same procedure you used for Reading 00:

$ cd path/to/cse-30872-fa17-assignments     # Go to assignments repository
$ git checkout master                       # Make sure we are on master
$ git pull --rebase                         # Pull any changes from GitLab

$ git checkout -b challenge00               # Create and checkout challenge00 branch

$ $EDITOR challenge00/program.cpp           # Edit your code

$ git add challenge00/program.cpp           # Stage your changes
$ git commit -m "challenge00: done"         # Commit your changes

$ git push -u origin challenge00            # Send changes to GitLab

To check your code, you can use the .scripts/submit.py script or curl:

$ .scripts/submit.py
Submitting challenge00 assignment ...
Submitting challenge00 code ...
  Result Success
   Score 6.00

$ curl -F source=@challenge00/program.cpp  https://dredd.h4x0r.space/code/cse-30872-fa17/challenge00
{"score": 6, "result": "Success"}

$ ./program < input.txt | diff -u - output.txt

Once you have commited your work and pushed it to GitLab, member to create a merge request. Refer to the Reading 00 TA List to determine your corresponding TA for the merge request.