add1 – Addition (easy version) – Computer Science by Example

add1 – Addition (easy version)

Write a program that reads a pair of numbers and prints its sum.

If I have two oranges and three tomatoes, how many items to I have?

Your program should read from the standard input and print to the standard output. The standard input and output devices are usually the keyboard and screen of a command line session. Here are a few example sessions:

$ ./add1
3 7
10

$ ./add1
1234 4321
5555

Input and Output

The input contains a single line with two integers x and y where 0 ≤ x, y ≤ 100 000.

The output should contain a single integer z where z = x + y.

Example input 1

3 7

Example output 1

Example input 2

1234 4321

Example output 2

The `add` function

For a full score, in addition to producing the correct output, the program should be implemented using an add function that receives two integers as arguments and returns an integer. Please refer to the information for the chosen language:

C prototype: int add(int x, int y);
Python definition: def add(x,y):
Haskell type: add :: Int -> Int -> Int
C++ prototype: int add(int x, int y);
C# definition: public static int Add(int x, int y) inside a class Program
Java definition: public static int add(int x, int y) inside a public class Add
JavaScript definition: function add(x, y)
Lua definition: function add(x, y)
Ruby definition: def add(x,y)
Racket definition: (define (add x y) ...)
Scheme definition: (define (add x y) ...)

The add function should not print anything. It should just perform the computation and return an integer. The function and input/output processing must exist in the same program. Create a single submission with the function and main program. If you are confused by the above, try earning a partial score first.

Specifically for this exercise when using Python, JavaScript, Lua or Ruby, avoid using sys.exit(), process.exit(), os.exit() or exit, as your program is appended with some extra assertions in one of the test sets.

Scoring

Submit your solution to be graded according to the following list:

2/12: produces the correct sum for the above examples in an incorrect format
4/12: produces the correct sum for the above examples in the correct format
8/12: produces the correct sum for other examples
12/12: implements the add function

Hints

Automated judge: Keep in mind that when your program is submitted it will not be run by a human but instead by an automated judge. Instructions should be followed exactly or the judge will not give you a full score.

Your program should not print messages like Please type two numbers: or The sum is 10. Instead, just print the resulting number followed by a line break as in the example output.
Exit immediately: Your program should print the addition result then exit immediately. Do not use system("pause"), sleep(1) or anything of sorts.
Redirecting input: On most systems (Windows / Linux / OS X), it is possible to redirect the standard input and output of your program to files, like so:
```
$ ./add1 <inputfile.txt >outputfile.txt
```
If you create a plain text file with the “example input”, the above command should produce a plain text file with the “example output”.
Windows users: On Windows, you should not use ./ to run a program in the current directory, do instead:
```
 C:\> add1.exe
 12 21
 33
```
There is no need to check boundaries: It is out of scope of this exercise to check boundaries. The boundaries for x and y are given for information only: 0 ≤ x, y ≤ 100 000. This just means that to get a full score, it is enough to write a program that works under these conditions, e.g.: two “C-int” fields will be enough to hold the values. There’s no need to check that x and y are in this interval.
Easier exercises: If you have difficulty with this exercise, try the hello exercise first.

try first: triple1 inc1

try next: mult1

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