repeat1 – Repeat-a-number – Computer Science by Example

repeat1 – Repeat-a-number

Write a program that reads a single number from standard input and repeats it on standard output. The standard input and output are usually the keyboard and screen of a command line session. Here is an example command line session with such a program:

$ ./repeat1
1
1

$ ./repeat1
2
2

If you read 1, write 1; If you read 2, write 2; If you read 3, write 3; etc.

A parrot repeating numbers: 1, 1, 2, 2, 43, 43

Input and Output

Input will contain a single line with a single integer number x. Output should contain a single line with the same number x. This output line should be terminated by a line break.

Example input 1

Example output 1

Example input 2

Example output 2

Scoring

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

1/10: works for the above examples but produces output in an incorrect format
2/10: works for the above examples and produces output in the correct format
10/10: works for other examples

Hints

If you do not know where to start, read the Computer Science by Example book. First, setup your environment then learn the programming basics. Here are some 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 a number: or The typed number is 23. Instead, just print the resulting number followed by a line break as in the example output.
Exit immediately: Your program should print the given number 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:
```
 $ ./repeat1 <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”.

This is actually how the automated judge runs your program.
Windows users: On Windows, you should not use ./ to run a program in the current directory, do instead:
```
 C:\> repeat1.exe
 23
 23
```
Easier exercises: If you have difficulty with this exercise, try the hello exercise first.

try first: hello

try also: hi1

try next: age1

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