combin: Binary Combiner

combin is a Java utility to generate all possible binary combinations of a given size n. It offers flexible output options: print results to the console, save them to a file, or store them in memory.

Features

• Generate binary combinations: For any size n (up to (2^{16})).
• Customizable characters: Replace 0 and 1 with any other characters.
• Output options:
  • Print to the console.
  • Save to a file.
  • Store in an ArrayList.

---

Requirements

• Java 8 or higher.

---

How to Use

Compile the Code

javac Combin.java

Run the Program

java Combin <size> [bin0] [bin1] [filename] [console]

Parameters

1. <size>: (Required) The size of the binary combinations. Must be a positive integer ≤ 16.
2. [bin0]: (Optional) Character to use instead of 0.
3. [bin1]: (Optional) Character to use instead of 1.
4. [filename]: (Optional) File to save the combinations. If provided, the program writes the combinations to this file.
5. [console]: (Optional) If provided and set to console, results are printed to the console.

---

Examples

Default Binary Output

Generate all binary combinations of size 3 and print them to the console:

java Combin 3 1 0

Custom Characters

Generate combinations of size 3 using X and Y instead of 0 and 1:

java Combin 3 X Y console

Save to a File

Generate combinations of size 4 and save them to output.txt:

java Combin 4 0 1 output.txt

Save and Print

Generate combinations of size 4, save them to output.txt, and also print them:

java Combin 4 0 1 output.txt console

---

Error Handling

• Invalid size: If <size> is not provided, not a number, or exceeds the limit, an error is displayed.
• Invalid characters: Binary characters must be single characters.
• File write issues: Errors during file operations are logged to the console.

---

Example Output

Command:

java Combin 2 1 0 console

Output:

Generating binary combinations for size: 2
Generated combinations:
00
01
10
11

---

License

This project is licensed under the MIT License. See the LICENSE file for details.