How to use G++ on the command prompt?

 Here's a guide on how to use G++ on the command prompt:

1. Accessing the Command Prompt:

• Windows: Open the Start menu, search for "Command Prompt" or "CMD," and launch it.
• macOS/Linux: Open the Terminal app.

2. Navigating to the File Directory:

• Use the cd command to change directories:

  Bash

  cd path/to/your/file
  

  • Example: cd C:\Users\YourName\Desktop\C++Projects

3. Compiling a C++ File:

• Use the g++ command followed by the filename:

  Bash

  g++ filename.cpp
  

  • This creates an executable file named a.exe by default.

4. Specifying an Output Filename:

• Use the -o option to create an executable with a specific name:

  Bash

  g++ filename.cpp -o myprogram
  

5. Running the Executable:

• Type the name of the executable file and press Enter:

  Bash

  ./myprogram
  

Additional Options:

• -Wall: Enables all warnings to catch potential issues.
• -g: Includes debugging information for use with a debugger.
• -std=c++11 (or other C++ standard): Specifies the C++ standard to use.
• -I directory: Includes header files from a specified directory.
• -L directory: Links libraries from a specified directory.
• -l library: Links a specific library.

Example with Multiple Files and a Library:

Bash

g++ main.cpp functions.cpp -o myprogram -I /path/to/headers -L /path/to/libraries -lmath

Troubleshooting:

• If you encounter errors, check for typos, missing header files, or incorrect library linking.
• Use g++ --help to view a full list of compiler options.