Best Online Websites to Compile & Debug C/C++ with GDB

1. OnlineGDB (Recommended)

🔗 Website: Search for “OnlineGDB” on Google (onlinegdb.com)
OnlineGDB provides:

• GCC Compiler for C and C++

• GDB debugger (step-by-step execution)

• Breakpoints, watch variables, memory view

• Online code editor with input/output window

Steps to Compile & Debug Using OnlineGDB

1. Open OnlineGDB

2. Select language:

   • C → C (GCC 9.2.0)

   • C++ → C++ (GCC 9.2.0)

3. Write or paste your code.

4. Click Run to compile and execute.

5. Click Debug to open GDB mode.

6. Set breakpoints by clicking on the line numbers.

7. Use debug controls:

   • ▶ Run

   • ⏭ Step Over

   • 🔽 Step Into

   • ⏹ Stop

   • 🔍 Watch variables