How to Fix ‘Undefined Reference to main’ Error in C

This error means the compiler can't find the required main() function in your C code. Let’s explore why it happens and how to fix it. 🔍 Why This Error Occurs Missing main() function in the source file Misspelled or incorrectly defined main() Compiling the wrong file or an empty file Using main inside a library file instead of a main application file ✅ ...

How to Run C Code Online Without Installing Anything

Want to try out a C program quickly? No need to download anything — use online C compilers and run your code directly in your browser. 🔧 What is an Online C Compiler? An online C compiler is a web-based tool that lets you: Write C code Compile it on a remote server View output or errors instantly in your browser ✅ Step-by-Step: Run C Code Online Step 1: Open a Trust...

Fix 'Segmentation Fault' in Online C Compiler

🧠 What is a Segmentation Fault in C? A segmentation fault occurs when a program tries to access a memory area it shouldn't — for example, dereferencing an invalid pointer or accessing memory out of bounds. 🚨 Common Causes in Online C Compilers (and Fixes) ✅ 1. Uninitialized or NULL Pointer Dereference int *ptr; *ptr = 10; // ❌ Segmentation Fault Fix: int *ptr = (int...