Single-line comment in C Programming Language

A single-line comment is used to write short notes or explanations in your C code.
It helps make the code more readable and document what each part does, but the compiler ignores it during compilation.

Syntax

// This is a single-line comment

• Starts with two forward slashes (//)

• Everything written after // on the same line is treated as a comment

• The compiler does not execute that part

Example 1: Simple Comment

#include <stdio.h>

int main() {
    // This program prints Hello, World!
    printf("Hello, World!");
    return 0;
}

The comment // This program prints Hello, World! is ignored by the compiler.

Output:

Hello, World!

Example 2: Inline Comment

You can also place a single-line comment after a statement on the same line.

int x = 10;  // Assign 10 to variable x