Single-line and multi-line comments in the code

Add comments to the code

C Allows us to add comments to the code in two ways.

A single-line comment start with // and ends at the end of the current line.

A multi-line comment starts with /* and ends on some later line with */.

This can be used to add explanation to the developers and maintainers of the code and also to temporarily disable some of the code.

#include <stdio.h>

// This is a comment

int main() {
    printf("Hello ");  // This is a comment too

    // We don't want the following line of code to be included:
    // printf("Hello World!\n");

    printf("World");

    /*
      A multi-line comment
      With a beginning and an end.
     */

    printf("!\n");
}

$ gcc comments.c
$ ./a.out
Hello World!

//
'/*'