C_Comments.c

Here's the code with comments added along with explanations:

#include <stdio.h>  // Preprocessor directive to include the standard input-output library

int main() {  // Main function where program execution begins
    // This is a single-line comment explaining that the next line prints a message.
    
    /* This is a multi-line comment.
       Multi-line comments allow you to add detailed descriptions or
       explanations across several lines. */
    
    printf("Comments in C.\n");  // Prints the message "Comments in C." followed by a new line
    
    return 0;  // Returns 0 indicating that the program executed successfully
}

Explanation:

• #include <stdio.h>: This line includes the Standard Input Output library (stdio.h) which is necessary for using functions like printf.
• int main(): The main function is the entry point of the program. It's where the program starts executing.
• printf("Comments in C.\n");: This function call prints the string "Comments in C." to the console, followed by a newline (\n).
• return 0;: This statement returns 0 to indicate successful execution of the program.

Comments are useful to document and explain what the code is doing, making it easier for others (and yourself) to understand and maintain the code.