Lesson 12: C Programming - How to use the return value of MAIN.

Описание: Have you ever wondered what happens when you run a C program? Well, at the heart of every C program lies a special function called "main." This function is the starting point for any C program and is executed first when you run it. But did you know that the "main" function can also return a value?

That's right, the return value of the "main" function can be used to indicate whether the program executed successfully or encountered an error. It's like a secret code that the program uses to communicate with the operating system or other programs that call it.

For example, let's say you're running a batch file that calls a C program. You can use the return value of the "main" function in the C program to determine whether the batch file should continue executing or stop. If the return value is 0, then everything went smoothly and the batch file can continue with its next command. But if the return value is anything other than 0, then something went wrong and the batch file should stop.

But why is it sometimes okay to have a "void main" instead of returning a value? Well, it's really a matter of personal preference and coding style. If you don't need to communicate anything back to the operating system or other programs, then it's perfectly fine to have a "void main." Just remember that if you ever need to communicate something back, you'll need to change your "void main" to return an integer value.

So the next time you're coding in C and wondering what to do with the "main" function's return value, remember that it's like a secret handshake between your program and the outside world. Use it wisely, and you'll be able to communicate effectively with the rest of your system.

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