Should we write return 0 for void function in C++?

Void functions in C do not need to return 0 because they do not return any value and control is automatically returned after executing the code block. There are two exceptions: you can return an error code when handling an error, or you can use the return statement to exit the function early.

Does the void function in C need to return 0

Answer: Not required

Detailed explanation:

void type function in C means that the function does not return any value. Therefore, they inherently do not require explicit return statements, including returning 0.

Working principle:

• When a void function finishes executing its code block, it will automatically return control to the calling function.
• In a void function, using the return statement has no practical effect and will not return any value.
• Therefore, there is no need to write a return 0 statement when writing a void function.

Exceptions:

Although void functions generally do not need to return 0, there are two exceptions:

• Handling errors: Some void functions can return error codes or exception values ​​to indicate errors. In this case, it is appropriate to use a return statement to return a nonzero value to indicate an error.
• Early return: If the void function needs to return early under certain conditions, you can use the return statement to exit the function early.

Other notes:

• void functions can have parameters, but they cannot have return value types.
• Unlike functions that return non-void values, void functions cannot use return values ​​to pass information.
• If you need to return information from a void function, consider using output parameters or throwing an exception.

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