`int main` vs. `void main` in C/C : Does it Really Matter?

Does it Make a Difference to Use void main or int main in C/C ?

When declaring the main function in C or C , you have two options: int main and void main. It is essential to understand the distinction between the two.

The Correct Approach: int main

According to the C specification, int main is the proper way to define the main function. It returns an integer value,通常表示程序的退出码, used by the operating system to determine the success or failure of the program.

The Incorrect Approach: void main

void main is not a valid declaration for the main function in C . It was introduced by some older Microsoft C compilers as a deviation from the C standard. However, it has since been deprecated and should not be used.

Consequences of Using void main

Using void main instead of int main can lead to several issues:

• Unexpected Behavior: void main does not return an exit code, which can confuse the operating system.
• Compilation Errors: Modern C compilers may generate errors if you attempt to use void main.
• Compatibility Issues: Code written using void main may not be compatible with other C environments that adhere to the standard.

Therefore, it is strongly recommended to always use int main when declaring the main function in C or C . This ensures compliance with the C standard and avoids potential problems.

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