I have been writing a function since I started learning C language, so do you know its standard writing method?
The main function, also known as the main function, is the starting point for program execution. What does the main function we usually write look like?
1. Is that so?
main（）{}
2. Is this still the case?
void main（）{}
3. Still like this?
int main（void）{}
4. Still like this?
int main（）{}
5. Still like this?
int main（int argc，char *argv［］）{}
There are so many ways of writing above, so which one is the correct way of writing?
Check the C89/C99/C11 standard document, which clearly fixes two ways of writing:
int main（void） { /* 。。。。。。 */ }int main（int argc， char *argv［］） { /* 。。。。。。 */ }
Therefore, other writing methods do not meet the standards. Some are historical relics, some are compiler extensions, and some are unknown where they came from.
So having said all this, for the general portability of the code, it is recommended to use the form provided by the standard, or it is recommended to use the two writing methods specified in the standard document. If a function determines that no parameters need to be passed in, then using void qualification is a good choice.
So, do you understand how to write the main function?
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