Several ways of writing main function in C

Hello everyone , I meet you again , I'm your friend, Quan Jun .

1、 The most standard way of writing

#include <stdio.h>

int main()
{
    printf("Hello World! ");
    return 0;
}

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2、 hold int Switch to void

#include <stdio.h>

void main()
{
    printf("Hello World! ");
    return 0;
}

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3、 Don't write int

#include <stdio.h>

 main()
{
    printf("Hello World! ");
    return 0;
}

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4、 Don't write return

#include <stdio.h>

int main()
{
    printf("Hello World! ");

}

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The above four writing methods all run successfully .

There are many reasons for not reporting errors

• C At first, language was just a norm and standard ( for example C89, C11 etc. )
• The implementation of standards needs the support and implementation of major manufacturers
• In the implementation of support, due to the interests of major manufacturers 、 Understanding and other issues , Resulting in different standards for implementation , There is a change
  • Turbo C
  • Visual C(VC)
  • GNU C(GCC)
• That's why you can see that different books have different writing formats , Some return int, Some return void, Some even have no return value

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