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What happen internally in the system when return type of main () function make as void ?

+2 votes
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If I correct , by default main () function has integer return type.
I want to know what happens in the system internally when its return type gets changed from integer to void ?

posted Jan 13, 2016 by Vikram Singh

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1 Answer

0 votes

we use int main() for C Programming but void main() works as well as int main() do. Operating systems pass the return value that sometimes called exit status to the calling program.Compilers will accept void main, but this is a non-standard extension (it usually means "always return zero to the OS" so explicitly void main return status 0 to operating systems same as after successful completion form any int main() function.

answer Jan 27, 2016 by Shivam Kumar Pandey
Hi Shivam, you answered very well. Could you please share some sort of references like online references/books/blogs etc ?
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Many a times in C we get these two type of main function one had void as parameter one has none. Now the question is what is the difference between these two?

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There are two files.

    #include <stdio.h>
    void fun1(int i)
    {
            int a;
            printf("Enter the number\n");
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/* INPUT  */    
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What will be in file in OUTPUT file both cases.
Case-1:

./a.out < INPUT  > OUTPUT 

Case-2: Entered value is "18" from key board.

./a.out > output
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