I'm a new programmer here, in my class I have just learn the void main() statement, sometimes when I see you guys using int main(void), I couldn't get it, can someone explain it for me?

Secondly, I have written a program which pretty long FOR ME, but still have error with it, can I post the whole coding here for you guys to help me to check??

: I'm a new programmer here, in my class I have just learn the void main() statement, sometimes when I see you guys using int main(void), I couldn't get it, can someone explain it for me?

void main() is not valid C or C++.

According to the language standard (for both language) main must return int.

: : I'm a new programmer here, in my class I have just learn the void main() statement, sometimes when I see you guys using int main(void), I couldn't get it, can someone explain it for me?
:
: void main() is not valid C or C++.
:
: According to the language standard (for both language) main must return int.
:

Upon termination, your program needs to return its status to the host OS to signify whether it completed successfully or not. Although void main was ok in the C-89 standard, it was declared invalid in the C-99 standard I *think*, and most modern ANSI compliant compilers will warn you with void or simply main().

int main() // ok for c++ void arguments are implied
int main(void) /* required for C programs IIRC */
int main(int argc, char *arv[]) // valid for either C or C++ and accepts command line arguments.

void function does not return any value
If u r simply to print out and send ctrl back to main use void.
However if u r 2 return a value use any other reqd returntype.

Try it to explain urself:


#include<stdio.h>
void print();
void hello();
void hi();
void bye();

void main()
{
print();
hello();
hi();
bye();
}
void print()
{
printf(" \n This is Me");
}

void hello()
{
printf(" \n Hello, ");
}
void hi()
{
printf(" Welcome to Programmers Gallery");
}

void bye()
{
printf(" \n C U Again");
}


Consider another snippet:

#include<stdio.h>
int main()
{
int sqr(int);
int a,b;
printf("\n Enter a number");
scanf("%d",&a);
b=sqr(a);
printf("\n The square of %d is %d",a,b);
return 0;
}
int sqr(int x)
{
int c;
c=x*x;
return (c);
}

: void function does not return any value
: If u r simply to print out and send ctrl back to main use void.
: However if u r 2 return a value use any other reqd returntype.

This is not correct. See Eric Tetz's posting in response to the original question. main must return int.

Matt.

: void function does not return any value
: If u r simply to print out and send ctrl back to main use void.
: However if u r 2 return a value use any other reqd returntype.
:

if you are using a very very old compiler such as Turbo C, you can get way with that. Modern compilers no longer support that construct without producing either a warning or an error.

http://users.footprints.net/~kaz/cppvoidmain.html

4. The main function is required, by a diagnosable semantic rule, to 
have a return type of int. This is stated in clause 3.6.1 (Main 
function): 

[The main function] shall have a return type of type int, but
 otherwise its type is implementation-defined.  Therefore, a program which
 declares main to return something other than int is an ill-formed 
program, because it violates a semantic constraint rule which is not
 accompanied by the words ``no diagnostic is required''. Upon
 processing the erroneous construct, the C++ implementation is required 
to emit a diagnostic, rather than behave in an undefined manner.