void-help

void means "don't return value" right? but wat does don't return value different from the normal ones.

pretend that the type of the function, i.e. the type presented before the function:

Code:

---

int blah()

---

is what is going to be replaced where the function was called.
Example:

Code:

---

int add() {
        return 1+1 ;
}

int main()
{
        int j=0;
        j=add();
        return 0;
}

---

the blue is the function being called and the type is int
in main, WHERE it is called (red) you can pretend that you can replace that location with what it returns. (1+1, or just flip the reds)

however, with void...

Code:

---

void  add()
{
        return ;
}
int main()
{
        add();
        return 0;
}

---

in the void add() function.. it doesn't return anything so, in the main, you can't replace the location where you called it with anything (the red).

I am sorry if this is unclear. I tried to explain it as simply as I could

-LC

You can use a void function for a lot of things. Say u wanted a function to just out put some information

Code:

---


void output()
{
    cout << "HEllo"<<endl;
}


int main()
{
  output();
  return 0;
}

---

If there is no meaningful value that your function could return, then it shouldn't return anything, and consequently, have a void return type.

Quote:

---

Originally posted by Zach L.
If there is no meaningful value that your function could return, then it shouldn't return anything, and consequently, have a void return type.

---

just like void main() !

just kidding

i still not understand by "return a value".Whether void or not,u will still get the value of the whole nest thing

Well I'll am not very sure but what I understand by return values is this: when you make a function, the compiler leaves space in the stack for the return value, that can be an int, a bool, a double or anything like that, but when you make a void function, it leaves no space for the return value. You may want to google what the stack is, then it will be much clear, I dont know how to explain it... sorry.