Thread: Making own output/input device

How would someone design a function like cout or printf().
I tried void, but it didn't output anything.

Code:

void dln(" ")
{
cout << " ";
}

Thats just an example. I know you wouldn't be able to use

Code:

dln("Hello world\n");

But i was hoping it would output a letter or something.

Like this?

Code:

void myprint(char* blah)
{
    cout << blah;
}

hey! Thats *kinda* what mine looked like! except i called mine void c(char* 'text')
maybe i shouldn't use 'text' and use text.

I'm surprised that char * 'text' didn't give you an error when you compiled it. You should only use alpha-numeric characters for variable names.

yea, maybe. All it did was not output.

why do that though? it bloats the program and its pointless...

because i want to master voids.

What do you mean? A function returning void doesn't return a value. Done - voids mastered...

Don't get an attitude with. Watch your tone bud. Not sure which sounds more threatening, so pick one yourself.

Im still a newbie. I've been programming text games this whole time while getting impssible to compile dos VGA graphics tutorials from Game tutorials.com! Alot of times when i make a void, it won't work.

> so pick one yourself.

OK... Chill.

I'm just saying that it's just a datatype. If a function is specified to return void, it doesn't return a value to whatever called it. There's not really anything to "master" there.

Okay, im chillin'.... NO IM NOT!. LOL. Okay, when i have a program like this:

Code:

void checknumber();
int main
{
...
}
void checknumber()
{
...
}

Why would this error pop up:
line 56: checknumber() undeclared (first use this function

????

Where's line 56? Is it above where checknumber's defined?

the whole program:

Code:

#include <iostream>
void checknumber();
using namespace std;
int input;
int main()
{
while (1)
{
cout << "Enter a number: ";
cin >> input;
checknumber();
}
}
void checknumber()
{
cout << "The number you edited is: " << input << ".\n";
}

See, no line 56
Compiler errors like that totally peeve me.

You suuuure there's no line 56? Compilers dont make errors up...

17 line file