Functions with a variable number of parameters using (...)

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Somebody asks me how to do something like this,
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so I'm posting it. Basically, its a function like 
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printf, that can take a variable number of 
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arguments, using the (...). I use something like 
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this to create a string for my graphics programs, 
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and draw the resulting string to the screen.
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// Create a string function
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void CreateAString(const char *format, ...)
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{
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 va_list list;
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 char string[1024];
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 // Create the string from the parameters
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 va_start(list, format);
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 vsprintf((char *)string, format, list);
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 va_end(list);
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 // Function to draw the string goes here
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}
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Now, the complete string is stored in 'string'. 
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To use this function, you can use something like:
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void function()
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{
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 int num1 = 10, num2 = 20;
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 CreateAString("NUM1 = %d NUM2 = %d", num1, 
        num2);
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}
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And 'string' would be:
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NUM1 = 10 NUM2 = 20
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Pretty easy. Not used real often, but it can be useful.