Thread: Debug Assertion Error on a sprintf call

Any idea what might be causing said "Debug Assertion Error"

This function will convert the incoming number arguments to string, format them and then store them in "data".

Code:

IOLineEdit& IOLineEdit::operator=(double number){
	char theFormat [20]="%";
    strcat (theFormat, format);
    strcat (theFormat, "lf");
	sprintf((char*)data,theFormat,number);
	return *this;
}

format is a public member which holds the format of any number
for instance it will hold .2

data is a void* from my parent class

I get the "Debug Asserion Error" on the sprintf line. In the dialogue box the expression says "(STRING!=NULL)".

Appreciate any help.