Question

If I do this:

void printfloat(float number)
{
    printf("%f", number);
}

and

void printdouble(double number)
{
    printf("%f", number);
}

What is the maximum number of characters that can be output by each function?

Answer 1

Conclusion:

I was unable to get snprintf to tell me how big the string would be, and I want to keep the code as compiler-independent as possible. So here is the solution I came up with.

char numstr[50];
sprintf_s(numstr, "%g", *value);
m_stringRepresentation += numstr;

%g outputs the number in scientific notation, which severely limits the number of characters. I picked a buffer large enough to contain anything that might output. My only compiler-dependency is on sprintf_s.