Sprintf

Code:

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const oofloat & oofloat::operator += (const oofloat & str)
{

    oofloat copystring(str);        // copy to avoid aliasing problems

        oofloat size = (atof(CString) + str.converttofloat());
        size = size.length();

    int newLength = size.converttofloat(); // size of totaled number
    int lastLocation = length();            // index of '\0'

    // check to see if local buffer not big enough
    if (newLength >= Capacity)
    {
        Capacity = newLength + 1;
        char * newBuffer = new char[Capacity];
        strcpy(newBuffer,CString); // copy into new buffer
        delete [] CString;            // delete old string
        CString = newBuffer;
    }

    // now add str (copystring) to the integer value of CString
        //itoa( (atof(CString) + copystring.converttofloat()), CString, 10 );
    sprintf ( CString, "%f", (atof(CString) + copystring.converttofloat()) );


    return *this;
}

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At this line: //itoa( (atof(CString) + copystring.converttofloat()), CString, 10 );

That is what I was doing when I was doing a class similar to this, only with an integer. Now, I can't use "ftoa" because it doesn't exist, and the other functions I could find don't do what I want. However, another code sample someone gave me (used in my integer class) used sprintf. I tried to use it in

sprintf ( CString, "%f", (atof(CString) + copystring.converttofloat
()) );

so that I could store the double as a string. That works, but it gives me a memory violation. And on the other parts of the program; I have code like this:

Code:

---

const oofloat & oofloat::operator += ( double rhs )
{
    double hold = atof(CString) + rhs;
       
        char s[10];
    sprintf ( s, "%f", hold );

    return operator= ( s );
}

---

I need a replacement for sprintf there, too.

Thank you for the help!

Is there any similar command to sprintf or itoa that can be used with a double?

Use %Lf in sprintf to handle a double.

sprintf ( CString, "%Lf", (atof(CString) + copystring.converttofloat()) );

CString is a dynamically allocated variable.

an itoa version of it works fine, only it doesn't end as a float

I still get a write error, so I guess I can't put it into CString like that.

What function can I use to get arround this read error?

File one

File 2

File 3 (open this one and compile it)

If you want an alternative to sprintf replace

sprintf ( CString, "%Lf", (atof(CString) + copystring.converttofloat()) );

with

stringstream ss;
ss << atof(CString) + copystring.converttofloat();
ss >> CString;

including sstream.

Or else you can keep sprintf and try different format specifiers ('g' seemed to work) and shouldn't converttofloat return a float/double and you need to read up on proper use of header files amongst other things.

I'm not getting any errors except the run time one.

It is getting a read memory error, I think. itoa worked on my integer version of this.

Sprintf would work if I put it into a buffer and then transfered that to CString, but I don't know a good way to do that.

I should reallocate space for it, correct?

Thanks!

You're getting a memory error because by using "%Lf" as a format specifier you are generating a string that is too long. This demonstrates -

Code:

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        double d = 1.;
        char c[3];
        sprintf(c,"%lf",d);

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