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C++ Programming General discussions for the C++ language. For questions specific to Microsoft's Visual C++ variant, see the Visual C++ forum instead.
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  #1 (permalink)  
Old February 20th, 2004, 08:09 PM
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Default Converting int to string

 I am writing a lexical analyser in C. I need to know how to convert integer to string . The other way round I can do it.

Thanks

judex

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Old February 21st, 2004, 05:15 AM
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Hi. I use the following code to do this in Visual C++. Maybe you can use it. I am sure there are better ways to do this, but it works for my purposes. (It is not my code, but you may use it...)

Code:
CString CYourClass::IntToString(int number)
{
    int i=0;
    int antdes=0;    // = number of digits
    CString temp;
    BOOL negsign=FALSE;

    if(number<0)
    {
        negsign=TRUE;
        number=abs(number);
    }

    temp.Empty();
    if(number>9999999999999999999)
        antdes=20;
    else if(number>999999999999999999)
        antdes=19;
    else if(number>99999999999999999)
        antdes=18;
    else if(number>9999999999999999)
        antdes=17;
    else if(number>999999999999999)
        antdes=16;
    else if(number>99999999999999)
        antdes=15;
    else if(number>9999999999999)
        antdes=14;
    else if(number>999999999999)
        antdes=13;
    else if(number>99999999999)
        antdes=12;
    else if(number>9999999999)
        antdes=11;
    else if(number>999999999)
        antdes=10;
    else if(number>99999999)
        antdes=9;
    else if(number>9999999)
        antdes=8;
    else if(number>999999)
        antdes=7;
    else if(number>99999)
        antdes=6;
    else if(number>9999)
        antdes=5;
    else if(number>999)
        antdes=4;
    else if(number>99)
        antdes=3;
    else if(number>9)
        antdes=2;
    else 
        antdes=1;
    for(i=0;i<antdes;i++)
    {
        temp+=(char)((number%10)+48);
        number/=10;
    }
    if(negsign)
        temp+="-";
    temp.MakeReverse();
    return temp;
}
Gert
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Old February 24th, 2004, 11:56 AM
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If you want to implement a function to convert an integer to a string,
there are lots of ways. Is this what you want to do?

If your assignment is to write a lexical analyser in C, then I
would assume you can use standard C functions, such as sprintf(),
which is declared in <stdio.h>.

Look it up.

Dave

Quote:
quote:Originally posted by Judex
  I am writing a lexical analyser in C. I need to know how to convert integer to string . The other way round I can do it.

Thanks

judex

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Old March 1st, 2004, 10:44 AM
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Default

There are lots of ways...
Example in C:
itoa(value, string, radix);
value: Number to be converted
string: String result
radix: Base of value, must be in the range 2 – 36


Quote:
quote:Originally posted by Judex
  I am writing a lexical analyser in C. I need to know how to convert integer to string . The other way round I can do it.

Thanks

judex

Thiago Falcão
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