String problems

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Originally Posted by chibicitiberiu

Than how do I do that? I don't really know how to allocate memory, i know very few information about pointers.
How do I know how much memory will this string need?

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You assumed that you did know how much memory by doing this:

Code:

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for (i=lastslash;i<=strlen(pat);i++)
        filename[i-lastslash]=pat[i];

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So how big were you expecting the filename string to be in the code above? Whatever that is, you need to create or have access to a buffer of that size first before this code is invoked.

Once you know that, then you use new[] and delete[] to allocate and deallocate memory. But as JohnW pointed out, it would be much worth your while to write a string class and use that instead. But that requires you know how to use dynamic allocation (new[]/delete[]).

Regards,

Paul McKenzie

Try this updated simple string class (with demo).
It should supply most of your needs.

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Originally Posted by JohnW@Wessex

Try this updated simple string class (with demo).
It should supply most of your needs.

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Thanks, but this doesn't work in my compiler, it says "Syntax error" at the lines where is declared "bool ...".

Now I have a question... will console programs made in MS Visual Studio (2005) work on MS-DOS machines? Because I see that this old compiler is good for trash...

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Originally Posted by chibicitiberiu

Thanks, but this doesn't work in my compiler, it says "Syntax error" at the lines where is declared "bool ...".

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A "bool" is a C++ type denoting values true or false. This shows that your compiler is so old, it is practically worthless. Change the "bool" to int if you have to, and wherever you see "false" being assigned to it, replace it with 0, and if "true", replace with 1.

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Now I have a question... will console programs made in MS Visual Studio (2005) work on MS-DOS machines? Because I see that this old compiler is good for trash...

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No. MS-DOS is a 16-bit OS, and Visual Studio 2005 makes 32-bit programs.

You could get a better compiler for 16-bit DOS here:

www.digitalmars.com

Regards,

Paul McKenzie

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Originally Posted by chibicitiberiu

Thanks, but this doesn't work in my compiler, it says "Syntax error" at the lines where is declared "bool ...".

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Microsoft defined TRUE, FALSE & BOOL before 'bool' was part of the standard. You could do something similar.

const int TRUE = 1;
const int FALSE = 0;
typedef int BOOL;

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Originally Posted by Paul McKenzie

You could get a better compiler for 16-bit DOS here:
www.digitalmars.com

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That looks like a good option. It appears to support the STL too.