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Function to convert null terminated string to uppercase?

Posted on 2000-03-13
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Last Modified: 2010-04-02
I'm new to C++ so the q might seem easy.
With which function I convert null terminated string to uppercase?
char *s="adac";
somefunc(s);
now *s is "ADAC"
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Question by:mdanny
7 Comments
 
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Expert Comment

by:nietod
ID: 2612369
You can use toupper() to convert a single character to uppercase.  

You can write code to convert an entire string like

void UprStr(char *str)
{
   while (*str)
   {
        *str = toupper(*str);
        ++str;
    }
}
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Author Comment

by:mdanny
ID: 2612437
Tried it.Get unhandled exception error...Also tried the function    _strupr from <string.h>
I'm using vc6,win32 console.
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Accepted Solution

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nietod earned 20 total points
ID: 2612458
_strupt is fine.  But it is not a standard function.  It is one that Microsoft provides with their compiler, but it might not be found on onther compilers.  The fucntion I wrote is portable, so it can be used on ANY compiler.

>> Get unhandled exception error
There is no problem with the function I provided.  The problem must be elsewhere in the program or in the way you are using the function.

It is not necessary to reject an answer if you simply want clarificationor additional help.  You ca simply post a comment askign for more help.
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Author Comment

by:mdanny
ID: 2612470
Sorry I found my mistake...
Thanks nietod
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Expert Comment

by:KangaRoo
ID: 2612474
nietod's function looks correct. Try with

char* src = "adac";
char* dup = strdup(src);
UprStr(dup);
cout << dup << endl;
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Expert Comment

by:nietod
ID: 2612543
>> nietod's function looks correct.
But its always hard to be sure with a function of that sort of complexity.  There may be a bug lurking somewhere.  :-)
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Expert Comment

by:Wyn
ID: 2613058
Great humour...
:)
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