Re: converting char to unsigned int - C / C++ / MFC Discussion Boards

thepersonof6-Apr-06 1:38

6-Apr-06 1:38

Hi I found that char could be converted to an interger as follows:

char c = 250;
int a = int(c)

How can I get the a value of a to be the same as what I put in? It sometimes comes out negative, although I can add 256. There is a simpler way?

thank you

Re: converting char to unsigned int

Nibu babu thomas6-Apr-06 1:43

Nibu babu thomas

6-Apr-06 1:43

thepersonof wrote:
char c = 250;

thepersonof wrote:
How can I get the a value of a to be the same as what I put in? It sometimes comes out negative, although I can add 256. There is a simpler way?

unsigned char c = 250;

Signed char limit is 127.

Nibu thomas
Software Developer

Re: converting char to unsigned int

Ștefan-Mihai MOGA6-Apr-06 1:44

Ștefan-Mihai MOGA

6-Apr-06 1:44

thepersonof wrote:
How can I get the a value of a to be the same as what I put in? It sometimes comes out negative, although I can add 256. There is a simpler way?

char c = 250;
int a = (int)(unsigned int)c;

Re: converting char to unsigned int

<color>Aljechin 6-Apr-06 1:44

<color>Aljechin

6-Apr-06 1:44

thepersonof wrote:
char c = 250;
int a = int(c)

char c = 250;
unsigned int a = (int)c;
??

Re: converting char to unsigned int

kakan6-Apr-06 1:46

kakan

6-Apr-06 1:46

Make c an unsigned char. (Yes, there are such a thing as signed and unsigned chars in C).
Or cast c to an unsigned char. So:
1.
unsigned char c = 250;
Or:
2.
int a = (int) (unsigned char) c;

Or both...

-- modified at 7:49 Thursday 6th April, 2006
OR:
int a = 250; Laugh | :laugh:

Re: converting char to unsigned int

Aqueel6-Apr-06 1:48

Aqueel

6-Apr-06 1:48

do you want the value of a to be 250 in this case?

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www.aqueelmirza.cjb.net

Re: converting char to unsigned int

thepersonof6-Apr-06 1:50

thepersonof

6-Apr-06 1:50

Thankyou ... converted to an unsigned char and it works great

Re: converting char to unsigned int

Aqueel6-Apr-06 1:55

Aqueel

6-Apr-06 1:55

Yah i misunderstood. They are right.

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www.aqueelmirza.cjb.net

Re: converting char to unsigned int

Wim Engberts6-Apr-06 1:51

Wim Engberts

6-Apr-06 1:51

union
{
char c[sizeof (int)];
int n;
} Convert;

char c = 250;
Convert.n = 0;
Convert.c[0] = c;

Then, in Convert.n you will get the proper value.

Good luck!

William

Re: converting char to unsigned int

Cedric Moonen6-Apr-06 2:00

Cedric Moonen

6-Apr-06 2:00

Geez

That's a really complicated way of doing that !

Re: converting char to unsigned int

Aqueel6-Apr-06 2:05

Aqueel

6-Apr-06 2:05

Chaa gia hai bhai!

We Believe in Excellence
www.aqueelmirza.cjb.net

Re: converting char to unsigned int

thatsme_cool6-Apr-06 2:41

thatsme_cool

6-Apr-06 2:41

Kya cha gaya hai Yar

Re: converting char to unsigned int

Aqueel6-Apr-06 2:51

Aqueel

6-Apr-06 2:51

hahahaha
What a solution yaar! Nice
Unique and innovative Big Grin | :-D

We Believe in Excellence
www.aqueelmirza.cjb.net

Re: converting char to unsigned int

toxcct6-Apr-06 2:55

toxcct

6-Apr-06 2:55

...and you said what ? Confused | :confused:

Re: converting char to unsigned int

Aqueel6-Apr-06 2:58

Aqueel

6-Apr-06 2:58

i said "Chaa gia hai bhai" which means "Great job! brother!".
This is Urdu language idiom. It is used for a person who does something great.
Smile | :)

We Believe in Excellence
www.aqueelmirza.cjb.net

Re: converting char to unsigned int

David Crow6-Apr-06 3:01

David Crow

6-Apr-06 3:01

thepersonof wrote:
int a = int(c)

A cast is actually not necessary. You could accomplish the same with:

int a = c;

because a char gets internally promoted to an int during such operations.

A char can hold values in the range -128 to 127, whereas an unsigned char can hold values in the range 0 to 255.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: converting char to unsigned int

abbiyr6-Apr-06 4:23

abbiyr

6-Apr-06 4:23

Hi there.

As the other replies have stated, you need to use the unsigned char for values above 127. To perform explicit conversions in C++, you should use the static_cast instead of the old C-Style casts.

<br />
unsigned char c = 250;<br />
int a = static_cast<int>(c);<br />

Cheers

Re: converting char to unsigned int

David Crow6-Apr-06 4:46

David Crow

6-Apr-06 4:46

abbiyr wrote:
To perform explicit conversions in C++, you should use the static_cast instead of the old C-Style casts.

For integral types, this is not necessary.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: converting char to unsigned int

abbiyr6-Apr-06 5:12

abbiyr

6-Apr-06 5:12

Quite agree.

It is not necessary, the unsigned char will be cast correctly without it. I recommended it though, as it does explicity show the intentions of the developer.

Please help: Can't install VC6++

P.Pronk6-Apr-06 0:54

P.Pronk

6-Apr-06 0:54

When installing the VC6++ compiler on my PC (Win XP),
the installation process aborts with the message
"ODBC's SQLInstalldriver manager failed".
Can somebody please help ?

Re: Please help: Can't install VC6++

YaronNir6-Apr-06 1:38

YaronNir

6-Apr-06 1:38

google search on the error message would have been nice.....

look hehe:

http://support.microsoft.com/default.aspx?scid=kb;EN-US;172701[^]

Ask not what your application can do for you,
Ask what you can do for your application

Re: Please help: Can't install VC6++

P.Pronk6-Apr-06 3:45

P.Pronk

6-Apr-06 3:45

this did not help.
I even re-installed XP again,
the problem still exists.

Re: Please help: Can't install VC6++

YaronNir6-Apr-06 3:50

YaronNir

6-Apr-06 3:50

have u tried installing the VC6 on a clean xp installation?

Ask not what your application can do for you,
Ask what you can do for your application

Re: Please help: Can't install VC6++

P.Pronk6-Apr-06 4:15

P.Pronk

6-Apr-06 4:15

Yes, that went OK.
There is something wrong with my PC, I want to find out wat it is.

Re: Please help: Can't install VC6++

YaronNir6-Apr-06 4:19

YaronNir

6-Apr-06 4:19

Good luck

Ask not what your application can do for you,
Ask what you can do for your application

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