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[c++] How can I delete the last character in a char array?
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gogodr
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Posted: Mon Jul 30, 2012 6:53 pm Post subject:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

What would the difference be between a string and a char array?

String is like a sentence (Like "Fuck you")

Char array is a series of characters (Like "F", "u", "c", "k", " ", "y", "o", "u")

Char array = wastes less memory
String = more memory

yeah I know what a string is I was just wondering since "char"(characters obv.), characters would be what a string consisted of; letters, symbols, numbers.

I was just wondering why there was a difference like that.

A char can be anything, a symbol/letter/etc... The only real reason I see it's good for is saving very small amount of data (Like saving an item on a game, and the item has a number id which is converted to a char), or memory management.

If it's just a number ID why not just store it as an integer variable?

Memory management. char = 1 byte, int = 4 bytes (or something like that)

I really doubt a char is 1byte

Fafaffy
Cheater

Reputation: 65

Joined: 12 Dec 2007
Posts: 28

Posted: Mon Jul 30, 2012 6:54 pm Post subject:

gogodr wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

What would the difference be between a string and a char array?

String is like a sentence (Like "Fuck you")

Char array is a series of characters (Like "F", "u", "c", "k", " ", "y", "o", "u")

Char array = wastes less memory
String = more memory

If it's just a number ID why not just store it as an integer variable?

Memory management. char = 1 byte, int = 4 bytes (or something like that)

I really doubt a char is 1byte

http://uk.answers.yahoo.com/question/index?qid=20081102023710AAZC6N3

gogodr
I post too much

Reputation: 125

Joined: 19 Dec 2006
Posts: 2041

Posted: Mon Jul 30, 2012 6:57 pm Post subject:

oh wait yeah you might be right, I was thinking in bits

bfsdbsdfbdsfb
Grandmaster Cheater

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Joined: 06 Sep 2007
Posts: 702
Location: Oh noez.

Posted: Mon Jul 30, 2012 7:08 pm Post subject:

blablfy. wrote:

gogodr wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

What would the difference be between a string and a char array?

String is like a sentence (Like "Fuck you")

Char array is a series of characters (Like "F", "u", "c", "k", " ", "y", "o", "u")

Char array = wastes less memory
String = more memory

If it's just a number ID why not just store it as an integer variable?

Memory management. char = 1 byte, int = 4 bytes (or something like that)

I really doubt a char is 1byte

http://uk.answers.yahoo.com/question/index?qid=20081102023710AAZC6N3

1bit = 0 or 1
2bits = 0, 1, 2 or 3
3 bits = 0, 1, 2, 3, 4, 5
so on so forth right?
So with 8 bits being 1 byte there would be stuff you couldn't store in char?
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bsdfbdsfb

Fafaffy
Cheater

Reputation: 65

Joined: 12 Dec 2007
Posts: 28

Posted: Mon Jul 30, 2012 7:15 pm Post subject:

akaecius wrote:

blablfy. wrote:

gogodr wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

What would the difference be between a string and a char array?

String is like a sentence (Like "Fuck you")

Char array is a series of characters (Like "F", "u", "c", "k", " ", "y", "o", "u")

Char array = wastes less memory
String = more memory

If it's just a number ID why not just store it as an integer variable?

Memory management. char = 1 byte, int = 4 bytes (or something like that)

I really doubt a char is 1byte

http://uk.answers.yahoo.com/question/index?qid=20081102023710AAZC6N3

1bit = 0 or 1
2bits = 0, 1, 2 or 3
3 bits = 0, 1, 2, 3, 4, 5
so on so forth right?
So with 8 bits being 1 byte there would be stuff you couldn't store in char?

1 byte = 256 combinations

1 bit = 0 or 1
2 bits = 00, 01, 11, 10
etc...

gogodr
I post too much

Reputation: 125

Joined: 19 Dec 2006
Posts: 2041

Posted: Mon Jul 30, 2012 7:22 pm Post subject:

akaecius wrote:

blablfy. wrote:

gogodr wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

What would the difference be between a string and a char array?

String is like a sentence (Like "Fuck you")

Char array is a series of characters (Like "F", "u", "c", "k", " ", "y", "o", "u")

Char array = wastes less memory
String = more memory

If it's just a number ID why not just store it as an integer variable?

Memory management. char = 1 byte, int = 4 bytes (or something like that)

I really doubt a char is 1byte

http://uk.answers.yahoo.com/question/index?qid=20081102023710AAZC6N3

1bit = 0 or 1
2bits = 0, 1, 2 or 3
3 bits = 0, 1, 2, 3, 4, 5
so on so forth right?
So with 8 bits being 1 byte there would be stuff you couldn't store in char?

1bit= 01
2bit = 0123
3bit = 01234567
4bit = 0123456789ABCDEF
you get the idea

Andyroo
Grandmaster Cheater

Reputation: 2

Joined: 04 Jul 2006
Posts: 964

Posted: Tue Jul 31, 2012 1:02 am Post subject:

lets say you have a char array char temp[10] then create a new char array, then copy the substr of temp into it. char temp2[9] strncpy(temp2, temp, 9); make sure you use strncpy, or you'll try to copy a big array into a small array and get a compiler error. if you want to make a dynamic char array, then you want to do char *temp2 = new char[strlen(temp)]; and copy into that. edit: err you could just put a '\0' where the last char is too LOL looks like you solved it.

gogodr
I post too much

Reputation: 125

Joined: 19 Dec 2006
Posts: 2041

Posted: Tue Jul 31, 2012 11:40 am Post subject:

putting null at the end of the array doesnt make it smaller though ...

Slugsnack
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Posts: 1857

Posted: Wed Aug 01, 2012 10:03 am Post subject:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

blablfy. wrote:

akaecius wrote:

What would the difference be between a string and a char array?

String is like a sentence (Like "Fuck you")

Char array is a series of characters (Like "F", "u", "c", "k", " ", "y", "o", "u")

Char array = wastes less memory
String = more memory

If it's just a number ID why not just store it as an integer variable?

Memory management. char = 1 byte, int = 4 bytes (or something like that)

the size of an int is implementation defined. for more information on what the standard does define, see here

also with regards to size:

Code:

char[] str = "adsf";
char * str = "asdf";

both require 5 bytes (4 bytes for characters + 1 byte for null terminator).

almost everything i've seen in this thread so far is wrong

gogodr
I post too much

Reputation: 125

Joined: 19 Dec 2006
Posts: 2041

Posted: Wed Aug 01, 2012 11:42 am Post subject:

how is using malloc to reduce the size wrong?

Fafaffy
Cheater

Reputation: 65

Joined: 12 Dec 2007
Posts: 28

Posted: Wed Aug 01, 2012 12:42 pm Post subject:

I'm horrible with C++ and stuff, so nothing I say you should trust Razz

What I was trying to imply was:

Instead of having a item id like this:

Code:

int item = 100;

You could store the item number as an ascii char
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Brillia wrote:

I FUCKING FUCK SEX

Andyroo
Grandmaster Cheater

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Joined: 04 Jul 2006
Posts: 964

Posted: Wed Aug 01, 2012 2:21 pm Post subject:

gogodr wrote:

putting null at the end of the array doesnt make it smaller though ...

he was asking how to delete the last character.

gogodr
I post too much

Reputation: 125

Joined: 19 Dec 2006
Posts: 2041

Posted: Wed Aug 01, 2012 2:55 pm Post subject:

Andyroo wrote:

gogodr wrote:

putting null at the end of the array doesnt make it smaller though ...

he was asking how to delete the last character.

my point is that he is not deleting it, he is replacing it

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