it puts '0' in every cellCode:char arr[256]={'0'};
??
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it puts '0' in every cellCode:char arr[256]={'0'};
??
No. And I'm pretty sure we've talked about this before.
--
Mats
i remember that we could put in every cell of an array one value
by a similar way
??
Listen to matsp. You can find dozens of pages explaining this in google.
PS: Really sure it's '0' and not 0?
Only to the value zero (not '0', that's the character representing the digit zero, commonly the value 48, but not guaranteed). For any constant other then zero, you will have to either enter all the 256 values [16 rows of 16, for example], or write code to fill in the values - e.g. use memset().Quote:
Originally Posted by transgalactic2
--
Mats
actually it was 0
but i though it was '0' because its a array of chars
not an array of integers
??
i cant put 0 into char array
its a number
??
Then you can't put '0' in a char array either, since it is also a number (of type int, in fact).Quote:
Originally Posted by transgalactic2
the ascii value of 0 is NULL
so it puts NULL in every cell
and i can do this shortcut
only with NULL value
can i do
Code:char arr[256]={67};//the letter that 67 represenst
'0' is a charQuote:
Originally Posted by laserlight
not a number
The null character has a value of 0, and this is true with ASCII as well. However, the macro NULL is different in meaning from the null character, even though they are equal and may have the exact same value and type. Consequently, it is usually semantically wrong to say that "it puts NULL in every cell" unless you are talking about an array of pointers.Quote:
Originally Posted by transgalactic2
This "trick" works with zero values, including NULL, because those elements of the array that are not explicitly initialised will then be zero initialised.Quote:
Originally Posted by transgalactic2
Yes, but you will end up with an array for which arr[0] has the value of 67 and the rest have the value of 0.Quote:
Originally Posted by transgalactic2
EDIT:
No, '0' is an int, and the char type is an integer type.Quote:
Originally Posted by transgalactic2
ya i just tested it works withbut fills only arra[0] not all array other will be NULLCode:char arr[256]={67}
so if want to initialize arr without a loopCode:char arr[256]={0};
i can put only NULL char in them
You could simply write out 67 256 times ;)
Or you could use memset().
Maybe even a for-loop, but memset is often more optimized. Or, if you don't mind a trailing NUL:
BTW: NULL is "(void *)0", NUL is "(char)0".Code:char arr[] = "00000000000000000000000000000000000000000000000"...;
NULL is an implementation defined null pointer constant, so whether it is 0 or (void*)0 is implementation defined. I do not think that the name NUL is actually defined in standard C.Quote:
Originally Posted by Brafil
so this is correctQuote:
Originally Posted by transgalactic2
?
Apparently not... see laserlights post below...
No. I already told you that you can use an initialiser to initialise the chars to something other than the null character, though it may be tedious to do so by hand. Stop talking about "NULL char" since it can be confused with the NULL macro, which would then obfuscate your intending meaning.Quote:
Originally Posted by transgalactic2
in the start matsp said that it
works
Code:char arr[256]={0};
Define "works"?Quote:
Originally Posted by transgalactic2
You say that you want to initialise the elements of the array to something other than the null character, then you say that an example that initialises the elements of the array to a null character "works"?
Zero yes, NULL no. Leave NULL out of this, not even in the ballpark.
i understand that other values dont works
but this value(i cant decide its name)
does puts in every cell 0Code:char arr[256]={0};
It is an int literal 0, so you can call it 0, or you can call it a null character since char is the destination type.Quote:
Originally Posted by transgalactic2
That is because arr[0] is initialised to 0, then arr[1] to arr[255] are zero initialised.Quote:
Originally Posted by transgalactic2
thanks