Converting Char array to Int array

Is there a way I can easily convert a char array into an int array,
without having to cast each value in the array to an int and copying
it to a new array?

Thanks for any help :)

re: Converting Char array to Int array

"Tricky" <Trickyhead@gmail.comwrote in messageBasically no. On some very unusual machines sizeof(char) == sizeof(int) and
so you can reinterpret the bits. However generally you've got to add extra
padding within the array because it consists of two or, more usually, four
bytes.

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re: Converting Char array to Int array

Tricky wrote:It depends on what you mean by "convert." Please describe
exactly what you have, and exactly what you want to get.

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Eric Sosman
esosman@ieee-dot-org.invalid

re: Converting Char array to Int array

On Feb 4, 4:31 pm, Eric Sosman <esos...@ieee-dot-org.invalidwrote:Ive read all of the data out of a Bitmap (Im ignoring anything other
than 8 bits). Because I may want to manipulate them as if they were 10
bit values I need to store them into something wider than a char
array.

No need to worry about the 10 bit thing, I know Im going to have to
bit shift them all left by 2 once they are in the int array. Its just
getting the values into the int array in the first place.

re: Converting Char array to Int array

Tricky wrote:
) Ive read all of the data out of a Bitmap (Im ignoring anything other
) than 8 bits). Because I may want to manipulate them as if they were 10
) bit values I need to store them into something wider than a char
) array.
)
) No need to worry about the 10 bit thing, I know Im going to have to
) bit shift them all left by 2 once they are in the int array. Its just
) getting the values into the int array in the first place.

If you have to bit shift them anyway, then why can't you copy them
while you're at it ?


SaSW, Willem
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re: Converting Char array to Int array

Tricky wrote:Since you need each value in a form different than the
one you read, you need to convert it explicitly to that new
form. There's no "bulk conversion" operator.

unsigned char orig[N];
unsigned int new[N]; /* or maybe unsigned short? */
int i;
/* read orig[] values */
for (i = 0; i < N; ++i)
new[i] = orig[i]; /* or mabye orig[i] << 2? */

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Eric Sosman
esosman@ieee-dot-org.invalid

re: Converting Char array to Int array

Tricky wrote:Run the program on a machine where CHAR_BIT exceeds 15 and
sizeof(int) is 1. :-)

Of course you can eliminate the cast on any machine.

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re: Converting Char array to Int array

CBFalconer wrote:
On the DS9K, sizeof(int) is 1, but int is two's complement and char is
sign-and-magnitude. :-)


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re: Converting Char array to Int array

Tricky:


Nope, not on a system where char and int are different sizes and have
different representations. You'd have to go with something like:

int nums[50] = { /* numbers */ };

char signed byte_nums[50];


int const *src = nums;

char signed *dest = byte_nums;
char signed const *const destend = *(&byte_nums+1);

do *dest++ = *src++;
while (destend != dest);

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Tomás Ó hÉilidhe