two array questions

Is there a way to set all the elements of an array to a certain number, say 1, without doing something like

Code:

hello[] = (1, 1, 1, 1, 1, 1, 1, 1, 1...)

?

Currently I'm using (for a 3 by 3 array)

Code:

int cx = 0;
int cy = 0;

while (cy != 3)
{
array[cx][cy] = 1;

if (cx == 2)
{
cx = 1;
cy++;
}
else
{
cx++;
}
}

and it's terribly bulky.

Also, if you want to pass an array to a function, do you do something like

Code:

int main()
{
int *ptr;
ptr = array;
function(ptr);
...
int function(int ptr)

or just

Code:

int main()
{
function(array)
...
function(int *array)

?

Originally Posted by |Wiz|

Is there a way to set all the elements of an array to a certain number, say 1, without doing something like

Code:

hello[] = (1, 1, 1, 1, 1, 1, 1, 1, 1...)

there's no way to initialise them to 1 without doing that, but you can set them using memset

Code:

memset(hello, 1, sizeof(hello));

Originally Posted by |Wiz|

Also, if you want to pass an array to a function, do you do something like

Code:

int main()
{
function(array)
...
function(int *array)

?

yes. do the second one.

there's no way to initialise them to 1 without doing that, but you can set them using memset

Only if he wants to set each byte to 1. If, for example, he wants to set each element of an integer array to one memset won't work properly.

Originally Posted by JaWiB

Only if he wants to set each byte to 1. If, for example, he wants to set each element of an integer array to one memset won't work properly.

very true. In that case ye olde for loop comes to the rescue...

You should be using vector (or tr1::array), which happens to have a constructor that does that for you:

Code:

// Single array with 'size' values
std::vector<int> hello(size, 1);
// 3x3 array
std::vector<std::vector<int> > array(3, std::vector<int>(3, 1));