Reusing arrays

[Mike200]

Hello again, are there any co
nsiderations when reusing arrays?. By reusing I mean assigning a new set of values after already declaring and using once?

Int B1 = {3,4,5,6,7}; // declared and used once

Then ideally I would like to do something like this

B1[]={10,12,13,15,20}; // my compiler doesn't like this?

Not B1[0]=10;
B1[1]=12;
Etc

Or do I use pointers in some way?

[Galik]

You can only use the initialiser list {3,4,5,6,7, ...} once when you define your array. After that you need to assign values individually:

B1[2] = 7;

[R0mai]

Alternatively you can use a temporary array, then copy the values back into the original, and hope the optimizer can inline the std::copy call, and unroll the loop.

int a[3] = {1, 2, 3};
//...
const int temp[3] = {4, 5, 6};
std::copy(temp, temp+3, a);

Or wait for the new C++0x standard, and use std::initializer_list.

[Mike200]

I'm quite surprised by that?? ,I thought there would be a way, just I didn't know how!
Can the addresses of each element in the array be accessed by pointer manipulation?

[Cody39e]

you can copy elements of one data onto other by following way -

int array[5] = {1,2,3,4,5};
int temp[5] = {6,7,8,9,10};

for(int i =0;i<5;i++)
{
array[i] = temp[i];
}

B1[]={10,12,13,15,20}; // my compiler doesn't like this?
That is illegal, when declaring an array you must specify the size which would remain fixed throughout the prorgam.

Why don't you use vector...