Defining array elements all at once

Projects Programming
1

I want to use an array of integers to define positions on a touch screen. As different images appear on the screen, I need to alter the array to reflect different touch positions. Now when I first define an array, I can use

int touchPos[10] = {1, 2, 3, ..., 10}

which is a nice succinct way to set the elements.

But then anywhere else in the program, I can't do this again, or the compiler accuses me of redeclaring a variable.

The only alternative I know of is to redefine the elements of the array one by one. So my question is, is there a way of quickly redefining a whole array like this with one line, or, failing that, can I "undefine" this array somehow, so that the initial declaration statement can be used more than once.

2

I don't know for sure but maybe the memcpy function can do what you want.

memcpy reference

4

But at 16,000,000 instructions per second, the Arduino can make it look like it happened instantly, even if it actually only processes one at a time.

5 
// probably want to use PROGMEM here

int defaultTouchPos[10] = {1,2,3,4,5,6,7,8,10};
int touchPos[10];

void resetTouch() {
  memcpy(touchPos, defaultTouchPos, sizeof(touchPos));
}

void setup() {
  // initialise touch pos
  resetTouch();
}

See: avr-libc: <string.h>: Strings

6

I would use a pointer to an array. You could then point the pointer at the array that matches the current screen.