Go Down

Topic: function of type integer array (Read 4757 times) previous topic - next topic


Jun 10, 2007, 01:59 pm Last Edit: Jun 10, 2007, 02:00 pm by haesslich Reason: 1
i want to randomize an array of 8 integer numbers.
an elegant way would be a function from the type of an array of integer numbers which returns a randomized array.

in this case i could call the randomize function easily:
ExistingArray = RandomFunction;

i just right now do not remember how to do this.
i tried a declaration in the style of
Code: [Select]
int[8] randomize(int k){
 for (int i=0; i<k; i++){
   randomize[i] = random(0,1);
 return randomize;

but this is not quite correct ;)


It's probably easier to pass the array as a parameter into the function - any values you assign to it within the function will carry over to the calling function.  If you want to return an array from a function, you start needing to deal with allocation and deallocation of memory.


You might find something of use in this approach too.



Jun 24, 2007, 11:41 am Last Edit: Jun 24, 2007, 12:14 pm by tonybarry Reason: 1
I would be very grateful if forum gurus could post a short piece of code that does send an array to a function, and then return a modified array back to the calling routine.  That is, similar to the code provided by haesslich (but which works correctly).

i.e. a piece of code like this but which has correct syntax:-

void(loop) {
int sourceValues[6] = {0,1,2,3,4,5};

int[6] FunctionWhichOperatesOnSourceValueArray(int[6]) {
byte counter = 0;
for (counter = 0; counter < 6; counter ++) {
return array somehow



Jun 25, 2007, 11:00 pm Last Edit: Jun 25, 2007, 11:01 pm by mellis Reason: 1
You don't actually need to return the array from the function.  Just modify the one that got passed in, and the changes will be reflected in the calling function.


Code: [Select]
int pins[] = { 2, 3, 4 };

void incrementArray(int arr[], int length)
 for (int i = 0; i < length; i++) {
   arr[i] = arr[i] + 1;

void setup()
 incrementArray(pins, 3);
 // now pins is { 3, 4, 5 }

void loop()
 // ...

Go Up