How to pass array to function in Arduino
How to pass an array to a function in Arduino?
Answer
There are two ways to pass array to a function on Arduino
- Pass Array by Array Type
- Pass Array by Pointer Type
Pass Array to a Function by Array Type
Example code
void myFunction(int myArray[], int length) {
for (byte i = 0; i < length; i++) {
Serial.println(myArray[i]);
}
Serial.println(); // add an empty line
}
int array_1[2] = {1, 2};
int array_2[4] = {1, 2, 3, 4};
void setup() {
Serial.begin(9600);
myFunction(array_1, 2);
myFunction(array_2, 4);
}
void loop() {
}
The output on Serial Monitor:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
1
2
1
2
3
4
Pass Array to a Function by Pointer Type
Example code
void myFunction(int *myPointer, int length) {
for (byte i = 0; i < length; i++) {
Serial.println(*(myPointer + i));
}
Serial.println(); // add an empty line
}
int array_1[2] = {1, 2};
int array_2[4] = {1, 2, 3, 4};
void setup() {
Serial.begin(9600);
int pointer_1 = &array_1;
int pointer_2 = &array_2;
myFunction(pointer_1, 2); // pass via a pointer
myFunction(pointer_2, 4); // pass via a pointer
}
void loop() {
}
The output on Serial Monitor:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
1
2
1
2
3
4
See Array reference
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