What do the [] mean?

[computergoblin]

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

RF24 radio(7, 8); // CE, CSN

const byte address[6] = "00001";

void setup() {
  radio.begin();
  radio.openWritingPipe(address);
  radio.setPALevel(RF24_PA_MIN);
  radio.stopListening();
}

void loop() {
  const char text[] = "Hello World";
  radio.write(&text, sizeof(text));
  delay(1000);
}

So I’m look at this code for an RF24L0I module (Wireless receiver monitor). I don’t really use arrays a lot and I’m kind of confused about the use of [ ] in this code since I know [ ] brackets are generally used for arrays but I don’t see them defining an array

[J-M-L]

@computergoblin

const char text[] = "Hello World";

If this is this one, it means create an array and let the compiler calculate the size based on the initial value (here a cString)

[computergoblin]

Ohhhh! That make so much more sense

[J-M-L]

[GolamMostafa]

@computergoblin

I don’t really use arrays a lot and I’m kind of confused about the use of [ ] in this code since I know [ ] brackets are generally used for arrays but I don’t see them defining an array

1. Probably, you are familiar with this type of array declaration:

char myName[] = {'V', 'i', 'c', 't', 'o', 'r', '\0'};

2. The above declaration can also be written as follows:

char myName[] = "Victor"; //Null-character ('\0') is automatically inserted at the end

[J-M-L]

@GolamMostafa

Probably, you are familiar with this type of array declaration:

Probably not. I think OP was expecting the size to be provided

[GolamMostafa]

@J-M-L

I think OP was expecting the size to be provided

Yes! The OP has accepted your answer as the solution.

I gave focus on defining an array of his post.