Trying to make a 4*4 with multidimensional array

Projects Programming
1 
int led[4][4]={{2,3,4,5},{6,7,8,9}};
void setup() {
  for(int i = 2; i<=10;i++)
  {
   pinMode(i,OUTPUT);
  }
  // put your setup code here, to run once:

}

void loop() {
  for(int rows = 2; rows <= 5; rows++)
  {
    
    
    for(int colums = 6; colums <= 9; colums++)
    {
      
      digitalWrite(led[rows][colums],HIGH);
      delay(500);
      digitalWrite(led[rows][colums],LOW);
    }
  }
  // put your main code here, to run repeatedly:

}

this is my code what am i doing wrong?

2

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3 
int led[4][4]={{2,3,4,5},{6,7,8,9}};0

This array has 4 rows numbered 0 to 3 and 4 columns numbered 0 to 3

Your for loops use values from 2 to 5 and 6 to 9 as the array index values so are accessing memory outside of the array

4

look this over

output

 0 1 2
 10 11 12
 20 21 22
 30 31 32
 40 41 42

const int Nrow = 5;
const int Ncol = 3;

int matrix [5][3] = {
    {  0,  1,  2 },
    { 10, 11, 12 },
    { 20, 21, 22 },
    { 30, 31, 32 },
    { 40, 41, 42 },
};

void setup ()
{
    Serial.begin (9600);

    for (int row = 0; row < Nrow; row++) {
        for (int col = 0; col < Ncol; col++)  {
            Serial.print (" ");
            Serial.print (matrix [row][col]);
        }
        Serial.println ();
    }
}


void loop () {
}
5

What exactly are you trying to do? is it a 4x4 array of LEDs or a 2x4 array?

This {{2,3,4,5},{6,7,8,9}}; is 2x4

Arrays also start at 0 index so both of your for loops are incorrect.

You also have a single delay instead of another after you turn off the LEDs.

Try this instead.

for(int row = 0; row < 2; row++) {
  for(int column = 0; column < 4; column++) {
    digitalWrite(led[row][column],HIGH);
    delay(500);
    digitalWrite(led[row][column],LOW);
    delay(500);
  }
}
6

either you use the pins in the array, or you just use the for loops indexes as PIN numbers

for the setup it would be like this

void setup() {
  for(int i = 2; i<=10;i++) pinMode(i,OUTPUT); // pin D2 to D10 as output
}