Arduino array and if statement

Question

I have a problem. My code for Arduino is:

void count (int a){
  if (a == 0) {
    int led_pin [4] = {3, 4, 5, 6};
  }

  else{
    int led_pin [2] = {4, 5, 6, 9};
  }

  for (int i = 0; i <= 7; i++){
    digitalWrite(led_pin[i], HIGH);
  }
}

and I get output:

'led_pin' was not declared in this scope

How to declared array or change values of array?

Please read Variable Declaration. The use of array don't make sense as well, so read language reference on [array]( arduino.cc/reference/en/language/variables/data-types/array) as well. — hcheung
– hcheung, Commented May 16, 2018 at 12:16

Vinayak Shantaram Joshi · Accepted Answer · 2018-05-16 14:38:44Z

2

You are getting the error because you have bounded the scope of your led_pin variable inside the if and else condition.

Also you are trying to change the whole variable, you should not do that.

Try this out.

void count(int a){
    int led_pin[2][4]={{3,4,5,6},{4,5,6,9}};
    if( a !=0)
    {
        a=1;
    }
    for(int i=0;i<4;i++) //I don't know why you used 7 in your code.
    {
        digitalWrite(led_pin[a][i],HIGH);
    }
}

I hope this helps.

answered May 16, 2018 at 14:38

Vinayak Shantaram Joshi

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