CODEWITHSUNDEEP
c++
Kunal Katiyar
Kunal Katiyar

Reputation: 404

C++ finding index of value in array

I have recently started working with the Arduino (which is C++).

When I run the below function (along with other code):

int index(int val,int list) {
      int i;
      for (i = 0; i < 8; i++) {
        if (val == list[i]) {
          return i;
        }
      return null;
    }
   }

I get an error on the line if (val == list[i]) {:

invalid types 'int[int]' for array subscript

I have two questions: Why is the error happening, and is there some better way to get the index of a value in an array without using complex syntaxes?

Upvotes: 1

Views: 2344

Answers (2)

kingsjester
kingsjester

Reputation: 308

Same answer as the accepted one, but with more recent c++ features :

int index(int val, int *list) 
{
    auto it = std::find(list, list + 8, val);
    if( it == list + 8 )
    {
        return -1; // if no match found
    }
    else
    {
        return distance(list, it);
    }
}

Note: you need to return an integer value instead of null, since the return type of the function is int.

Upvotes: 0

Papai from BEKOAIL
Papai from BEKOAIL

Reputation: 1529

you should accept as an array instead of single-variable in function:

int index(int val, int *list) {
  int i;
  for (i = 0; i < 8; i++) {
    if (val == list[i]) {
      return i;
    }    
  }

  /* if no match found */
    return -1;
}

Note: you need to return an integer value instead of null, since the return type of the function is int.

Upvotes: 3

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