2 Element Array

Using Arduino Programming Questions
1

HOw can I set up an array with the following key, value pairs.

{123, "Bob"},{345,"Harry"},{234,"Sue"};

I want to be able to read the array, compare the id to a variable and if match display the name . My code attempt so far is:

char myArray[][2] = {
{123,"Bob"},
{345,"Harry"},
{234,"Sue"},

};
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}

void loop() {

 for (int x = 0; x <= 2; x++) {
    int myID = 123;
    if (myID == myArray[x][0]) {
      Serial.println(myArray[x][1]);
    }
  }
}

The theory being that id 123 matches the first array record and displays Bob.

2

You can't have an array of mixed data types. You could have 2 arrays, search one for an id and use its index value to extract the corresponding name from the second array.

3

Try an array of struct.
Or an array of class.

4

What about if I was to make the id data a string by changing the array to store {"123","BoB"} then when doing the comparison change ID from int to string so I end up comparing two strings.

Would that work, and if so how would I declare the setup the array?

5 
char myArray[][2] = {
{"123","Bob"},
{"345","Harry"},
{"234,""Sue"},

};
6

Array of struct would be better:

typedef struct keyAndValue_ {
   int key;
   char value[NAMELENMAX+1];
} keyAndValue_t;

keyAndValue_t myArray[] = {
   {123, "Bob"},
   {345, "Harry"}
};

  for (int x = 0; x <= sizeof(myArray)/sizeof(myArray[0]); x++) {
    if (myID == myArray[x].key) {
      Serial.println(myArray[x].value);
    }
  }
7

Thanks all for the help. westfw, that suggestion worked for what I'm wanting to do. Thanks.

8

Structures are very, very, useful. A lot of multi-dimensional and/or parallel array constructs are hold-overs from languages like Fortran and BASIC that didn't have anything more complicated than arrays...