Search value in int array

Projects Programming
1

Hi,

I use some Xbee's and i want to give them a name, by founding index in an address array and using the index to found the name in a name array.

uint16_t myArray[]={0x40B14DFB,0x408DA113,0x407DB114,0x40C18CEC};

For example, if i have the address 0x407DB114 i want to know its index (2)

I found this code but for a char array, i don't know how to make it functionnal for int

Thks

char *myArray[]={"0x40B14DFB","0x408DA113","0x407DB114","0x40C18CEC"};

char *deviceName[] = {"Garage",
                       "Cave",
                       "Garden",
                       "Pool",
                     };


void setup() {
 
  Serial.begin(9600);
  
  Serial.println("Begin: ");

}

void loop() {

 Serial.println(deviceName[getIndexByKey("0x408DA113")]);

  delay(2000); 
}

int getIndexByKey(char *key )
{
  for ( uint8_t i = 0; i < sizeof( myArray ) / sizeof( char * ); i++ )
    if ( !strcmp( key, myArray[i] ) )
      return i;
      
  return -1;
}
2

Hello

strcmp is used to compare char arrays, you want to compare ints so simply use the comparison operator ( == ).

Edit:

Also you make an array of uint16_t but you store 32 bits values in it...

You could use something like this:

uint32_t myArray[]={ 0x40B14DFB, 0x408DA113, 0x407DB114, 0x40C18CEC };
uint16_t myArrayCount = sizeof( myArray ) / sizeof( myArray[0] );

int16_t counter = -1;
while ( ++counter < myArrayCount )
	if ( myArray[ counter ] == 0x407DB114 )
		break;
			
if ( counter == myArrayCount )
	Serial.println( "Value not found in array" );

else
{
	Serial.print( "Found value in array at pos " );
	Serial.println( counter );
}

But, why not use a struct instead ?

3

You should consider learning the basics.

0x407DB114 is a 32 bits long data, so you should use uint32_t instead of uint16_t.

uint32_t myArray[]={0x40B14DFB,0x408DA113,0x407DB114,0x40C18CEC};

And then :

int getIndexByKey(uint32_t key)
{
  for ( uint8_t i = 0; i < sizeof( myArray ) / sizeof( uint32_t ); i++ )
    if ( key == myArray[i] )
      return i;
      
  return -1;
}
4

Thanks Guix an Bricoleau.

Works fine. I'm going to learn the basics now :slight_smile: