Thread: Is value in array?

You can't do sizeof on an array once you've passed it to a function.
Or rather, it stops telling you what you want to know.

Code:

unsigned long TEAM_RED[] = {151188, 22222, 33333};
int valueinarray(unsigned long val, unsigned long arr[], size_t len);
unsigned long abc = 33333;
void setup() {
  Serial.begin(115200);
  Serial.println("Ready");
  if (valueinarray(abc, TEAM_RED, sizeof(TEAM_RED) / sizeof(TEAM_RED[0]) )) {
    Serial.println("ZHODUJE SA");
  } else {
    Serial.println("NIE");
  }
}
 
void loop() {
 
 
}
int valueinarray(unsigned long val, unsigned long arr[], size_t len)
{
  int i;
  for (i = 0; i < len; i++)
  {
    if (arr[i] == val)
      return 1;
  }
  return 0;
}

That Stack Overflow solution is wrong: it tries to compute the size with sizeof, but it's invoking sizeof on a pointer instead of an array.

Just have a third parameter that is the number of elements in the array.