Holy s... it's hard to match leds to music

Projects Programming
15

The compiler recognizes the array as static / constant and therefore most of it is optimized away and multiple pointers points to the same address in memory. These addresses are compared, not the strings located there.

void setup()
{
  const char* str1 = "foo";
  const char* str2 = "foo";
  const char* str3 = "foobar";

  Serial.begin(9600);
  Serial.print("str1 = ");
  Serial.println((int)str1);
  Serial.print("str2 = ");
  Serial.println((int)str2);
  Serial.print("str3 = ");
  Serial.println((int)str3);
  if (str1 == str2) Serial.println("str1 and str2 are equal"); //Will print
  if (str1 == str3) Serial.println("str1 and str3 are equal"); //Will not print
}

Code is untested but I'm sure that str1 and str2 prints the same addresses, which are compared in the code.