#define macro not in scope when i try to use IR library

Question

My code keeps saying that that Button_8 and the rest of the #define macros are out of scope.

#include <IRLib.h>
#include <Servo.h>
#define MY_PROTOCOL SONY
#define RIGHT_ARROW 0xfd50af //Move several clockwise
#define LEFT_ARROW 0xfd10ef //Move servo counterclockwise
#define SELECT_BUTTON 0xfd906f //Center the servo
#define UP_ARROW 0xfda05f //Increased number of degrees servo 
#define DOWN_ARROW 0xfdb04f //Decrease number of degrees servo moves
#define BUTTON_0 0xfd30cf //Pushing buttons 0-9 moves to fixed positions
#define BUTTON_1 0xfd08f7 // each 20 degrees greater
#define BUTTON_2 0xfd8877
#define BUTTON_3 0xfd48b7
#define BUTTON_4 0xfd28d7
#define BUTTON_5 0xfda857
#define BUTTON_6 0xfd6897
#define BUTTON_7 0xfd18e7
#define BUTTON_8 0xfd9867
#define BUTTON_9 0xfd58a7
IRrecv My_Receiver(11);//Receive on pin 11
IRdecode My_Decoder; 
long Previous;
Servo myservo2;
Servo myservo; 
void setup() 
{
myservo.attach(8); 
myservo2.attach(3);
My_Receiver.enableIRIn();
}
void loop() 
{
 if (My_Receiver.GetResults(&My_Decoder))
{
 My_Decoder.decode();
 if(My_Decoder.decode_type==MY_PROTOCOL) 
 {
 if(My_Decoder.value==0xFFFFFFFF)
 My_Decoder.value= Previous;
 if(My_Decoder.value == Button_9)
 {
 myservo.write(0);
 myservo2.write(180);
 }
 else if(My_Decoder.value == Button_8)
 {
 myservo.write(180);
 myservo2.write(180);
 }
 }
}
}

when i use a switch statement instead of the 4 and 5 if statement like so:

switch(My_Decoder.value) {
 case Button_8: //do something; break;

it works, but i dont know why.

Answer 1

C++ is case-sensitive. Button_8 is different from BUTTON_8.