Expected unqualified id before numeric constant

Using Arduino Programming Questions
1

expected unqualified id before numeric constant

#include <FastLED.h>

#define num_leds 60
#define pin 6
#define brightness 50
#define sensitivity 5

in last line i'm getting this error

2

You need to post your code.
In code tags.

3

There may be an invisible character in that line, try writing it again (not copy paste it from somewhere)
Otherwise, is it allowed to have a _ in a variable name ?

4

lesept:
There may be an invisible character in that line, try writing it again (not copy paste it from somewhere)
Otherwise, is it allowed to have a _ in a variable name ?

Well that's new for me as well. I have never encountered invisible characters in Arduino IDE.

To the topic creator, share complete code to get proper help.

5

It happens sometimes when you copy / paste a code from another weirly encoded source (such as an Internet website)