Question

Which of the followings are an acceptable and which of the followings are not an acceptable variable name? In case of unacceptable justify your answer, i.e., why not acceptable?

1. M

2. 1_Name

3. #_Name

4. My Friend

5. name

6. We_Are_All_Friends

Answer 1

M
acceptable 

1_Name
not acceptable
Because names should not starts with number
 
#_Name
not acceptable
Because names should not starts with special characters

My Friend
not acceptable
Because names should not contains space

name
acceptable

We_Are_All_Friends
acceptable