Rules for Constructing Variable Names in C
In C, there are a few rules to follow when constructing variable names:
- Variable names must begin with a letter or an underscore (_).
- Variable names can only contain letters, digits, and underscores.
- Variable names are case-sensitive, meaning that ‘
age
‘ and ‘Age
‘ are considered to be different variables. - Variable names cannot be the same as C keywords, such as ‘
int
‘, ‘for
‘, or ‘while
‘. - Variable names should be descriptive, but not too long. It is a good practice to use meaningful and concise names that give a clear indication of the purpose of the variable.
Here are a few examples of valid and invalid variable names in C:
Valid:
- ‘age’
- ‘student_name’
- ‘_private’
Invalid:
- ‘
1st_student
(starts with a digit)’ - ‘
char
‘ (C keyword) - ‘
while
‘ (C keyword)
It’s also a good idea to follow a naming convention when naming variables in C. One common convention is to use lowercase letters and to separate words with underscores. For example, you might use a variable name like ‘student_age
‘ instead of ‘studentAge
‘. This can help to make your code more readable and maintainable.
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