Rules for Naming a Variable in C

Here are the rules that we must follow when naming it:
1. The name of the variable must not begin with a digit.
2. A variable name can consist of digits, alphabets, and even special symbols such as an underscore ( _ ).
3. A variable name must not have any keywords, for instance, float, int, etc.
4. There must be no spaces or blanks in the variable name.
5. The C language treats lowercase and uppercase very differently, as it is case sensitive. Usually, we keep the name of the variable in the lower case.
Let us look at some of the examples,
int var1; // it is correct
int 1var; // it is incorrect – the name of the variable should not start using a number
int my_var1; // it is correct
int my$var // it is incorrect – no special characters should be in the name of the variable
char else; // there must be no keywords in the name of the variable
int my var; // it is incorrect – there must be no spaces in the name of the variable
int COUNT; // it is a new variable
int Count; // it is a new variable
int count; // it is a valid variable name