rule for naming variable
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C Programming Constants and Variables
In this tutorial, you will learn about variables, rules for naming a variable, constants and different type of constants in C programming.

Variables
In programming, a variable is a container (storage area) to hold data.
To indicate the storage area, each variable should be given a unique name (identifier). Variable names are just the symbolic representation of a memory location. For example:
int playerScore = 95;
Here, playerScore is a variable of integer type. The variable is assigned value: 95.
The value of a variable can be changed, hence the name 'variable'.
In C programming, you have to declare a variable before you can use it.
Rules for naming a variable in C
A variable name can have letters (both uppercase and lowercase letters), digits and underscore only.
The first letter of a variable should be either a letter or an underscore. However, it is discouraged to start variable name with an underscore. It is because variable name that starts with an underscore can conflict with system name and may cause error.
There is no rule on how long a variable can be. However, only the first 31 characters of a variable are checked by the compiler. So, the first 31 letters of two variables in a program should be different.
C is a strongly typed language. What this means it that, the type of a variable cannot be changed.
TUTORIAL
search
C Programming Constants and Variables
In this tutorial, you will learn about variables, rules for naming a variable, constants and different type of constants in C programming.

Variables
In programming, a variable is a container (storage area) to hold data.
To indicate the storage area, each variable should be given a unique name (identifier). Variable names are just the symbolic representation of a memory location. For example:
int playerScore = 95;
Here, playerScore is a variable of integer type. The variable is assigned value: 95.
The value of a variable can be changed, hence the name 'variable'.
In C programming, you have to declare a variable before you can use it.
Rules for naming a variable in C
A variable name can have letters (both uppercase and lowercase letters), digits and underscore only.
The first letter of a variable should be either a letter or an underscore. However, it is discouraged to start variable name with an underscore. It is because variable name that starts with an underscore can conflict with system name and may cause error.
There is no rule on how long a variable can be. However, only the first 31 characters of a variable are checked by the compiler. So, the first 31 letters of two variables in a program should be different.
C is a strongly typed language. What this means it that, the type of a variable cannot be changed.
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