Variables In C

Variables:

A variable is just a named area of storage that can hold a single value (numeric or character).
The C language demands that you declare the name of each variable that you are going to use
along with its type!

How am I supposed to declare a variable?

The tutorial below will help you in understanding this concept. So, open gedit/notepad/notepad++,

write the given program, save it as a .c file, compile, and run.




Example:

#include
int main()
{
int a; /* Declaration */
a = 5; /* Initialization */
/* Printing using printf */
printf(“Wow! CS102 is so much interesting, and I have %d courses in
my first semester”, a);
return 0;
}

Syntax rules for valid variables:

• A variable must consist of only letters, digits and underscore.
• A variable cannot begin with a digit.
• A C reserved word cannot be used as a variable name.

C reserved Words

Declaration and initialization can be done using single statement.

int a = 5; /* Declaration & Initialization using single statement. Try it */