Variable Declaration in C With Example -

In this tutorial, you will learn the variable declaration in C language. A variable is an identifier or a name that is used to refer to a value and this value varies or changes during the program execution. A variable is written with a combination of letters, numbers, and special characters or underscores with the first letter being an alphabet. A maximum of 31 letters can be used to write a variable.

Example:-

x, fact, c22, total_values etc.

Also read, Constant in C with example

Consider the below points while variable declaration in C language

• Uppercase and lowercase alphabets are taken differently. For example, the variables ‘SUM’ and ‘sum’ are pointing to different values.
• No special characters other than underscore(_) are permitted.
• Some C compilers will not accept more than 8 characters. So it is better to declare a variable with a few letters that make it easy to use.
• All the variables used in the C program are declared with the appropriate data types before assigning a value to that variable. For eg:- int intNum = 3;
• reserved words can not be used as variables.

Lets us take an example below

#include <stdio.h> 
int main() 
{ 
// Create variables 
int intNum = 3; // Integer (whole number) 
float floatNum = 3.99; // Floating point number 
char letter = 'C'; // Character 
// Print variables 
printf("%d\n", intNum); 
printf("%f\n", floatNum); 
printf("%c\n", letter); 
return 0; 
}

Output:-

Conclusion:- I hope this tutorial will help you to understand the overview of variable declaration. If there is any doubt then please leave a comment below.

Originally published at https://pbphpsolutions.com on June 5, 2022.