What Is Int Data Type in C?


Scott Campbell

What Is Int Data Type in C?

The int data type is one of the most commonly used data types in the C programming language. It is used to store integer values, which are whole numbers without any decimal points or fractional parts.

Declaring an int Variable

In C, to declare a variable of type int, you need to specify the variable name followed by the keyword int. For example:

int age;

This declares a variable named age of type int.

Initializing an int Variable

An int variable can be initialized at the time of declaration. For example:

int score = 100;

This declares and initializes a variable named score with the value 100.

Range of Values

The range of values that can be stored in an int variable depends on the size of an integer on your system. In most systems, an int is represented using 32 bits or 4 bytes, allowing it to store values from approximately -2 billion to +2 billion.

Signed vs. Unsigned Integers

In C, an int is considered a signed integer by default. This means that it can store both positive and negative values. However, if you only need to store non-negative values, you can use the unsigned modifier.

unsigned int count = 10;

This declares and initializes an unsigned int variable named count.

Performing Arithmetic Operations

The int data type can be used to perform various arithmetic operations such as addition, subtraction, multiplication, and division. For example:

int a = 10;
int b = 5;
int sum = a + b;

This calculates the sum of a and b and stores it in the variable sum.

Formatting Output

When printing values of int variables, you can use the %d format specifier in functions like printf(). For example:

int value = 42;
printf("The value is %d", value);

This will print:

The value is 42


The int data type in C is essential for working with whole numbers. It allows you to store and manipulate integer values efficiently. Understanding how to declare, initialize, and use int variables is fundamental for writing C programs.

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