What Is INTEGER Data Type?


Angela Bailey

Integer data type is one of the fundamental data types in programming. It is used to store whole numbers without any decimal places. In most programming languages, integers are represented by a fixed number of bits, which determines the range of values they can hold.

Declaring Integer Variables

To declare an integer variable, you need to specify its name and optionally assign an initial value. Here’s an example:

int age;
int score = 100;

You can also declare multiple integer variables in a single line:

int x, y, z;

Operations on Integers

Integers support various mathematical operations such as addition, subtraction, multiplication, and division. Here are some examples:

int a = 10;
int b = 5;

int sum = a + b; // sum = 15
int difference = a - b; // difference = 5
int product = a * b; // product = 50
int quotient = a / b; // quotient = 2

Integer Overflow

One important thing to note about integers is that they have a limited range. For example, if you try to store a value that exceeds the maximum limit of the integer data type, it will result in an overflow.

An overflow occurs when the result of an arithmetic operation exceeds the maximum value that can be stored in the given number of bits. This can lead to unexpected behavior and incorrect results.

Signed vs Unsigned Integers

In some programming languages, integers can be either signed or unsigned. Signed integers can represent both positive and negative numbers, while unsigned integers can only represent non-negative numbers.

The range of values that can be stored in a signed integer is divided equally between positive and negative values. For example, an 8-bit signed integer can store values from -128 to 127.

On the other hand, an unsigned integer uses all bits to represent non-negative values. For example, an 8-bit unsigned integer can store values from 0 to 255.


Integer data type is a fundamental type in programming that allows you to work with whole numbers. Understanding how to declare and perform operations on integers is essential for writing robust and efficient code.

Remember to consider the range of values that an integer data type can hold and handle overflow scenarios accordingly. Additionally, be aware of the differences between signed and unsigned integers in your programming language of choice.

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