Integer Variable in C++ Programming

Integer Type Variable

In our earlier lesson we have learned about variable and how they are used to store values in computer memory. Now in this lesson we will learn how to declare variable in C++ programming using an Integer Data Type.

Video Explanation

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So the first type of variable we need to know about is of type int - short for integer. This type of variable is used to store a whole number either positive or negative only (example: 10, 89, -24 etc). But if you try to store a fractional value (example: 12.36) in it then it will only store the integer part 12 but not the decimal part 36.

The memory storage capacity of an integer variable is 4 bytes and the range of an int variable is between -2,147,483,648 to 2,147,483,647.

int variable_name;

Here int is used for declaring Integer data type and variable_name is the name of variable (you can use any name of your choice for example: a, b, c, alpha, etc. but remember the Naming Conventions while declaring an integer variable) and ; is used for line terminator (end of line).

Now let's see some examples for more understanding.

signed int x;

int x = 10;

int x, y, z;

int x=42, y=67, z=85;

int x;
x = 18;

int x = 76;
x = 54; // now the new value of x is 54

short int x = 9432;

A short integer variable can store numbers between range -32,768 to 32,767.

unsigned int x = 7645, y = 24861;

An unsigned integer variable can store only positive numbers between range 0 to 4,294,967,295.

long long int x = 9832567;