pascal variables
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In Pascal, variables are used to store and manipulate data. They are named memory locations that hold values of a specific type. To declare a variable in Pascal, you need to specify its name and type. For example:
var
age: integer;
name: string;
isStudent: boolean;
In the above code, three variables are declared: age
, name
, and isStudent
. The age
variable is of type integer
, which is used to store whole numbers. The name
variable is of type string
, which is used to store text. The isStudent
variable is of type boolean
, which is used to store true or false values.
To assign a value to a variable, you can use the assignment operator :=
. For example:
age := 25;
name := 'John Doe';
isStudent := true;
In the above code, the variable age
is assigned the value 25
, the variable name
is assigned the value 'John Doe'
, and the variable isStudent
is assigned the value true
.
You can also perform operations on variables, such as arithmetic operations or string concatenation. For example:
var
x, y, sum: integer;
firstName, lastName, fullName: string;
x := 5;
y := 10;
sum := x + y;
firstName := 'John';
lastName := 'Doe';
fullName := firstName + ' ' + lastName;
In the above code, the variable sum
is assigned the value of the sum of x
and y
, which is 15
. The variable fullName
is assigned the concatenated string 'John Doe'
.
Remember to initialize variables before using them, as uninitialized variables can contain unpredictable values. You can initialize variables at the time of declaration or later in your code.
That's a basic overview of variables in Pascal. Variables are essential for storing and manipulating data in Pascal programs.