Task 2 :constants and variables

Hi all this is my second task constant and variables...

1.Create and Print a Variable
Concept: A variable is used to store data that can be used later in a program.

name = "Jaya Sri"
print(name)

Explanation:
We create a variable called name and assign a string value to it. The print() function displays the stored value on the screen.

2.Reassign a Variable
Concept: Variables in Python can be updated with new values.

age = 18
print("Old age:", age)

age = 19
print("New age:", age)

Explanation:
Initially, the variable age stores 18. Later, it is reassigned to 19, showing that variables are flexible and can change during execution.

3.Multiple Assignment in One Line
Concept: Python allows assigning multiple variables in a single line.

a, b, c = 5, 10, 15
print(a, b, c)

Explanation:
The values are assigned in order. This makes the code shorter and more readable.

4.Swap Two Variables Without Third Variable
Concept: Python provides a simple way to swap values.

x = 5
y = 10
print("Before swap:", x, y)
x, y = y, x
print("After swap:", x, y)

Explanation:
Instead of using a temporary variable, Python swaps values directly in one line using tuple unpacking.

5.Define a Constant (PI)
Concept: Constants are values that should not change. Python uses uppercase names by convention.

PI = 3.14159
print(PI)

Explanation:
Although Python does not enforce constants, using uppercase letters indicates that the value should remain unchanged.

6.Area of a Circle
Concept: Use a formula with variables and constants.
Formula: Area = π × r²

PI = 3.14159
radius = 5
area = PI * radius ** 2
print("Area of circle:", area)

Explanation:
The radius is squared using ** 2, and multiplied by PI to calculate the area.

1. Area of Rectangle Concept: Use constants for fixed values. Formula: Area = length × width

LENGTH = 10
WIDTH = 5        
area = LENGTH * WIDTH
print("Area of rectangle:", area)

Explanation:
Both length and width are constants. The area is calculated by multiplying them.

1. Circumference of a Circle Concept: Apply another mathematical formula. Formula: Circumference = 2 × π × r

PI = 3.14159
radius = 5
circumference = 2 * PI * radius
print("Circumference:", circumference)

Explanation:
The formula uses PI and radius to compute the boundary length of the circle.