While Loops in Python Programming

While Loops:

• Executes a block of statements repeatedly until a given condition is satisfied.
• When the condition becomes false, the line immediately after the loop in the program is executed.
• It is useful for scenarios where we don’t know in advance how many times we need to loop.

Basic Syntax:

while condition:
    # Code to execute

Example:

count = 0

while count < 5:
    print("Count is:", count)
    count += 1

Output:
Count is: 0
Count is: 1
Count is: 2
Count is: 3
Count is: 4

Infinite Loops:

• Be cautious with while loops, as they can lead to infinite loops if the condition never becomes False as in the below example

count = 0

while count < 5:
    print("Count is:", count)

Output:
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
Count is: 0
....................
....................

Break and Continue Statements:

• break: Exits the loop immediately.
• continue: Skips the rest of the current iteration and proceeds with the next iteration of the loop.

count = 0
while count < 10:
    if count == 5:
        break  # Exit the loop
    print(count)
    count += 1

Output:
0
1
2
3
4

count = 0
while count < 10:
    count += 1
    if count % 2 == 0:
        continue  # Skip even numbers
    print(count)

Output:
1
3
5
7
9
....................
....................