Lecture 5:- Learning Loops

Learning loops is an important step in programming. Loops allow you to repeat a certain block of code multiple times, which is essential for automating tasks, processing data, and solving various programming problems. There are primarily two types of loops: for loops and while loops. Let's explore both of these loop types.

For Loops:

A for loop is used to iterate over a sequence of values a specified number of times. It's commonly used when you know the number of iterations beforehand.

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for variable in range(start, stop, step): # Code to be executed in each iteration

In this loop structure:

start is the starting value of the iteration (inclusive).

stop is the stopping value of the iteration (exclusive).

step is the increment value between iterations (optional).

Example in Python:

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for i in range(1, 6): print(i)

This loop will print the numbers from 1 to 5.

While Loops:

A while loop is used when you want to keep repeating a block of code as long as a certain condition is true.

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while condition: # Code to be executed in each iteration

Example in Python:

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count = 1 while count <= 5: print(count) count += 1

This loop will print the numbers from 1 to 5, just like the previous for loop.

Loop Control Statements:

break: Terminates the loop prematurely.

continue: Skips the rest of the current iteration and moves to the next one.

pass: Used as a placeholder when no action is required in a loop.

Example of break and continue in Python:

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for i in range(1, 11): if i == 5: break # Exit the loop when i is 5 if i % 2 == 0: continue # Skip even numbers print(i)

This loop will print odd numbers from 1 to 3 because it breaks when i is 5 and skips even numbers.

Nested Loops:

Loops can also be nested inside each other to perform more complex tasks.

Example of nested loops in Python:

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for i in range(1, 4): for j in range(1, 4): print(i, j)

This nested loop will print all combinations of i and j from 1 to 3.

Practice using loops by solving programming exercises or challenges. This will help you become more comfortable with their syntax and usage.