Page 498 - ComputerScience_Class_11

Program 6: Write a program to find the factorial of a number entered by user.

Program 6.py
File Edit Format Run Options Window Help

n = int(input('Enter any number: '))
f = 1
for i in range(1, n+1):
f = f * i
print('The factorial of', n, 'is:', f)

Output

Enter any number: 5
The factorial of 5 is: 120

The range() Function
The range() function in Python is a built-in function that is commonly used with loops to generate a sequence of
numbers. It is often used in for loops to specify the number of iterations. Understanding how range() works is important
for controlling the flow of loops in Python.
This function generates a sequence of numbers, starting from a specified number and ending before a specified limit.
This sequence is useful when you want to repeat a task a certain number of times or iterate over a series of numbers.
Syntax:

range(start, stop, step)
where:
• start (optional): The number to start the sequence from. If not provided, it defaults to 0.

• stop (required): The number where the sequence stops, but the stop value is not included in the sequence.
• step (optional): The difference between each number in the sequence. If not provided, it defaults to 1.
Program 7: Write a program to generate the number pyramid as shown below:
1
1 2
1 2 3
1 2 3 4

1 2 3 4 5
Program 7.py

File Edit Format Run Options Window Help

rows = 5
for i in range(1, rows + 1):
print(" " * (rows - i), end="")
for j in range(1, i + 1):
print(j, end=" ")
print()

496 Touchpad Computer Science (Ver. 3.0)-XI