The Joy of Computing using Python: Programming Assignment 1,2 & 3

1. Given an integer number n, you have to print the factorial of this number. To know about factorial please click on this link.

Input Format:

A number n.

Output Format:

Print the factorial of n.

Example:
Input:
4

Output:
24

Code:

num = int(input())
factorial=1
if num < 0:
   print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
   print("The factorial of 0 is 1")
else:
   for i in range(1,num + 1):
       factorial = factorial*i

   print(factorial,end='')


2. You are provided with the number of rows (R) and columns (C). Your task is to generate the matrix having R rows and C columns such that all the numbers are in increasing order starting from 1 in row wise manner.

Input Format:
The first line contain two numbers R and C separated by a space.

Output Format:
Print the elements of the matrix with each row in a new line and elements of each row are separated by a space.

NOTE: There should not be any space after the last element of each row and no new line after the last row.

Example:

Input:
3 3

Output:
1 2 3
4 5 6
7 8 9

Explanation: 
Starting from the first row, the numbers are present in the increasing order. Since it's a 3X3 matrix, the numbers are from 1 to 9.

Code:

R, C = map(int, input().split())

print('\n'.join(' '.join(str(C*row + col) for col in range(1, C+1)) for row in range(R)), end='')

3. You all have used the random library of python. You have seen in the screen-cast of how powerful it is.

In this assignment, you will sort a list let's say list_1 of numbers in increasing order using the random library.

Following are the steps to sort the numbers using the random library.

Step 1: Import the randint definition of the random library of python. Check this page if you want some help.

Step 2: Take the elements of the list_1 as input.

Step 3: randomly choose two indexes i and j within the range of the size of list_1.

Step 4: Swap the elements present at the indexes i and j. After doing this, check whether the list_1 is sorted or not.

Step 5: Repeat step 3 and 4 until the array is not sorted.

Input Format:
The first line contains a single number n which signifies the number of elements in the list_1.
From the second line, the elements of the list_1 are given with each number in a new line.

Output Format:
Print the elements of the list_1 in a single line with each element separated by a space. 
NOTE 1: There should not be any space after the last element.

Example:

Input:
4
3
1
2
5

Output:
1 2 3 5

Explanation: 
The first line of the input is 4. Which means that n is 4, or the number of elements in list_1 is 4. The elements of list_1 are 3, 1, 2, 5 in this order.
The sorted version of this list is 1 2 3 5, which is the output.

NOTE 2: There are many ways to sort the elements of a list. The purpose of this assignment is to show the power of randomness, and obviously it's fun.

Code:

n=int(input())

list_1 = []

for i in range(n):

    list_1.append(int (input()))

list_2=[] 

while list_1:

    minimum = list_1[0]

    for x in list_1: 

        if x < minimum:

            minimum = x

    list_2.append(minimum)

    list_1.remove(minimum)    

sarr = [str(a) for a in list_2]

print(' '.join(sarr), end='')