Program to print natural numbers from n to 1.

Algorithm:
Step 1: Start
Step 2: Read a number, num

Step 3: Repeat step  4&5 until num=0 reaches

Step 4: Print num

Step 5: Compute num=num-1

Step 6: Stop

Flowchart:

Program code:

num=int(input('Enter a number '))
while num>0:
    print num
    num=num-1