Module: (Python) Nested conditional statement. Difficult conditions


Problem

1/14

Nested conditional statement

Theory Click to read/hide

Nested conditional statement

In "if" blocks and "otherwise" may include any other statements, including other nested conditional statements; the word  else refers to the nearest previous if.
 
Example 
if A > 10:
    if A > 100:
        print("You have a lot of money.")
    else:
        print("You have enough money.")
else:
    print("You don't have enough money.")
Bold indicates a conditional statement that is inside another if statement, which is why it is called a nested conditional statement. With nested conditional statements, you can implement multiple choices, not just two.
You can also use a nested operator after the word else.
 
Example 
if A < 10:
    print("You don't have enough money.")
else:
    if A > 100:
  print("You have a lot of money.")
  else:
  print("You have enough money.")
In this case, if after else one more condition needs to be checked, then instead of the if operator, you can use "cascading" branching with the keyword elif (short for else - if).
 
Example
if A < 10:
    print("You don't have enough money.")
elif A > 100:
  print("You have a lot of money.")
else:
  print("You have enough money.")
Pay attention to the indentation in all examples. When using a cascade condition, all if-elif-else keywords are at the same level.
With a large number of checks written using a cascading condition, for example, in the if-elif-elif-... chain, the first true condition is triggered.

Problem

Using a nested conditional statement, write a program that will display the word "YES" if the number entered from the keyboard is between 20 and 40, and the word "NO " otherwise.
Complete the original program with the necessary conditions.

Please note that the program has two else branches - if any of the conditions is not met, the word NO must be displayed on the screen. 

time 1000 ms
memory 256 Mb
Rules for program design and list of errors in automatic problem checking

Teacher commentary

Insert the missing code snippets
Python
1 
n = int(input())
2
3
4 
        print("YES")
5 
    else:
6 
        print("NO")
7 
else:
8 
    print("NO")

     

Program check result

To check the solution of the problem, you need to register or log in!