If else statement

This form of if else statement tests a condition and if the condition evaluates to true than it carries out statements below if otherwise if the condition evaluates to false, it carries out the statements intended below else the syntax of if-else statement is shown below.

          If <conditional expression>:

                Statement

                Statement

          else:

                Statement

                Statement

For example, consider the following code snippet.

         If a>=0:

               Print (a, “is a positive number”)

         else:

                 Print (a, “is a negative number”)

 

Have you seen the above code, having any value more than 0 of variable the above code will print a message like (let’s say 2)

                                                   2 is positive number

for value less than zero (let’s see -5) the above code will print a message like?

                                                  -5 is a negative number

After learning the above discussion, we have understood that unlike to simple if statement, which does nothing when the condition results false, the if else statement perform some action is true or false.

Now let’s have an another example 

If sales >=10,000:

        commission = sales*0.10

else:

        commission = sales*0.05

 

A flow chart for if else statement will help you in better understanding the above discussion

Let’s have a look

Fig: – THE ITERATON CONSTRUCT

 

 Fig: – THE SELECTION CONSTRUCT

So far , you have understand about if else statement in python, I think you can observe the following program code in python.

Here we are writing a python code/program to accept three integers and print the largest of three by making use of only If statement.

Here, we have Please observe the python code.

and here it a flow chart for the same code.

 

Why If else statements in Python

In this tutorial, We have learnt about if  else ststement in python for CBSE class 11 & 12 and its related concepts according to CBSE syllabus. This tutorial is useful for Central Board of secondary education (CBSE) student of class 11^{th &} 12^th, who opted computer science (Code 083) as an optional subject. This topic is also important to start learning python programing language for beginners of class 11th and 12th.

You can check the latest CBSE syllabus for computer science Click here for syllabus OR Click here

UNIT NO.	UNIT NAME	MARKS
1	Computational thinking and programming	40
2	Computer network	10
3	Database management	20
4	Practical	30
5	Total	100

 

Unit II: Computational Thinking and Programming – 1

According to the syllabus, Unit  II  Computational Thinking and Programming – 1 has  the above concepts for learning related to If-Else Statements in Python.

 

 

Exam Time

Chapter : Using Python Libraries

IMPORTANT QUESTIONS : Asked in examinations of Class 12th Computer Science

Important questions