if…elif..else statement

if…elif..else:

Example 1

the marks obtained by a student in 3 subjects are input through the keyboard.

the students get a division as per the following rules:

75-100 distinction, 60--74 first class,50-59:2nd class,40--49:3rd class

#m,p,c=int(input("enter m,p,c marks"))#errr

m,p,c=(int(x) for x in input("enter m,p,c marks:").split())

avg=m+p+c/3;

if avg>=75:

    print("u passed in distinction %= ",avg)

elif avg>=60:

    print("U passed in First class %=",avg)

elif avg>=50:

    print("U passed in 2nd class %=",avg)

elif avg>=40:

    print("U passed in 3rd class %=",avg)

else:

    print("Failed,%=",avg)

output:

enter m,p,c marks:20 10 34

U passed in 3rd class %= 41.333333333333336

>>> 

Definition:

When we want to test multiple conditions and execute statements depending on those conditions. "if..elif..else statement" is useful.

Syntax:

if condition1:

    Statement

elif condition2:

    Statement2

elif conditon3:

   Statement3

….

else

    Default statement.

Based on the condition the corresponding action will be executed.

Explanation: condition 1 is True: statement 1 is executed

Remaining statements are not executed.

If condition 2 is True: only statement 2 is executed

If condition 3 is True: only statement 3 is executed

Ex2:

#Largest of two nos
a=int(input("enter 1st no"))
b=int(input("enter 2nd no"))

#Logic
if a>b:
    print("a is big")
else:
    print("b is big")
"""
output
enter 1st no2
enter 2nd no3
b is big
>>> """

Ex3:

#find the Largest of 3 nos

a=int(input("Enter 1st no"))

b=int(input("enter 2nd no"))

c=int(input("enter 3rd no"))

#Logic

if a>b and a>c:

    print("Big no is a=",a)

elif b>c:

    print("Big no is b=",b)

else:

    print("Big no is c=",c)

"""

Note1:

Enter 1st no 10

enter 2nd no 20

enter 3rd no 30

Note2:

Enter 1st no 40

enter 2nd no 20

enter 3rd no 5

Big no is a= 40

>>>

"""

Related video: https://www.youtube.com/watch?v=VozU5n3ouHM&feature=youtu.be

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