Python if else

 Python Conditional statements (If else)

1)if

Syntax :

if(condition) :

        s1

         

This  is used to execute the mentioned statement s1  if the given condition is true and skip the execution of statement when the condition is false.

Example:

x=int(input())

if(x>0):

     print ("positive")

 Here if the input is greater than zero it will be printed as positive otherwise no output will be shown.

2)else

Syntax :

    

   else :

         S1

Here S1 is the statement that is needed to be executed when if condition fails.

Example:

x=int(input ())

if(x>0):

     print ("positive")

else:

     print ("negative")

In this case all the other numbers which doesn't fall under if condition will be printed as negative.

3)elif(condition):

          This is used in case of multiple  conditions.

Example:

x=int(input ())

if(x>0):

    print ("positive")

elif(x<0):

     print ("negative")

else:

     print ("zero")

Here elif is used when there is a need of providing multiple conditions.

Now let's see few examples for using these conditional statements.

Exercise

1)To find whether the given number is positive or negative.

Solution:

x=int(input("Enter number"))

if(x>0):

   print ("Positive")

elif(x<0):

   print ("Negative")

else:

   print ("zero")

2)To find whether the given number is odd or even.

Solution:

x=int(input ("Enter number"))

if(x%2=0):

   print ("Even")

else:

   print ("Odd")

3) To find the greatest of three numbers

Solution:

a=int(input("Enter first number"))

b=int(input("Enter second number"))

c=int(input ("Enter third number"))

if(a>b)and(a>c):

   print (a)

elif(b>a)and(b>c):

   print(b)

else:

   print (c)

4)To find whether the given number is divisible by 5 and 10

Solution:

n=int(input ("Enter number"))

if(n%10=0):

   print (n,"is divisible by 5 and 10")

else:

   print (n,"is not divisible by 5 and 10")

5)To  print grade for the given total marks

Solution:

Mark=int(input ("Enter marks")

if(Mark>450):

   print ("A")

elif(Mark>400):

   print ("B")

elif(Mark>350):

   print ("C")

elif(Mark>300):

   print ("D")

else:

   print ("Fail")