Python3 if..... else

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Python if .... else Statement


 IF... ELSE STATEMENT :

                 The if... elif.. else statements is used in Python for decision making.

  if statement syntax:

                   if test expression:  
        
                        statement(s)

Flow chart :





Flowchart of if statement in Python programming
    


*  The program evaluates the test expression and execute the statement(s) only if the test expression is true.
*  If the test expression is false, the statements is not executed.


Eg:

         num=25
         if num=24:
            print("The number is divisible by 2,3,6.")
         print(" This will print always.")

output:   This will print always.


IF.... ELSE STATEMENT :

   Syntax::

                         if test expression:
 
                              body of if
                         else:
   
                               body of else


Flow chart :



                                Flowchart of if...else statement in Python Programming


Eg:

          num=4
          if num>0:
               print("Positive number")
          else: 
                print("Negative number")

output:    Positive number


IF...ELIF...ELSE STATEMENT :

    Syntax::

               if test expression:
          
                    body of if
               elif test expression:

                    body of elif
              else: 
    
                    body of else


Flow chart :

              
              Flowchart of if...elif....else in Python programming


Eg:

       num=0
       if num>0:
            print("Positive number")
       elif num==0:
            print("Zero")
      else:
            print("Negative number")

output::    Zero

NESTED IF STATEMENTS :

   We can have a if.. elif..else statements inside another if.. elif... else statements. This is called nesting in computer programming.

  
Eg:
       num=1
       if num>=0:
            if num==0:
                  print("zero")
            else:
                  print("positive number")
       else:
             print("negative number")

output:   positive number

Python program to find the largest element among three numbers:

       a=0;b=-2;c=7
       if a>b & a>c:
           print("The greater number is a ",a)
       elif b>c:
            print("The greater number is b ",b)
       else:
             print("The greater number is c ",c)

output::    The greater number is c 7 

                            (or)

       a=6
       b=8
       c=3
       if (a>b) and (a>c):
            large=a
       elif (b>c):
             large=b
       else:
             large=c
       print("The larger number is : {}".format(large))

output:   The larger number is : 8
  

 

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