If Statement
It is a selection statement, and a block
    of code is executed if the given condition is true.
Syntax:
if (condition):
Code to be executed
Program:
       if(9<10):
  
  
         print("true")
  
Output:
   true
  Elif Statement
  "Try this condition if the previous conditions were false" is the command
    that Python uses with the elif keyword.
Syntax:
if(condition):
  code to be executed
elif(condition):
  code to be executed
Program:
   a=10
     b=9
  
       if(a<b):
  
  
         print("true")
  
  
       elif(a>b):
  
  
         print("false")
  
Output:
   false
  Else Statement
A block of code to be executed can be
    specified with the else statement. when the condition is not true.
Syntax:
If(condition):
Code to be executed
else:
Code to be executed
Code to be executed
else:
Code to be executed
Program:
       subject1=int(input("Enter subject1 mark:"))
  
  
       subject2=int(input("Enter subject2 mark:"))
  
     total=subject1+subject2
     percentage=total/2
  
       if(percentage >90):
  
  
         print("Good mark")
  
     else:
  
         print("better luck next time")
  
Output:
   Enter subject1 mark:80
     Enter subject2 mark:75
     better luck next time
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