Conditional statements control the flow of programs. There are three types: sequential, selection, and repetition. Selection statements include if, if-else, and if-elif-else. If runs code when a condition is true. If-else runs one code block if true, another if false. If-elif-else checks multiple conditions sequentially. Nested if places an if statement inside another if to check multiple levels of conditions. These statements allow programs to make decisions and branch based on different conditions being true.

1. Conditional
statements

2. control flow
statements
1. Sequential - default mode
2. Selection - used for decisions
and branching
3. Repetition - used for looping,
i.e., repeating a piece of code
multiple times

3. Selection/Decision control statements
The selection statements are also known as Decision control statements or branching
statements.
It allows a program to test several conditions and execute instructions based on which
condition is true.
Some decision control statements are:
if
if-else
If-elif-else
nested if

4. if
It help us to run a particular code, but
only when a certain condition is met or
satisfied. A if only has one condition to
check.

5. Example:- To check eligibility of vote
age = int(input("Enter your age "))
if age >= 18: # use ‘:’ to indicate end of condition.
print("Eligible to vote")

6. if-else
The else statement allows you to
execute a different block of code if the
if condition is False

7. Example:- Program to subtract smaller number from the larger
number and display the difference.
num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))
if num1 > num2:
diff = num1 - num2
else:
diff = num2 - num1
print("The difference of",num1,"and",num2,"is",diff)

8. if-elif-else
The elif statement allows you to check
multiple conditions in sequence, and
execute different code blocks
depending on which condition is true.

9. Example:- Check whether a number is positive,negative, or zero.
number = int(input("Enter a number: ")
if number > 0:
print("Number is positive")
elif number < 0:
print("Number is negative")
else:
print("Number is zero")

10. Nested if
Nested if statements mean an if
statement inside another if statement.

11. Let us code..