Conditional Logic¶

`if` Statement¶

Syntax¶

if condition:
    Statement...1
    Statement...2
    Statement...n
    

The if keyword
A Condition(that is an expression that evaluates True or False)
A colon
Starting on the next line, an indented block of code(called if clause)

Flowchart¶

# Example-1 
x = 5 
if x > 3:
    print("Smaller")
    print("Inside if")
    
print("Outside if")

Smaller
Inside if
Outside if

# Example-2 
if x < 3: 
    print("Smaller") 
if x > 3: 
    print("Larger") 
print("End")

Larger
End

`else` Statement¶

Syntax¶

if condition:
    Body of if block 
else: 
    Body of else block 
    

The else keyword
A colon
Starting on the next line, an indented block of code(called else clause)

Flowchart¶

a = -10 
if a > 0: 
    print("Positive") 
else: 
    print("Negative")

Negative

a = 10 
if a > 0: 
    print("Positive") 
else: 
    print("Negative")

Positive

a = -3
if a >= 0: 
    print("Positive") 
else: 
    print("Negative")

Negative

`elif` Statement¶

Syntax¶

if test expression:
    Body of if
elif test expression:
    Body of elif
else: 
    Body of else

The elif keyword
A Condition(that is an expression that evaluates True or False)
A colon
Starting on the next line, an indented block of code(called elif clause)

Flowchart¶

bmi = 20
if bmi <= 18.5: 
    print("Unhealthy")
elif bmi >= 18.5 and bmi < 24.5: 
    print("Normal")
elif bmi >= 24.5 and  bmi < 30: 
    print("Healthy") 
else: 
    print("Obese")

Obese

# Even or Odd 
A = int(input("Enter a number: "))

if A % 2 == 0: 
    print("Even")
else: 
    print("Odd")

Enter a number: 10
Even

20 % 2 

11 % 2 

25 % 2 

Algorithmic Thinking Introduction to NumPy