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10_functions.py
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10_functions.py
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# Functions
# Function without input parameters without returned output
def say_hello_world():
print("hello world")
say_hello_world()
say_hello_world()
say_hello_world()
# Function with input parameters without returned output
def say_hello_person(personName):
print(f"hello {personName}!")
say_hello_person("Mirtes")
say_hello_person("Hugo")
say_hello_person("Diogo")
# Function with input parameters and with returned output
def is_pair(num):
result = num % 2
if result == 0:
return True
else:
return False
def is_pair(num):
return (num % 2) == 0
print("Is 10 pair", is_pair(10))
print("Is 3 pair =", is_pair(3))
# perimeter = 2 * pi * r
# r -> is a our parameter
# 2, pi -> constants
def circle_perimeter(r):
pi = 3.14
return 2 * pi * r
print("circle_perimeter(10) =", circle_perimeter(10))
# area = pi * r * r
# r -> is a our parameter
# pi -> constants
def circle_area(r):
return 3.14 * r * r
print("circle_area(10) =", circle_area(10))
def calculate_circle_metrics(r):
perimeter = circle_perimeter(r)
area = circle_area(r)
return perimeter, area
# 1! = 1
# 0! = 1
# 2! = 2*1 = 2
# 3! = 3*2*1 = 6
# 4! = 4*3*2*1 = 24
# 1! = 1 (constant)
# 0! = 1 (constant)
# 2 = 3 * 2! (calculated)
# 3 = 3 * 2! (calculated)
# 4! = 4 * 3! (calculated)
# n! = n * (n - 1)! (calculated)
# 1 * 2 * 3 * 4
# 4 * 3 * 2 * 1
# fact(4) = 24
# it 1
# n = 4
# result = 4
# result = result * (n-1)
# result = 4 * 3 = 12
# n-- = 3
# it 2
# n = 3
# result = 12
# result = result * (n-1)
# result = 12 * 2 = 24
# n-- = 2
# it 3
# n = 2
# result = 24
# result = 24 * 1 = 24
# n-- = 1
# it 4
# n = 1
# n > 1 = False -> escape loop
# Iteractive function
def fact(n):
if n == 0 or n == 1:
return 1
else:
result = n
while n > 2:
result = result * (n-1)
n -= 1
return result
print("fact(1) =", fact(1))
print("fact(0) =", fact(0))
print("fact(4) =", fact(4))
# It 0
# n = 4
# result = 1
# result = 4 * 1 = 4
# IT 1
# n = 3
# result = 3 * 4
# n! = n * (n - 1)! (calculated)
def fact(n):
if n == 0 or n == 1:
return 1
else:
result = n * fact(n-1)
return result
# Fact(4) -> 1
# n = 4
# result = 4 * fact(3)
# Fact(3) -> 2
# n = 3
# result = 3 * fact(2)
# Fact(2) -> 3
# n = 2
# result = 2 * fact(1)
# Fact(1) -> 4
# n = 1
# return 1