solutions-from-ex-17-to-31

projects/m1/017-what-day-of-the-week/python/main.py

@@ -0,0 +1,26 @@
+#import math module
+import math
+
+# ask to user a year
+year = int(input('Type a year: '))
+
+# using the gived formula determinate wich day is the first of the year typed
+first_day = (year + math.floor((year - 1) / 4) - math.floor(year - 1 / 100) + math.floor(year - 1) / 400) % 7
+
+# if statement the convert the number gived by formula to the name of the day and print on screen
+if first_day < 1: 
+    print('Sunday')
+elif first_day < 2:
+    print('Monday')
+elif first_day < 3:
+    print('Tuesday')
+elif first_day < 4:
+    print('Wednesday')
+elif first_day < 5:
+    print('Thursday')
+elif first_day < 6:
+    print('Friday')
+elif first_day < 7:
+    print('Saturday')
+else:
+    print('error')

projects/m1/018-roulette-payouts/python/main.py

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+#import random module
+import random
+
+# use random function to get a number 
+choice = random.choice(range(0,39))
+
+# if statement that print on screen wich is number and the other cases that pay like a roulette
+if choice % 2 == 0 and choice != 37 and choice != 0:
+    print(f'pay {choice}')
+    print('pay black')
+    print('pay even')
+elif choice % 2 != 0 and choice != 37:
+    print(f'pay {choice}')
+    print('pay red')
+    print('pay odd')
+elif choice == 37:
+    print('pay 00')
+    print('pay green')
+elif choice == 0:
+    print(f'pay {choice}')
+    print('pay green')
+
+
+if choice <= 18 and choice > 0:
+    print('pay 1 to 18')
+elif choice > 18 and choice < 37:
+    print('pay 19 to 36')
+
+
+
+

projects/m1/019-average/python/main.py

@@ -0,0 +1,9 @@
+while True:
+    number = int(input('type a number or 0 to end: '))
+    if number == 0:
+        print(result)
+        break  
+    else:
+        new_number = int(input('type a number or 0 to end: '))
+        result = number + new_number
+

projects/m1/020-discount-table/python/main.py

@@ -0,0 +1,6 @@
+import numpy as np
+
+for i in np.arange(4.95,29.95,5):
+    discount = (round(i,2) * 60) / 100
+    discounted_price = round((round(i,2) - (round(i,2) * 60) / 100),2)
+    print(f'The original price was {round(i,2)}, the discount is 60%, equal to {discount} and the new price is {discounted_price }')

projects/m1/021-compute-the-perimeter-of-a-polygon/python/main.py

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+import math
+
+perimeter = 0
+
+
+first_x = input('Enter the first x-coordinate: ')
+first_y = input('Enter the first y-coordinate: ')
+
+FIRST_X = float(first_x)
+FIRST_Y = float(first_y)
+
+
+x = FIRST_X
+y = FIRST_Y
+
+
+while True:
+    next_x = input('Enter the next x-coordinate: ')
+    if next_x == '':
+        distance = math.sqrt((x - FIRST_X)**2 + (y - FIRST_Y)**2)
+        perimeter = perimeter + distance
+        break
+    else:
+        next_y = input('Enter the next y-coordinate: ')
+        next_x = float(next_x)
+        next_y = float(next_y)
+        distance = math.sqrt((next_x - x)**2 + (next_y - y)**2)
+        perimeter = perimeter + distance
+        x = next_x
+        y = next_y
+
+print(f'The perimeter of that polygon is {perimeter}')
+

projects/m1/022-admission-price/python/main.py

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+
+under_3 = 0
+under_13 = 0
+adult = 0
+senior = 0
+under_13_ticket = 14
+adult_ticket = 23
+senior_ticket = 18
+
+while True:
+    user_input = input('insert guest age or a blank line to quit: ')
+    if user_input == '':
+        break
+    if int(user_input) < 3:
+        under_3 += 1 
+    elif  12 >= int(user_input) >= 3:
+        under_13 += 1
+    elif int(user_input) >= 65:
+        senior += 1
+    else:
+        adult += 1
+
+price_under_13 = int(under_13) * under_13_ticket
+price_adult = int(adult) * adult_ticket
+price_senior = int(senior) * senior_ticket
+total = '%.2f' % (price_under_13 + price_adult + price_senior)
+
+
+if under_3 and under_13 and adult and senior == 0:
+    quit()
+else: 
+    print(f"Your group is composed by {under_3} children equal or under 2 years old , {under_13} equal or under 12 years old, {senior} over 65 and {adult} between 12 and 65. Total amount for tickets is {total} $")
+

projects/m1/023-parity-bits/python/main.py

@@ -0,0 +1,18 @@
+
+total = 0
+
+while True:
+    user_bit = input("Insert a 8 bit sequence or press enter to end: \n")
+    if len(user_bit) == 8:
+        for i in user_bit:
+            i = int(i)
+            total = total + i
+        if total % 2 == 0:
+            print(f"{user_bit} for even parity, parity bit should be 0")
+        else:
+            print(f"{user_bit} for even parity, parity bit should be 1")
+    elif user_bit == '':
+        break
+    else:
+        print('This is not a 8 bit sequence!')
+

projects/m1/024-fizz-buzz/python/main.py

@@ -0,0 +1,11 @@
+
+for i in range(0,101):
+    if i % 3 == 0 and i % 5 != 0:
+        print(f"{i} fizz!")
+    elif i % 3 != 0 and i % 5 == 0:
+        print(f'{i} buzz')
+    elif i % 5 == 0 and i % 5 == 0:
+        print(f"{i} fizz! buzz!")
+    else:
+        print(i)
+

projects/m1/025-caesar-cipher/python/main.py

@@ -0,0 +1,14 @@
+message = input('insert a message to encode or decode: ')
+number = int(input('insert a positive number to encode or negative to decode: '))
+
+ALPHABET = 'abcdefghijklmnopqrstuvwxyz'
+new_message = ''
+
+
+for i in message:
+    for e in ALPHABET:
+        if e == i:
+            index = ALPHABET.index(e) 
+            new_message += ALPHABET[index + number]
+
+print(new_message)

projects/m1/026-is-a-string-a-palindrome/python/main.py

@@ -0,0 +1,14 @@
+USER_INPUT = input('type a word: ')
+
+new_word = ''
+
+for i in reversed(USER_INPUT):
+    new_word += i
+
+if new_word == USER_INPUT:
+    print(f'{USER_INPUT} is a palyndrome')
+else:
+    print(f'{USER_INPUT} isn\'t a palyndrome')
+
+
+

projects/m1/027-the-collatz-conjecture/python/main.py

@@ -0,0 +1,16 @@
+while True:
+    user_input = int(input('type a postive number or a negative number or a 0 to end: '))
+    if user_input <= 0:
+        break
+    else:
+        number = user_input
+        sequence = str(number) 
+        while number != 1:
+            if number % 2 == 0:
+                number = number // 2
+                sequence += ' ' + str(number)
+            else:
+                number = number * 3 + 1
+                sequence += ' ' + str(number)
+        print(sequence)
+

projects/m1/028-prime-factors/python/main.py

@@ -0,0 +1,17 @@
+number = int(input('type a number: '))
+factor = 2
+result = ''
+
+if number < 2:
+    print('number must be grater or, at least, equal to 2')
+    quit()
+
+
+while number >= factor:
+    if number % factor == 0:
+        number = number / factor
+        result += ' ' + str(factor)
+    else:
+        factor += 1
+
+print(result)

projects/m1/029-decimal-to-binary/python/main.py

@@ -0,0 +1,9 @@
+result = ''
+
+q = int(input('Type a number to convert in binary: '))
+
+while q != 0:
+    r = q % 2
+    result += str(r)
+    q = q // 2
+print(f'The binary value of the number is : {result}')

projects/m1/030-maximum-integer/python/main.py

@@ -0,0 +1,17 @@
+import random
+
+high_number = random.choice(range(1,101))
+
+update = 0
+
+for i in range(1,100):
+    number = random.choice(range(1,101))
+    if number > high_number:
+        high_number = number
+        print(f'{number} <== update')
+        update += 1
+    else:    
+        print(number)
+
+print(f'The maximum value found was {high_number} and was updated {update} times ')
+

projects/m1/031-coin-flip-simulation/python/main.py

@@ -0,0 +1,17 @@
+import random
+
+sequence = ''
+average = 0
+
+for i in range(0,10):
+    while sequence.count('TTT') == False and sequence.count('HHH') == False:
+        value = random.randint(0,1)
+        if value == 0:
+            sequence += 'H'
+        else:
+            sequence += 'T'
+    average += len(sequence)
+    print(f'{sequence} ({len(sequence)} flips)')
+    sequence = ''
+
+print(f'On average {average / 10} were needed.')