solved problems 1-11

solution1.py

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+"""ex.1
+Create two variables a and b, and initially set them each to a different number. 
+Write a program that swaps both values."""
+
+def input_variables(a, b):
+    temporary_c = a                #assign the value of a to the temporary variable c
+    a = b                          #assign the value of b to a, now a has b's value
+    b = temporary_c                #now b has a's original value
+    return (a, b)
+
+x = 7
+y = 8
+result = input_variables(x, y)
+print("The swapped values are", result)

solution10.py

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+"""ex.10
+Create a program that prints the last digit of a given integer
+
+Create a program that:
+1) Reads the integer
+2) Prints the last digit
+Warning! Do not use the programming language MAGIC. After you complete the exercise feel free to do so.
+Warning! Don't try to convert the number into string etc.
+Warning! For this problem it's ok after spending some time to look for the solution."""
+
+
+number = int(input("enter any integer: "))
+
+if number in range(0, 9):
+    print (number)
+elif number > 9:
+    while number >9:
+        number = number - 10
+    print (number)
+else:
+    while number <-10:
+        number = number + 10
+        number *= -1    
+        print (number)
+

solution11.py

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+"""
+ex.11
+You have started working and you are wondering how many things you can buy with the money 
+you've earned. A PS4 costs 200$, a Samsung phone 900$, a TV 500$, a game skin 9.99$
+
+Create a program:
+* Notice that you can't but half TV or 1/4 of PS4.
+* Reads how many hours you've worked
+* Reads your hourly income
+* Prints how many items you can buy
+* Output: "I can buy 4 PS4, 1 Samsung, 3 TV, 80 game skin"
+"""
+
+def calculate_income(hours_worked, hourly_pay):
+    money_earned = hours_worked * hourly_pay
+    number_PS4 = money_earned // 200
+    number_phone = money_earned // 900
+    number_TV = money_earned // 500
+    number_gameskin = money_earned // 9.99
+    return number_PS4, number_phone, number_TV, number_gameskin
+
+hours = 40
+pay_per_hour = 100
+ps4, ph, tv, gs = calculate_income(hours, pay_per_hour)
+print(f"I can buy {ps4} PS4, {ph} Samsung phones, {tv}TVs and {gs} game skins")
+

solution12.py

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+"""# ex.12
+You've consumed X amount of Mbps on Wikipedia and Y amount of Mbps on memes. The cost of visiting Wikipedia is 0,10$ per Mb
+and the cost for watching memes is 0,05$ per Mb. If total consumption  is more than 100$ print "Too much consumption".
+If watching meme consumption is greater than reading wikipedia consumption print "WOW MANY MEMES", "SUCH LOL"(in new line).
+
+Create a program that:
+* Reads X(wikipedia Mb consupmtion) and Y(watching meme Mb consumption)
+* Calculates the total consumption
+* If total consumption greater than 100$ print proper message
+* If watching meme consumption  is greater than reading wikipedia articles print proper messages
+
+Warning! For the greater meme consumption you will use one print statement and the output must be in seperate lines
+"""
+
+def calculate_consumption(X_wikipedia, Y_memes, time_in_sec_wiki, time_in_sec_memes):
+    consumption_wiki = (X_wikipedia/0.10) * time_in_sec_wiki
+    consumption_memes = (Y_memes/0.05) * time_in_sec_memes
+    total_consumption = consumption_wiki + consumption_memes
+    if total_consumption > 100:
+        print("Too much consumption")
+    if consumption_memes > consumption_wiki:
+        print("WOW MANY MEMES\nSUCH LOL")
+    return consumption_wiki, consumption_memes, total_consumption
+
+
+
+
+X = 400
+Y = 300
+time_wiki = 60
+time_memes = 50
+wiki, meme, con = calculate_consumption(X, Y, time_wiki, time_memes)
+print(f"The cost of your wikipedia usage is {wiki} and the cost of your memes usage is {meme} your total consumption is {con}")
+
+
+

solution13.py

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+"""# ex.13
+An internet cafe has 2 ways of charging. If the user is a member pays 2$/hour, Else the user pays 5$. Find if someone is a member or not 
+and calculate the price based on how many hours the user spend. If the user is a member the tax is 10% else the tax is 20%.
+
+Create a program that:
+* Reads how many hours the user spend
+* Check if is a member
+* Add the proper tax fee
+* Print the total amount the user has to pay
+* Output: "The user is a member stayed 2 hours for 2$/hour plus the 10% the total amount is 4.4$"
+"""
+
+def calculate_payment (hours_used, membership):
+    if membership == "yes":
+        basic_payment = hours_used * 2      #hours spent * $2 for member
+        total_payment = basic_payment * 1.1 #basic payment + 10% tax for member
+        total_payment = round(total_payment, 2)
+        description = "member"
+        rate = "$2/hour"
+        tax = "10%"
+    else:
+        basic_payment = hours_used * 5      #hours spent * $5 for non-member
+        total_payment = basic_payment * 1.2  #basic payment + 20% tax for non-member
+        total_payment = round(total_payment, 2)
+        description = "non-member"
+        rate = "$5/hour"
+        tax = "20%"
+    return total_payment, description, rate, tax
+
+
+member = "no"
+hours = 10 
+money_owed, desc, hourly_rate, taxes = calculate_payment (hours, member)
+print(f"The user is a {desc} and stayed {hours} hours for {hourly_rate} plus the {taxes} the total amount is {money_owed}")

solution14.py

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+"""# ex.14
+You want to buy something from Amazon. The seller charges different prices for shipping cost based on location.
+ For US it's 5$, for Europe it's 7$, for Canada it's 3$, for other places it's 9$
+
+Create a program that:
+* Reads the cost of the product
+* Reads your location
+* Print the amount of money you have to pay
+* Ouput: "You have to pay 23$, 20$ for the product and 3$ for shipping cost"
+"""
+
+
+def total_cost(item_cost, location):
+    if location == "US":
+        shipping_fee = "$5"
+        total_due = item_cost + 5
+    elif location == "Europe":
+        shipping_fee = "$7"
+        total_due = item_cost + 7
+    elif location == "Canada":
+        shipping_fee = "$3"
+        total_due = item_cost + 3
+    else:
+        shipping_fee = "$9"
+        total_due = item_cost + 9
+    return total_due, shipping_fee
+
+item_costs = 10
+place = "US"
+pay, shipping = total_cost(item_costs, place)
+print(f"You have to pay ${pay}, {item_costs}$ for the product and {shipping} for shipping cost")
+
+
+

solution15.py

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+"""
+# ex.15
+A cell phone company has the following billing policy
+
+|  | Fixed cost 25$  |
+|---------|--------------|
+| Call duration(in seconds)| Charge($/per second)|
+| 1-500 | 0,01 |
+| 501-800 | 0,008 |
+| 801+ | 0,005 |
+
+Create a program that:
+* Reads how many seconds was the calls duration
+* Calculates the monthly bill for the subscriber
+* Prints the total amount
+* Output: "total amount: 48$"
+
+#### Notice that that the charge for the first 500 seconds it's 0,01$ then for the next 501 to 800 seconds
+ it's 0,008 and then it's 0,005$
+ """
+
+def calculate_montly_bill (calls_duration):
+    fixed_cost = 25
+    if calls_duration == 0:
+        bill = fixed_cost
+    elif calls_duration in range(1, 500):
+        bill = (calls_duration * 0.01) + fixed_cost
+    elif calls_duration in range(501, 800):
+        diff1 = calls_duration - 500            #where diff1 represents the next tier 501-800 sec
+        bill = (diff1 * 0.008) + (500 * 0.01) + fixed_cost
+    else:
+        diff2 = calls_duration - 800
+        bill = (diff2 * 0.005) + (300 * 0.008) + (500 * 0.01) + fixed_cost
+    return bill
+
+seconds_duration = 800
+amount = calculate_montly_bill (seconds_duration)
+print(f"Total amount {amount}")
+
+
+
+

solution16.py

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+"""
+# ex.16
+A fast food chain has these meals
+
+| Meal | Price  |
+|---------|--------------|
+| Burger | 5$ |
+| Pizza | 3$ |
+| Hot Dog | 1,5$ |
+
+Create a program that:
+* Reads the meal the customer wants
+* Prints the cost of the meal
+* Input example: "Hot Dog"
+* Output: "Hot Dog 1,50$"
+"""
+
+#Solution using dictionary:
+
+def menu_price(menu_dict, meal_item):
+    if meal_item in menu_dict.keys():
+        return meal_item, menu_dict[meal_item]
+    else:
+        return("This item is not in the menu")
+
+dict_meals = {"Burger": "5$","Pizza": "3$", "Hot Dog": "1.50$"}
+food = "Caterpillar"
+
+cost = menu_price(dict_meals, food)
+print(cost)

solution17.py

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+"""
+# ex.17
+Create a program that:
+* Calculates the sum of 1+2+3+4...+98+99
+* Prints the sum of 1+2+3+4...+98+99
+* Output: "The sum is 4950"
+"""
+
+def sum_of_natural_numbers(last_number):
+    sum = last_number* (1 + last_number) / 2
+    return int(sum)
+
+num = 99
+result = sum_of_natural_numbers(num)
+print(f"The sum is {result}")

solution18.py

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+"""
+# ex.18
+* Calculates the sum of 1+3+5+7...+99+101
+* Prints the sum of 1+3+5+7...+99+101
+* Output: "The sum is 2601"
+"""
+
+def arithmetic_series(first_term, last_term, difference):
+    number_term = (last_term - first_term)/difference + 1
+    sum = (number_term)/2 * (first_term + last_term)
+    return int(sum)
+
+a = 1
+an = 101
+d = 2
+result = arithmetic_series(a, an, d)
+print(f"The sum is {result}")

solution19.py

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+"""
+# ex.19
+Create a program that reads a number that you want to get the sum until that number
+
+Create a program that:
+* Reads the number you want to sum
+* Calculates the sum of 1+2+3+4...+98+99+n
+* Prints the sum of 1+2+3+4...+98+99+n
+* Input example: 100
+* Output: "The sum is 5050"
+
+###### Try the program with a very very big number, [if it takes too long check this 
+out](http://mathcentral.uregina.ca/qq/database/qq.02.06/jo1.html)
+"""
+from timeit import default_timer as timer
+
+start = timer()
+def sum_of_natural_numbers(last_number):
+    sum = last_number* (1 + last_number) / 2
+    return int(sum)
+
+num = 2000000202020202020202020202
+result = sum_of_natural_numbers(num)
+print(f"The sum is {result}")
+stop = timer()
+print(stop-start)
+

solution2.py

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+"""
+# ex.2
+It's the end of the semester and you got your grades from three classes: Geometry, Algebra, and Physics.
+
+Create a program that:
+1) Reads the grades of these 3 classes (Grades range from 0 - 10)
+2) Calculate the average of your grades
+
+* Example: Geometry = 6, Algebra = 7, Physics = 8
+* Output: average_score = 7
+"""
+
+def subjects_dict(dict1):
+    sum1 = sum(dict1.values())
+    average = sum1/3
+    return average
+
+geo = 6
+alg = 7
+phy = 8
+
+dict2 = {"Geometry" : geo, "Algebra" : alg, "Physics" : phy}
+
+result = subjects_dict(dict2)
+print(f"Your scores are Geometry: {geo}, Algebra: {alg}, Physics: {phy}")
+print("Your average score is", result)

solution20.py

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+"""
+# ex.20
+Create a program that reads a number that you want to get the sum until that number and 
+then calculate the averge of these numbers
+
+Create a program that:
+* Reads the number you want to sum
+* Calculates the sum of 1+2+3+4...+98+99+n
+* Calculates the average of the sum 1+2+3+4...+98+99+n
+* Input example: 100
+* Output: "The average is 50.5"
+"""
+
+
+def sum_avg_of_natural_numbers(last_number, n):
+    sum = last_number* (1 + last_number) / 2
+    avg = (sum + n)/2 
+    return int(avg)
+
+num = 99
+x = 100
+result = sum_avg_of_natural_numbers(num, x)
+print(f"The average is {result}")

solution21.py

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+"""
+# ex.21
+Create a program that reads 5 numbers and find the average of these numbers
+
+Create a program that:
+* Reads the 5 numbers you want
+* Calculates the average of these numbers
+* Input example: 4, 6, 1, 4, 9
+* Ouput: "the average is 4.8"
+"""
+
+def list_of_numbers(list1):
+    sum_list1 = sum(list1)
+    length = len(list1)
+    avg = sum_list1/length
+    return int(avg)
+
+list2 = [1, 2, 3, 4, 5]
+average = list_of_numbers(list2)
+print("The average is", average)