The first 5 solutions.

Solutions/ex1.py

@@ -0,0 +1,12 @@
+# Set the values
+a = 10
+b = 20
+
+# Set a to b, and b to a
+a, b = b, a
+
+# The .format replaces all {} respectively with values in the .format
+print("a = {}, b = {}".format(
+    a,  # Replace the first {} with the (new) value of a.
+    b   # Replace the second {} with the (new) value of b.
+))

Solutions/ex10.py

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+# Get the input from the user
+number = int(input("A number: "))
+
+# To get the last number, we divide by ten, round the number down, multiply it by 10 and subtract it from the number variable.
+# The division and rounding down happens in one step using the // operator.
+to_subtract = 10 * (number // 10)
+
+# Now we subtract them to get the last digit
+last_digit = number - to_subtract
+
+# Print it out
+# .format() is explained in previous solutions.
+print("The last digit of {} is: {}".format(number, last_digit))
+
+
+# The easiest way to do it is using substrings, which is where you grab a specific part of a string.
+# Sadly this wasn't allowed in this exercise.
+# If it were, you'd have this as solution:
+
+# number = input("A number: ")  # Notice the int() is gone. We do this to get a string, not an integer.
+# last_digit = number[-1] # We need the last character of number. -1 is a short operator for that, -2 for the second to last character, etc.
+#
+# print("The last digit of {} is: {}".format(number, last_digit))

Solutions/ex2.py

@@ -0,0 +1,18 @@
+# Ask the user for their grades.
+geometry = input("Grade for Geometry: ")
+algebra = input("Grade for Algebra: ")
+physics = input("Grade for Physics: ")
+
+# We need them as numbers, not as strings.
+geometry = int(geometry)
+algebra = int(algebra)
+physics = int(physics)
+
+# Add everything together and divide by 3 to get the average.
+average = (geometry + algebra + physics) / 3
+
+# Another possible solution using a list:
+# grades = [geometry, algebra, physics]
+# average = sum(grades) / len(grades)
+
+print(average)

Solutions/ex3.py

@@ -0,0 +1,17 @@
+# Ask the user for the current value of the BTC, then the percentage of increase/decrease.
+bitcoin_value = input("Value of your bitcoin: ")
+change_percentage = input("Change% of the BTC: ")
+
+# We need them as numbers, not strings.
+bitcoin_value = int(bitcoin_value)
+change_percentage = int(change_percentage)
+
+# Calculate by how much the BTC went up or down.
+change = (change_percentage / 100) * bitcoin_value
+
+# Print the results.
+# The .format is explained in the solution for ex1.
+print("New BTC value: {}, it changed with: {}.".format(
+    bitcoin_value + change,
+    change
+))

Solutions/ex4.py

@@ -0,0 +1,9 @@
+# Get the user input as integers (basically the first two steps from other solutions as one).
+width = int(input("Width: "))
+height = int(input("Height: "))
+
+# Multiply them together to get the area.
+area = width * height
+
+# Print them out
+print("Area is: {}.".format(area))

Solutions/ex5.py

@@ -0,0 +1,19 @@
+# Get everything we need from the users in the appropriate types.
+money = int(input("How much money do you have: "))
+btc = int(input("The value of BTC: "))
+eth = int(input("The value of ETH: "))
+ltc = int(input("The value of LTC: "))
+
+# See how much we can buy of everything.
+# Note the double / to round the division down and keep it an integer.
+amount_btc = money // btc
+amount_eth = money // eth
+amount_ltc = money // ltc
+
+# Let the user know what he can buy and how much.
+# Because there is just one value we need in the string it is overkill to use .format()
+# Instead we use str() to convert the values to a string, so we can append them to the other strings and print them.
+print("You can buy:")
+print("Bitcoins: " + str(amount_btc))
+print("Ethereum: " + str(amount_eth))
+print("Litecoin: " + str(amount_ltc))

Solutions/ex6.py

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+# Get the input from the user in the required types.
+laptop_price = int(input("Price of laptop: "))
+tax = int(input("Tax%: "))
+
+# Add the tax to laptop_price and store it in the laptop_price variable.
+laptop_price = (1 + tax / 100) * laptop_price
+
+# Print it.
+print("Laptop with tax: " + str(laptop_price))

Solutions/ex7.py

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+# Get the input from the user in the required types.
+years_worked = int(input("How many years have you worked: "))
+children = int(input("How many children do you have: "))
+
+# Salary is:
+# 400 minimum wage,
+# 20 for every year worked,
+# 30 for each child the employee has.
+salary = 400 + 20 * years_worked + 30 * children
+
+# Print it.
+# Notice the \t character. That stands for a TAB. It makes everything align pretty nicely.
+print("Your salary:")
+print("Minimum wage:\t\t\t\t400")
+print("Years of experience:\t\t" + str(20 * years_worked))
+print("Support for your children:\t" + str(30 * children))
+print()  # This is for an empty newline
+print("Total:\t\t\t\t\t\t" + str(salary))

Solutions/ex8.py

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+# Get the input from the user in the required types.
+years_worked = int(input("How many years have you worked: "))
+children = int(input("How many children do you have: "))
+miss_a_day = input("Did you miss a day of work (y/n): ")
+
+# Validate and parse miss_a_day
+# For easy comparison, we make everything entered lowercase.
+if miss_a_day.lower() == "y" or miss_a_day.lower() == "yes":
+    miss_a_day = 0
+else:
+    miss_a_day = 100
+
+# Salary is:
+# 400 minimum wage,
+# 20 for every year worked,
+# 30 for each child the employee has,
+# 100 if the employee didn't miss a day of work.
+salary = 400 + 20 * years_worked + 30 * children + miss_a_day
+
+# Print it.
+# Notice the \t character. That stands for a TAB. It makes everything align pretty nicely.
+print("Your salary:")
+print("Minimum wage:\t\t\t\t400")
+print("Years of experience:\t\t" + str(20 * years_worked))
+print("Support for your children:\t" + str(30 * children))
+print("All-days-worked bonus:\t\t" + str(miss_a_day))
+print()  # This is for an empty newline
+print("Total:\t\t\t\t\t\t" + str(salary))

Solutions/ex9.py

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+# Ask the user for their grades.
+geometry = input("Grade for Geometry: ")
+algebra = input("Grade for Algebra: ")
+physics = input("Grade for Physics: ")
+
+# We need them as numbers, not as strings.
+geometry = int(geometry)
+algebra = int(algebra)
+physics = int(physics)
+
+# Add everything together and divide by 3 to get the average.
+average = (geometry + algebra + physics) / 3
+
+# Another possible solution using a list:
+# grades = [geometry, algebra, physics]
+# average = sum(grades) / len(grades)
+
+print("Your average: " + str(average))
+
+# Encourage the student to work harder.
+if average >= 7:
+    print("Good job!")
+elif 4 < average < 7:
+    print("You need to work a little harder.")
+else:
+    print("You need to work a lot harder.")

exercises.md

@@ -60,7 +60,7 @@ Create a program that:
 * Output: "The total price of the laptop is 330$"
 
 # ex.7
-In a company the monthly salary of an employee is calculated by minimum wage 400$ per month, plus 20$ multiply by the employment years, plus 30$ for each employee kid.
+In a company the monthly salary of an employee is calculated by minimum wage 400$ per month, plus 20$ multiplied by employment years, plus 30$ for each employee kid.
 
 Create a program that:
 * Read the employment years