Question

PYTHON Programming Exercise 2: Create a Simple Cost Calculator Write a program that displays input fields (item name and cost) and calculates and displays the calculated costs. The program should do the following: Provide data entry areas for item name and cost. Calculate and display the subtotal of all items. Adds a sales tax of 6% and calculate and displays the total cost.

Enter the following values into your program.

Mother Board $200. RAM $75. Hard Drive $72. Video Graphics Card $55.

Take a screenshot of your code and its results and paste into the Word document

Answer 1

Here is the python code for the above Question. You may edit it according to your need :

# We create two empty lists, item[] and cost[] to store the item name and their costs respectively.
# The subtotal and grand total variables store the computed total of the item costs before and after added tax.
# The option variable holds the input value when user is asked to continue or end adding items. 'Y' for yes and 'N' for no.
item=[]
cost=[]
subtotal=0
grandtotal=0  
option='Y'
# We try to emulate a do while loop in python as it does not have a do while loop as such.
# The loop continues till the if condition is not true and break statement is encountered.
while True :
   #The append() method appends a value to the end of the list specified. In this this case the item[] and cost[] lists.
   item.append(input("Enter item name :"))
   c=input("Enter item cost :")
   # Since the cost input is a string with a '$' symbol , we need to skip it and store the number part of the input.
   # The .index()method finds the index on the string where the specified character is present.
   # In this case we ought to find the '$' symbol and skip it. Thus we add 1 to the index it was found on.
   # Once the numbers are found they are converted to floating points from string type for arithmetic calculation.
   # The reason for conversion is that the input() function in python excepts input as string type by default.
   # Any spaces after the '$' symbol are automatically skipped while conversion from string to float.
   # Here we convert the costs to float type but not int type as int type truncates the decimal part and costs my contain decimal values.
   cost.append(float(c[c.index('$')+1:]))
   # We ask the user if he/she wants to continue adding items to the list.
   option=input("Do you want to add another item [Y/N]: ")
   # If the input is N (representing no as mentioned above), we break from the loop and exit it.
   if option == 'N':
       break
# Providing a line break for a clean output
print("\n")
# This loop prints the items serially along with their individual costs.
# Loop also calculates subtotal of all the items cumulatively that is subtotal= cost 1 + cost 2 + cost 3......
for i in range(len(item)) :
   print(i+1,item[i],"= $",cost[i],)
   subtotal=subtotal+cost[i]
# The grandtotal represents the total cost on the bill after the tax has been applied.
# The tax is applied on the bare subtotal of all the items' costs .
grandtotal= subtotal+0.06*subtotal

# We finally print the subtotal and grandtotal.
print("Subtotal = $",subtotal,"\n")
print("Grandtotal = $",grandtotal)

CODE SCREENSHOT:

OUTPUT SCREENSHOT :