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Challenge 4.4

Count dots on 5 black and white cards as one input (using a loop)

Challenge Level: Growing experience

Requirement:

Write a program that asks the end user to enter 5 black and white cards representing bits, all as one input ('B' for black and 'W' for white), and displays the total number of dots as the output. Use a loop for this challenge, so it could be changed to work for a different number of cards.

Hints
  • Make variables called:

    • “total number of dots” and set its value to 0.
    • “number of dots” and set its value to 16.
    • “cards” and set its value to the string entered as the input. Check each letter of the input string “cards” (use a loop to iterate 5 times) starting from the first letter. If it’s ‘W’ add the corresponding number of dots (16 for the first letter, 8 for the second letter and so on) to the “total number of dots”. Display the “total number of dots” as the output.
    • “index” and set its value to 1. Use this variable to access a letter at the “index” position in the string.
  • You can access a letter at the specified position in a string by using the 'Letter of' block under “Operators”.

  • In this challenge you need to access all the 5 letters in user’s input and check to see if each of them is equal to B (black) or W (white).

Programming Reminders

Output statements

Output a string directly
Blocks showing how to output a string
Output a variable
Blocks showing how to output a variable

Variables

Set a variable as a string
Blocks showing how to set a variable as a string
Set a variable as an integer
Blocks showing how to set a variable as an integer
Set a variable from a calculation
Blocks showing how to set a variable from a calculation
Set a variable from a user input (text)
Blocks showing how to set a variable from a user input (text)
Set a variable from a user input (number)
Blocks showing how to set a variable from a user input (number)
Add one to a value
Blocks showing how to add one to a value

Conditionals

Find out the discount on fruit
Blocks showing how to use conditional blocks

Loops

Output string 10 times
Blocks showing how to output a string
Output number until number reaches 10
Blocks showing how to output a string
Recommended Blocks
Number block
String block
Ask and wait for text block
Say block
Add block
Divide block
Equality block
Letter of string block
Set variable to block
Change variable by block
Custom variable block
Repeat block
If block

Create your program in the editor below

Your submission results will be displayed here

Input Expected output Received output Status
BBBBW
1

                
Not yet run ?
BBBBB
0

                
Not yet run ?
WWWWW
31

                
Not yet run ?