Page 233 - Learn To Program With Scratch

Problems
1. Write a program that asks the user to enter a word and then says that
word N times, where N is the number of letters in the input word.
2. Write a program that asks the user to enter a word. The program then
determines the number of occurrences of the letter a in the input word.
3. Write a program that reads a singular English noun from the user. The
program then produces the plural form of that noun. (Hint: Check
the last letter and the second from the last letter of the input word.) To
keep the program simple, consider only the following rule: If the word
ends in ch, x, or s, add es for the plural, otherwise just add an s.
4. Write a program that reads a single character (between a and z) from
the user and outputs the position of that character in the alphabet
(a = 1, b = 2, c = 3, and so on). Uppercase letters and lowercase letters
should be treated the same. (Hint: Define a variable named alpha that
holds the letters of the alphabet, as we did in Figure 8-9, and then use
a loop to find the position of the input character within the variable
alpha.)
5. Write a program that asks the user to enter a letter of the alphabet and
then displays the letter that precedes the input letter. (Hint: Use the
same technique used in the previous problem.)
6. Write a program that reads a positive integer from the user then finds
and displays the sum of its digits. For example, if the user enters 3582,
the program should display 18 (3 + 5 + 8 + 2).
7. Write a program that reads a word from the user and then displays the
letters in reverse using the say block.
8. Write a program that gets a number from the user and then inserts a
space between each pair of digits. For example, if the input number is
1234, the output string should be 1 2 3 4. (Hint: Construct the output
variable by joining the individual letters from the input number with
white spaces.)
Compare 9. In this problem, you’ll create a game that lets players compare frac-
Fractions .sb2 tions. The user interface is shown on the right. When the New button is
clicked, the game randomly
picks two fractions to com-
pare. The user selects less
than (<), greater than (>), or
equal to (=) by clicking the
oper ator button. When the
user clicks the Check button,
the game checks the answer
and provides feedback. Open
the file CompareFractions.sb2
and add the necessary scripts
to complete the game.

String Processing 211

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