design a program for the following. Registration workers at a conference for authors of children's book have collected data about conference participants, including the number of book each author has written and the target age of their readers. The participants have written for 1 to 40 books each, and target reader's ages range from 0 through 16. Design a program that continuously accepts the number of books written until a sentinel value is entered, and then display a list of how many participants have written each number of books (1 through 40).
you can probably adapt this little perl ditty to your needs. Other languages may be more verbose, however.
my %authors,%ages,%counts;
while (<>) {
last unless $_;
my ($count,$age,$name) = split(/\s+/,$_,3);
$authors{$name} = [$count,$age];
$ages{$age}++;
$counts{$count}++;
}
foreach my $c (1..40) {
printf "%2d: %3d\n",$c,$counts{$c};
}
can this be written in pseudoode?
To design a program that collects data about conference participants and displays the number of participants who have written each number of books (from 1 to 40), you can follow these steps:
1. Start by creating a list or an array to store the counts of how many participants have written each number of books. Initialize all counts to zero.
2. Set up a loop that continuously accepts the number of books written by each participant until a sentinel value (a specific value that will indicate the end of input) is entered. In this case, the sentinel can be any value that you decide; for example, entering a negative number or a special character like "-1" or "X".
3. Within the loop, prompt the user to enter the number of books written by the participant.
4. Validate the user input to ensure it falls within the range of 1 to 40 (as specified in the problem description). Only accept valid input; otherwise, display an error message and prompt for input again.
5. Once a valid number of books is entered, increment the count of participants who have written that number of books in the respective position of the list or array created in step 1.
6. When the sentinel value is entered (indicating the end of input), exit the loop.
7. After the loop, iterate through the list or array of book counts and display the number of participants who have written each number of books (from 1 to 40). If any count is zero, you can choose to skip displaying it, or indicate that no participants have written that number of books.
Here is a Python code example to help you understand the implementation better:
```python
# Step 1: Initialize count of participants for each number of books
book_counts = [0] * 41 # We use 41 to account for indices from 1 to 40
# Step 2: Continuous input until sentinel value is entered
while True:
# Step 3: Prompt user for number of books
num_of_books = int(input("Enter the number of books written (or sentinel to exit): "))
# Step 4: Validate and handle sentinel value
if num_of_books < 0:
break
elif num_of_books < 1 or num_of_books > 40:
print("Invalid input. Number of books should be between 1 and 40.")
continue
# Step 5: Increment count for valid number of books
book_counts[num_of_books] += 1
# Step 7: Display count of participants for each number of books
for i, count in enumerate(book_counts[1:], start=1):
if count > 0:
print(f"{i} book(s): {count} participant(s)")
```
Note: In this example, the program assumes valid integer input from the user. It also outputs the counts only for those numbers of books where at least one participant has written them. You can modify and extend the code as per your specific requirements and language of choice.