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Contact [7]
3 years ago
7

Write a method called classSplit that accepts a file scanner as input. The data in the file represents a series of names and gra

duation years. You can assume that the graduation years are from 2021 to 2024.Sample input file:Hannah 2021 Cara 2022 Sarah2022Nate 2023 Bob 2022 Josef 2021 Emma 2022Your method should count the number of names per graduation year and print out a report like this --- watch the rounding!:students in class of 2021: 28.57%students in class of 2022: 57.14%students in class of 2023: 14.29%students in class of 2024: 00.00%You must match the output exactly.You may not use any arrays, arrayLists, or other datastructures in solving this problem. You may not use contains(), startsWith(), endsWith(), split() or related functions. Token-based processing, please.There is no return value.
Computers and Technology
1 answer:
Lelu [443]3 years ago
4 0

Answer:

public static void classSplit(Scanner file){

   int studentsOf21 = 0, studentsOf22 = 0,studentsOf23 = 0, studentsOf24 = 0;

   while (file.hasNext() == true){

       String studentName = file.next();

       int year = file.nextInt();

       switch (year){

           case 2021:

               studentsOf21++;

               break;

           case 2022:

               studentsOf22++;

               break;

           case 2023:

               studentsOf23++;

               break;

           case 2024:

               studentsOf24++;

               break;

       }

   }

   int totalGraduate = studentsOf21+studentsOf22+studentsOf23+studentsOf24;

   System.out.printf("students in class of 2021: %.2f%n", students2021*100.0/totalGraduate);

   System.out.printf("students in class of 2022: %.2f%n", students2022*100.0/totalGraduate);

   System.out.printf("students in class of 2023: %.2f%n", students2023*100.0/totalGraduate);  

   System.out.printf("students in class of 2024: %.2f%n", students2024*100.0/totalGraduate);

}

Explanation:

The classSplit method of the java class accepts a scanner object, split the object by iterating over it to get the text (for names of students) and integer numbers (for graduation year). It does not need a return statement to ask it prints out the percentage of graduates from 2021 to 2024.

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Answer:

The program in cpp is given below.

#include <iostream>

using namespace std;

int main()

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   //variables declared to hold sum, count and average of movie ratings

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   int count=0;

   int rating;

   double avg;

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   do{

       std::cout << "Enter the rating (0 to 4): ";

       cin>>rating;

       if(rating>4)

           std::cout << "Invalid rating. Please enter correct rating again." << std::endl;

       if(rating>=0 && rating<=4)

       {

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       }

       if(rating<0)

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   }while(rating>=0);

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   std::cout << "The average rating for the movie is " << avg << std::endl;  

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OUTPUT

Enter the rating (0 to 4): 1

Enter the rating (0 to 4): 2

Enter the rating (0 to 4): 0

Enter the rating (0 to 4): 5

Invalid rating. Please enter correct rating again.

Enter the rating (0 to 4): 1

Enter the rating (0 to 4): -1

The average rating for the movie is 1

Explanation:

1. Variables are declared to hold the rating, count of rating, sum of all ratings and average of all the user entered ratings.

2. The variables for sum and count are initialized to 0.

3. Inside do-while loop, user is prompted to enter the rating for the movie.

4. In case the user enters a rating which is out of range, the user is prompted again to enter a rating anywhere from 0 to 4.

5. The loop executes until a negative number is entered.

6. Inside the loop, the running total sum of all the valid ratings is computed and the count variable is incremented by 1 for each valid rating.

7. Outside the loop, the average is computed by dividing the total rating by count of ratings.

8. The average rating is then displayed to the console.

9. The program is written in cpp due to simplicity since all the code is written inside main().

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