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Mathematical statistics

Mathematical statistics

Wednesday, October 25, 2023 ⁃ Difficulty: Intermediate

Objective

Create a Java program for generating mathematical statistics. The program should store a total of 1000 decimal numeric values in a data array and provide a menu with various user-selectable options. It will run until the user selects the exit option. The program menu should include the following options (1-5):

Add
View
Search
Statistics
Exit

Functionalities:

Add: In this option, users can add new values to the data array. Ensure not to exceed 1000 values.
View: The "View" option displays the list of values in a single line. There may be no values yet.
Search: To search for values, the program will request a real number from the user and determine its existence in the program. There may be no values yet.
Statistics: In this option, the program provides the user with a summary of statistics for the values in the data array, including:

The total stored values.
Total sum of values.
Arithmetic mean.
Maximum and minimum values.

Exit: To terminate the program.

Input

1. Add
2. Show
3. Search
4. Statistics
5. Exit
Enter a option (1-5): 1
7

1. Add
2. Show
3. Search
4. Statistics
5. Exit
Enter a option (1-5): 2

1. Add
2. Show
3. Search
4. Statistics
5. Exit
Enter a option (1-5): 3
6

1. Add
2. Show
3. Search
4. Statistics
5. Exit
Enter a option (1-5): 4

1. Add
2. Show
3. Search
4. Statistics
5. Exit
Enter a option (1-5): 5

Output

7
Not found
Total data: 1
Sum: 7
Average: 7
Min value: 7 
Max value: 7

Solution

Statistics.java

import java.util.Scanner;

public class Statistics {
    public static void main(String[] args) {
        int total = 1000;
        float[] numbers = new float[total];
        int counter = 0;

        float max_value = Float.MIN_VALUE;
        float min_value = Float.MAX_VALUE;
        float total_values = 0.0f;

        int choice;

        Scanner scanner = new Scanner(System.in);

        do {
            System.out.println("1. Add");
            System.out.println("2. View");
            System.out.println("3. Search");
            System.out.println("4. Statistics");
            System.out.println("5. Exit");

            System.out.println();
            System.out.print("Enter an option (1-5): ");
            choice = scanner.nextInt();

            switch (choice) {
                case 1: // Add
                    if (counter < total) {
                        System.out.print("Enter a value: ");
                        numbers[counter] = scanner.nextFloat();

                        if (max_value < numbers[counter]) {
                            max_value = numbers[counter];
                        }

                        if (min_value > numbers[counter]) {
                            min_value = numbers[counter];
                        }

                        total_values += numbers[counter];
                        counter++;
                    } else {
                        System.out.println("The database is full");
                    }
                    break;

                case 2: // View
                    if (counter > 0) {
                        for (int i = 0; i < counter; i++) {
                            System.out.print(numbers[i] + " ");
                        }
                        System.out.println();
                    } else {
                        System.out.println("Data not available");
                    }
                    break;

                case 3: // Search
                    if (counter > 0) {
                        System.out.print("Enter a value to search: ");
                        float search_number = scanner.nextFloat();

                        boolean found_number = false;
                        for (int i = 0; i < counter; i++) {
                            if (numbers[i] == search_number) {
                                found_number = true;
                                break;
                            }
                        }

                        if (found_number) {
                            System.out.println("Number " + search_number + " found");
                        } else {
                            System.out.println("Number not found");
                        }
                    } else {
                        System.out.println("Data not available");
                    }
                    break;

                case 4: // Statistics
                    if (counter > 0) {
                        System.out.println("Total data: " + counter);
                        System.out.println("Sum: " + total_values);
                        System.out.println("Mean: " + (total_values / counter));
                        System.out.println("Minimum value: " + min_value);
                        System.out.println("Maximum value: " + max_value);
                    } else {
                        System.out.println("Data not available");
                    }
                    break;

                default:
                    System.out.println("Valid options (1-5)");
                    break;
            }
        } while (choice != 5);

        scanner.close();
    }
}

import java.util.Scanner; public class Statistics { public static void main(String[] args) { int total = 1000; float[] numbers = new float[total]; int counter = 0; float max_value = Float.MIN_VALUE; float min_value = Float.MAX_VALUE; float total_values = 0.0f; int choice; Scanner scanner = new Scanner(System.in); do { System.out.println("1. Add"); System.out.println("2. View"); System.out.println("3. Search"); System.out.println("4. Statistics"); System.out.println("5. Exit"); System.out.println(); System.out.print("Enter an option (1-5): "); choice = scanner.nextInt(); switch (choice) { case 1: // Add if (counter < total) { System.out.print("Enter a value: "); numbers[counter] = scanner.nextFloat(); if (max_value < numbers[counter]) { max_value = numbers[counter]; } if (min_value > numbers[counter]) { min_value = numbers[counter]; } total_values += numbers[counter]; counter++; } else { System.out.println("The database is full"); } break; case 2: // View if (counter > 0) { for (int i = 0; i < counter; i++) { System.out.print(numbers[i] + " "); } System.out.println(); } else { System.out.println("Data not available"); } break; case 3: // Search if (counter > 0) { System.out.print("Enter a value to search: "); float search_number = scanner.nextFloat(); boolean found_number = false; for (int i = 0; i < counter; i++) { if (numbers[i] == search_number) { found_number = true; break; } } if (found_number) { System.out.println("Number " + search_number + " found"); } else { System.out.println("Number not found"); } } else { System.out.println("Data not available"); } break; case 4: // Statistics if (counter > 0) { System.out.println("Total data: " + counter); System.out.println("Sum: " + total_values); System.out.println("Mean: " + (total_values / counter)); System.out.println("Minimum value: " + min_value); System.out.println("Maximum value: " + max_value); } else { System.out.println("Data not available"); } break; default: System.out.println("Valid options (1-5)"); break; } } while (choice != 5); scanner.close(); } }

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