Lab Sheet 7: Arrays

1D Array Exercises

Question 1: Basic Array Operations

Create a Java program that:

1. Declares an array of 10 integers

2. Initializes the array with the following values: {12, 5, 23, 8, 17, 9, 31, 4, 11, 19}

3. Prints all elements of the array

4. Calculates and prints the sum of all elements

5. Finds and prints the largest and smallest elements in the array

Question 2: Array Manipulation

Write a Java program that:

1. Creates an array to store 8 double values entered by the user

2. Prints the array in reverse order

3. Calculates and prints the average of the array elements

4. Counts and prints how many elements are above the average

Question 3: Student Marks Processing

Develop a program that:

1. Stores names and marks of 5 students in two separate arrays

2. Finds and displays the name and mark of the student with the highest score

3. Finds and displays the name and mark of the student with the lowest score

4. Calculates and displays the class average

2D Array Exercises

Question 4: Basic Matrix Operations

Create a Java program that:

1. Declares and initializes a 3x3 integer matrix with values: {{4, 9, 2}, {3, 5, 7}, {8, 1, 6}}

2. Prints the matrix in proper matrix format (rows and columns)

3. Calculates and prints the sum of all elements

4. Finds and prints the largest element in the entire matrix

5. Calculates and prints the sum of each row separately

Question 5: Matrix Manipulation

Write a Java program that:

1. Reads a 4x4 integer matrix from user input

2. Prints the matrix

3. Creates and prints the transpose of the matrix (rows become columns and vice versa)

4. Calculates and prints the sum of the main diagonal elements

Question 6: Advanced Matrix Processing

Develop a program that:

1. Reads a 5x4 integer matrix from user input (4 rows of data)

2. Calculates the sum of each column

3. Stores these column sums as the 5th row of the matrix

4. Prints the complete 5x4 matrix (with the sums row)

5. Finds and prints the column with the highest sum

Practical Application Questions

Question 7: Temperature Analysis

Create a program that:

1. Stores daily temperature readings for a week (7 days) in an array

2. Calculates and displays the average weekly temperature

3. Identifies and displays the hottest and coldest days of the week

4. Counts how many days were above the average temperature

Question 8: Inventory Management

Write a program for a store that:

1. Uses a 2D array to store product information (product ID, quantity, price) for 10 products

2. Allows the user to input this information

3. Calculates and displays the total value of each product (quantity × price)

4. Finds and displays the product with the highest total value

5. Calculates and displays the total inventory value