Write Java statements to accomplish each of the following tasks: a) Display the value of element 6 of array \(f\) b) Initialize each of the five elements of one-dimensional integer array g to 8 c) Total the 100 elements of floating-point array \(c .\) d) Copy 11 -element array a into the first portion of array b, which contains 34 elements. e) Determine and display the smallest and largest values contained in 99 -element floating point array w.

Short Answer

Expert verified
1. System.out.println(f[5]); 2. for (int i = 0; i < g.length; i++) { g[i] = 8; } 3. float sum = 0; for (int i = 0; i < c.length; i++) { sum += c[i]; } 4. System.arraycopy(a, 0, b, 0, 11); 5. float smallest = w[0], largest = w[0]; for (int i = 1; i < w.length; i++) { if (w[i] < smallest) smallest = w[i]; if (w[i] > largest) largest = w[i]; } System.out.println('Smallest: ' + smallest + ', Largest: ' + largest);

Step by step solution

01

- Display the Value of Element 6

Use the array index to access element 6 of array 'f' and display its value. Remember that array indices start from 0. The Java statement would be: System.out.println(f[5]);
02

- Initialize Elements of Array g

Use a loop to iterate over array 'g' and initialize each element to 8. The Java statement would be: for (int i = 0; i < g.length; i++) { g[i] = 8; }
03

- Total Elements of Array c

Declare a variable to store the sum, and use a loop to add each element of array 'c' to this variable. The Java statements would be: float sum = 0; for (int i = 0; i < c.length; i++) { sum += c[i]; }
04

- Copy Array a into Array b

Use System.arraycopy to copy contents of array 'a' into 'b'. Ensure that the array 'a' has 11 elements and 'b' has at least 34 elements. The Java statement would be: System.arraycopy(a, 0, b, 0, 11);
05

- Determine Smallest and Largest Values

Initialize two variables to hold the smallest and largest values, iterate over array 'w' to find these values, and display them. The Java statements would be: float smallest = w[0]; float largest = w[0]; for (int i = 1; i < w.length; i++) { if (w[i] < smallest) smallest = w[i]; if (w[i] > largest) largest = w[i]; } System.out.println('Smallest: ' + smallest + ', Largest: ' + largest);

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Array Initialization
Before you can use an array in Java, it's important to initialize it. Array initialization involves allocating memory for the array and setting the initial values for all the elements. If you skip this crucial step, your array elements might contain junk data, which can lead to unpredictable results. In our exercise, we've initialized an integer array to the value 8.

Here's what makes initialization vital: once an array is created, each element has a default value—0 for integers and null for object references. But if you want all elements to have a specific value right from the start, you must explicitly set them, like in the exercise where each element of the integer array g is initialized to 8 using a simple loop. By using a for loop that iterates from the first to the last index of the array, you can systematically assign a value to each element.
Array Element Summation
Summing up the elements in an array is a common operation in Java, especially when working with numerical data. In the context of our exercise, totaling the elements of an array is done by iterating over the array and adding up each value.

Creating a running total involves starting from an initial sum of 0, which is then incremented by the value of each array element during a loop. This procedure, known as accumulation, requires careful loop construction to ensure that every element is accounted for and that the bounds of the array are not exceeded. Using a variable like sum is essential to keep track of the aggregated value as you move through each element of the floating-point array c.
Array Copying
To copy an array in Java, or part of it, to another array, you use a method like System.arraycopy(). This built-in method is incredibly efficient for array copying operations and can prevent you from having to write additional looping constructs just to copy elements one at a time.

When copying an array, it's important to ensure that the source and destination arrays are properly sized and that the position indices are correct to avoid ArrayIndexOutOfBoundsException. In our exercise, we copy the first 11 elements of array a into the beginning of array b. The source and destination indices both start at 0, and we specify 11 as the number of elements to copy, aligning perfectly with the available elements in array a and the space in array b.
Array Minimum and Maximum
Determining the smallest and largest values in an array is a fundamental operation. This is often done by iterating through the array and comparing each element against two variables—typically named smallest and largest. Initially, you can set both variables to the value of the first element in the array.

As you loop through each element, if a smaller value is encountered, the smallest variable gets updated. Similarly, if a larger value is found, the largest variable gets updated. This ensures that by the end of the loop, you have the correct minimum and maximum values in the array, which can then be displayed or used for further calculations. Our exercise demonstrates this technique on a 99-element floating-point array w, which requires just one pass through the array to identify both extremities.

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Most popular questions from this chapter

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