CSC215-Discussion-Fall-2023

Week 4 Practice Problems (Sample Solutions)
[Topic: Arrays && Loops]

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• Problem 1: Create a method that takes in an array and squares each element in the array.
• Pre-problem 2: What will the average method return? No IDE, calculate by hand (or with a calculator) before attempting Problem 2.
• Problem 2: Create a method that takes the array from Problem 1, and calculate the average.

import java.util.Arrays;

// Problem 1 Test Case
int[] array = {7, 1, 4, 9, 18, 72, 36, 65};
squareUp(array);
System.out.println(Arrays.toString(array));
// [49, 1, 16, 81, 324, 5184, 1296, 4225]

// Problem 2 Test Case
System.out.println(average(array));
// Problem 2: 1397

public static void squareUp(int[] array) {
    for(int i = 0; i < array.length; i++) {
        array[i] = array[i] * array[i]; // (int) Math.pow(array[i], 2);
    }
}

public static int average(int[] array) {
    int sum = 0;

    for(int i = 0; i < array.length; i++) {
        sum += array[i];
    }

    return sum / array.length;
}