学ぶ Min, Max, Sum, and Average

C# Arrays

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When working with arrays, you often need to perform basic calculations such as finding the smallest (minimum) or largest (maximum) value, as well as computing the sum and average of all elements. These operations are common in many real-world scenarios: you might want to find the lowest score in a set of test results, determine the highest temperature recorded during the week, or compute the average sales for a store. Understanding how to efficiently perform these calculations on arrays is an essential programming skill.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[] numbers = { 7, 3, 15, 2, 8, 10 };
            int min = numbers[0];
            int max = numbers[0];

            for (int i = 1; i < numbers.Length; i++)
            {
                if (numbers[i] < min)
                {
                    min = numbers[i];
                }
                if (numbers[i] > max)
                {
                    max = numbers[i];
                }
            }

            Console.WriteLine("Minimum value: " + min);
            Console.WriteLine("Maximum value: " + max);
        }
    }
}

To find the minimum and maximum values in an integer array, you start by assuming that the first element is both the smallest and largest. You then loop through the rest of the array, comparing each element to your current min and max. If you find a value smaller than your current min, you update min; if you find a value larger than your current max, you update max. This approach ensures you check every element and always end up with the true minimum and maximum, as shown in the code above.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            double[] prices = { 9.99, 14.50, 7.25, 12.00, 8.75 };
            double sum = 0;

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

            double average = 0;
            if (prices.Length > 0)
            {
                average = sum / prices.Length;
            }

            Console.WriteLine("Sum: " + sum);
            Console.WriteLine("Average: " + average);
        }
    }
}

Definition

Average is the sum of all elements divided by the number of elements.

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セクション 1. 章 12

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セクション 1. 章 12

Min, Max, Sum, and Average

1. What is the initial value you should use when searching for a minimum in an array?

2. How do you calculate the average of an array of numbers?

3. Why is it important to check for empty arrays before performing calculations?