在数组中找到最大值

Question

As part of school, one of my assignments is to write 10 pieces of code about 10 different search patterns, etc.

For this one, i need to use a linear search to find the highest and lowest value in a defined array, and then display the number of times that value was found.

Heres the code i came up with:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Maxvaluefinder
{
    class Program
    {
        static void Main(string[] args)
        {
            var array = [1, 31, 10, 9, 420, -5, 77, 420, 300, 99]; //Sets up the array
            var maxvalue = 0; //Establishes variables for maximum value and the counter of maximum value.
            var maxvaluecount = 0;

            for (i = 1; i < array.Length; i++)
            {
                if (array[i] > maxvalue)
                {
                    maxvalue = array[i];
                    maxvaluecount = 1;
                }
                if (array[i] == maxvalue)
                {
                     maxvaluecount = maxvaluecount + 1;
                }
            }

            Console.WriteLine("The highest number in this array was" + maxvalue + "which appeared a total of" + maxvaluecount + "times."); // Prints the final outcome.
        }
    }
}

As of now, i am not 100% sure how the "for (i = 1; i < intArray.Length; i++)" part works, and the 'i' bits 'do not exist in current context'

Please help?

Also, somewhat unrelated: how do i test run the code in microsoft visual studio?

Thanks :)

Answer 1

1st question: You need to declare your i inside for loop if you only want to use i inside it. Otherwise you need to declare i before the for loop.

for (var i = 1; i < array.Length; i++)

And this is how you create new int array

var array = new int[] { 1, 31, 10, 9, 420, -5, 77, 420, 300, 99}; 

2nd question: Go to VS, create new console project, paste your code under main function and press F5

Answer 2

You need to declare a variable before you can use it. Try:

for (int i = 1; i < array.Length; i++){...}

A for loop works as follows:

1. You declare a control variable, in this case i , you assign it the starting value 1.
2. The for loop checks at the start of each loop if its end condition is satisfied, in the given case i < array.Length
3. At the end of every loop, the control variable gets updated according to the last part of your syntax i++ , which is equivalent to i = i+1

Also, I am not sure if you knew that, but in C# arrays are zero-based indexed, which means, that the first element in an array has actually the index zero. So you probably want to initialize: int i = 0