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Use of C array

2022-04-22 07:50:00 【Dream back to Datang knock code】

Array

Definition of array :

A collection that can store multiple data of the same type , Once the length of the array is determined, it cannot be changed

Gets the length of the array : Array name .Lenght

Elements of array :

Each value in the array is called an element , Elements are separated by commas

Index of the array :

All elements in the array have subscripts , from 0 Start , The first element is 0, The subscript of the following element is the subscript of the previous element plus 1

Subscript is the required value to get the array element

Be careful :

Array subscripts must not exceed the range of subscripts , If the subscript does not exist in the array , It will report an exception that the array is out of bounds

Declaration of arrays :

<1> The first way to declare an array

An array type [] Array name ={ Elements 1, Elements 2 , ... };

Declare an array and assign a value to it directly

int[] _arr = {12,45,23,-33,21 };

Know the type of array , And know the value of the array

<2> The second way to declare an array

An array type [] Array name = new An array type [ The length of the array ];

Declare an array , Array has 10 Elements , Because there is no assignment , So the default value of the elements in the array is 0;

int[] _arr1 = new int[10];

Know the type of array , And know the array length

Value and assignment of array :

assignment Array name [ Subscript ]= value ;

int[] _arr1 = new int[10]; Is an array _arr1 assignment Assign a value to the array by subscript , The value is also obtained by subscript

_arr[0] = 34;

_arr[1] = 27;

_arr[2] = 23;

Value Array name [ Subscript ];

int _num1 = _arr[0];

int _num2 = _arr[1];

int _num3 = _arr[2];

Code example of using array :

using System;

namespace Chapter 11 use of arrays

{

class Program

{

static void Main( string[] args)

{

// Use of arrays

#region 1. Get the maximum and minimum values of the elements in the integer array , And sum up

int[] _arr1 = { 23,56,12,87,-2,3,-5 };

// Defines the maximum value of the variable, which is used to receive the maximum value in the array , And give the maximum int Minimum value in type

// In this way, as long as there is one greater than the maximum value, it will be assigned to him

int maxNum = int.MinValue; //int.MinValue yes int Minimum value in type

// Defines the minimum value of the variable, which is used to receive the minimum value in the array , And give the minimum value int Maximum in type

// In this way, as long as there is one smaller than the minimum value, it will be assigned to him

int minNum = int.MaxValue; //int.MaxValue yes int Maximum in type

// Definitions and , Used to record elements and add them

int numHe = 0;

// Use foreach Traversal array

foreach (var item in _arr1)

{

// For maximum , Just compare maxNum If the value is large, assign the value to maxNum (maxNum Now it's int Minimum value in type )

if (maxNum<item)

{

maxNum = item;

}