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邏輯非 ！? 取反，如果結(jié)果真 返回假，如果結(jié)果假 返回真

邏輯與 && 兩布爾表達(dá)式結(jié)果同時為True時結(jié)果為True，判斷兩個布爾類型表達(dá)式有一個為False，結(jié)果就為False

邏輯或 || 只要兩個表達(dá)式有一個位True，結(jié)果就為True，兩個表達(dá)式同時為False時返回結(jié)果才為False

（）不會打印3

A Console.Write((int)3.6);浮點(diǎn)型強(qiáng)制轉(zhuǎn)換整形去掉小數(shù)點(diǎn) 結(jié)果3

B Console.Write((double)3.6); 浮點(diǎn)型3.6

C Console.Write((int)3); 整形3

D Console.Write((double)3); 輸出浮點(diǎn)型3

試了試

目前還不會在同一個文件里,創(chuàng)建新的類

不然,就可以

創(chuàng)建 學(xué)生類 class student

包含 (屬性) 姓名和分?jǐn)?shù)? string name;int score;

同時包含 (方法) set姓名和set分?jǐn)?shù) 以及 get姓名和get分?jǐn)?shù)

?????? ?void????setName()

????????void????setScore()

????????string? ? getName()

????????int? ? getName()

創(chuàng)建包含8個學(xué)生的 學(xué)生數(shù)組????student[] ss=new student[8];

給每個學(xué)生 錄入 姓名和分?jǐn)?shù)

????????ss[0].setName("吳松");

????????ss[0].setScore(89);

然后 比較學(xué)生的分?jǐn)?shù)得到最大值和序列號

根據(jù)序列號可以get姓名

記錄,如果以后還記得 嘗試一下

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?projAboveAvg
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????string[]?names?=?new?string[]?{"景珍","林慧洋","成蓉","洪南昌","龍玉民","單江開","田武山","王三明"};
????????????int[]?score?=?new?int[]?{90,65,88,70,46,81,100,68};
????????????int?sum?=?0,avg;
????????????foreach(int?i?in?score){
????????????????sum?+=?i;
????????????}
????????????avg?=?sum?/?score.Length;
????????????Console.Write("平均分是"+?avg?+"，高于平均分的有：");
????????????for(int?i?=?0;i<score.Length;i++){
????????????????if(score[i]?>?avg){
????????????????????Console.Write(names[i]+"?");
????????????????}
????????????}
????????}
????}
}

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?projGetMaxScore
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????string[,]?stu?=?new?string[8,?2]?{?{?"吳松",?"89"},?{?"錢東宇","90"},?{"伏晨","98"?},?{"陳陸","56"?},?{"周蓉","60"?},?{"林日鵬","91"?},{"何昆","93"?},?{"關(guān)欣","85"?}?}?;
??????????//?查找分?jǐn)?shù)最高的同學(xué)
????????????int?maxScore?=?int.MinValue;
????????????string?topStudent?=?"";

????????????//?獲取數(shù)組的行數(shù)和列數(shù)
????????????int?rows?=?stu.GetLength(0);
????????????int?cols?=?stu.GetLength(1);

????????????//?遍歷數(shù)組
????????????for(int?i?=?0;i<rows;i++){
????????????????int?score?=?int.Parse(stu[i,1]);
????????????????if(score?>?maxScore){
????????????????????maxScore?=?score;
????????????????????topStudent?=?stu[i,0];
????????????????}
????????????}

????????????//?輸出分?jǐn)?shù)最高的同學(xué)的姓名和分?jǐn)?shù)
????????????Console.WriteLine($"分?jǐn)?shù)最高的同學(xué)是{topStudent}，分?jǐn)?shù)是{maxScore}");
????}
????}
}

在 C# 中，GetLength 和 Length 是數(shù)組的兩個不同的屬性，用于獲取數(shù)組的長度信息。它們之間的主要區(qū)別在于：

Length 屬性：

示例：

csharpCopy codeint[] arr = new int[] { 1, 2, 3, 4, 5 };int length = arr.Length; // length 的值是 5

Length 是數(shù)組的屬性，用于獲取數(shù)組的總元素個數(shù)。

對于一維數(shù)組，Length 返回的是數(shù)組的總元素個數(shù)。

對于多維數(shù)組，Length 返回的是數(shù)組的總元素個數(shù)，包括所有維度的元素個數(shù)的乘積。

Length 是一個整數(shù)屬性。

GetLength 方法：

示例：

csharpCopy codeint[,] matrix = new int[,] { { 1, 2 }, { 3, 4 }, { 5, 6 } };int rows = matrix.GetLength(0); ? ?// rows 的值是 3int columns = matrix.GetLength(1); // columns 的值是 2

GetLength 是一個方法，用于獲取指定維度上的元素個數(shù)。

GetLength 接受一個參數(shù)，表示維度的索引。

對于一維數(shù)組，可以使用 GetLength(0) 來獲取數(shù)組的長度。

對于多維數(shù)組，可以使用 GetLength(index) 來獲取指定維度的元素個數(shù)。

總的來說，Length 用于獲取整個數(shù)組的元素個數(shù)，而 GetLength 用于獲取指定維度上的元素個數(shù)。

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?Test
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????//聲明整型數(shù)組，保存一組整數(shù)
????????????int[]?num?=?new?int[]?{?3,34,43,2,11,19,30,55,20};
????????????//請完善代碼，判斷數(shù)組中有沒有7的整倍數(shù)
????????????bool?has7?=?false;
????????????foreach(int?x?in?num){
????????????????if(x%7==0){
????????????????????has7?=?true;
????????????????????break;
????????????????}
????????????}
????????????if(has7){
????????????????????Console.Write("有7的整倍數(shù)");
????????????????}
????????????????else{
????????????????????Console.Write("沒有7的整倍數(shù)");
????????????????}
????????}
????}
}

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?Test
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????string[]?t?=new??string[]{"C","Sh","a","rp"};
????????????//遍歷字符串?dāng)?shù)組t
????????????foreach(string?x?in?t)
????????????{
????????????????Console.Write(x);
????????????}
????????}
????}
}

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?Test
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????//聲明整型數(shù)組，保存一組整數(shù)
????????????int[]?num?=?new?int[]?{?3,34,42,2,11,19,30,55,20};
????????????//請完善代碼，循環(huán)打印數(shù)組中的偶數(shù)
????????????for(int?i?=?0;i<num.Length;i++){
????????????????if(num[i]%2==0)
????????????????{
????????????????????Console.Write(num[i]+",");
????????????????}
????????????}

????????}
????}
}

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?Test
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
???????????string[]?names?=?{"關(guān)羽","張飛","趙云","馬超","黃忠"};//請?jiān)谶@里完善代碼
???????????for(int?x=0;x<?names.Length;x++){
???????????????Console.Write(names[x]+",");
???????????}
????????}
????}
}

using System;

using System.Collections.Generic;

using System.Text;

namespace Test

{

? ? class Program

? ? {

? ? ? ? static void Main(string[] args)

? ? ? ? {

? ? ? ? ? ?string[] names = {"關(guān)羽","張飛","趙云","馬超","黃忠"};//請?jiān)谶@里完善代碼

? ? ? ? ? ?for(int x=0;x< names.Length;x++){

? ? ? ? ? ? ? ?Console.Write(names[x]+",");

? ? ? ? ? ?}

? ? ? ? }

? ? }

}

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?Test
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????//聲明“職位”數(shù)組，初始化為："經(jīng)理","項(xiàng)目主管","技術(shù)總監(jiān)","財(cái)務(wù)主管"
????????????string[]?job?=?new?string[4]{"經(jīng)理","項(xiàng)目主管","技術(shù)總監(jiān)","財(cái)務(wù)主管"};
????????????for?(int?i?=?0;?i?<?job.Length?;?i++)
????????????{
????????????????Console.WriteLine(job[i]);//打印職位
????????????}
????????}
????}
}

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?Test
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????int[]?age?=?new?int[4];????????;//聲明并初始化長度為4的整形數(shù)組
????????????//為數(shù)組元素賦值
????????????age[?0]?=?18;
????????????age[1?]?=?20;
????????????age[?2]?=?23;
????????????age[?3]?=?17;
????????????Console.WriteLine("四名同學(xué)的年齡是：{0}、{1}、{2}、{3}",
????????????????age[?0],age[?1],age[?2],age[?3]);
????????}
????}
}

using?System;
using?System.Collections.Generic;
using?System.Text;

namespace?Test
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????int[]?age?=?new?int[4];????????;//聲明并初始化長度為4的整形數(shù)組
????????????//為數(shù)組元素賦值
????????????age[?0]?=?18;
????????????age[1?]?=?20;
????????????age[?2]?=?23;
????????????age[?3]?=?17;
????????????Console.WriteLine("四名同學(xué)的年齡是：{0}、{1}、{2}、{3}",
????????????????age[?0],age[?1],age[?2],age[?3]);
????????}
????}
}

using System;

using System.Collections.Generic;

using System.Text;

namespace Test

{

? ? class Program

? ? {

? ? ? ? static void Main(string[] args)

? ? ? ? {

? ? ? ? ? ? //請完善代碼

? ? ? ? ? ? for(int y=1;y<=7;y++){

? ? ? ? ? ? ? ? for(int x=1;x<=7;x++){

? ? ? ? ? ? ? ? ? ? if(x==y||x+y==8)

? ? ? ? ? ? ? ? ? ? Console.Write("O");

? ? ? ? ? ? ? ? ? ? else{

? ? ? ? ? ? ? ? ? ? ? ? Console.Write(".");

? ? ? ? ? ? ? ? ? ? }

? ? ? ? ? ? ? ? }

? ? ? ? ? ? ? ? Console.WriteLine();

? ? ? ? ? ? }

? ? ? ? }

? ? }

}