C#基础 数组
数组，就是相同数据类型的元素按一定顺序排列的集合，就是把有限个类型相同的变量用一个名字命名，然后用编号区分他们的变量的集合，这个名字称为数组名，编号称为下标。
一维数组
数组初始化，创建数组，数组长度为5
int [] array=new int[5];
array[0] = 1;
array[1] = 2;
array[2] = 3;
array[3] = 4;
array[4] = 5;
//将2号索引位置改成7
array[2] = 7;
//想查看3号索引位置是什么值
Console.WriteLine(array[3]);
//把4号索引位置的值赋值给a
int a = array[4];
//将1号索引位置的值变成从控制台输入
array[1] = int.Parse(Console.ReadLine());
Console.ReadLine();
直接赋值的数组
int[] array1 = new int[] {1,2,3,4,5 };
例：存放5个人的人名
string [] name =new string[5];
for (int i = 1; i <= 5; i++)
{
Console.Write("请输入第"+i+"个人的名字：");
name[i-1] = Console.ReadLine();
}
//查看第三个人的姓名
//Console.WriteLine(name[2]);
//将每个人的姓名都打印出来
for (int i = 0; i < 5; i++)
{
Console.WriteLine(name[i]);
}
Console.ReadLine();
例：输入班级人数，输入每个人的分数，求平均分
Console.Write("请输入班级人数：");
int a = int.Parse(Console.ReadLine());
double[] fen = new double[a];
for (int i = 0; i < a; i++)
{
Console.Write("请输入第" + (i + 1) + "个人的分数：");
fen[i] = double.Parse(Console.ReadLine());
}
double sum = 0;
for (int i = 0; i < a; i++)
{
sum += fen[i];
}
Console.WriteLine("平均分是：" + (sum / a));
Console.ReadLine();
二维数组
int [,] shuzu = new int[3,4];
3 表示有3个一维数组
4 表示每一个一维数组有4个元素
//给第一个一维数组的2号索引赋值
shuzu[0, 2] = 3;
//直接赋值
int[,] shuzu1 = new int[,] {
{1,2,3,4},
{2,3,4,5},
{3,4,5,6}
};
例：根据二维数组，打印一个“王”
string [,] wang = new string[,]
{
{" ","■","■","■","■","■",""},
{" "," "," ","■","","",""},
{" "," "," ","■","","",""},
{" "," ","■","■","■","",""},
{" "," "," ","■","","",""},
{" "," "," ","■","","",""},
{"■","■","■","■","■","■","■"},
};
//打印出王
for (int i = 0; i < 7; i++)
{
for (int j = 0; j < 7; j++)
{
Console.Write(wang[i,j]);
}
Console.WriteLine();
}
Console.ReadLine();
例：输入班级人数，存放每个人的语、数、英成绩进入数组，
Console.Write("请输入班级人数：");
int a = int.Parse(Console.ReadLine());
double [,] score = new double [a,3];
for (int i = 0; i < a; i++)
{
Console.Write("请输入第{0}个人的语文成绩：",(i+1));
score[i, 0] = double.Parse(Console.ReadLine());
Console.Write("请输入第{0}个人的数学成绩：", (i + 1));
score[i, 1] = double.Parse(Console.ReadLine());
Console.Write("请输入第{0}个人的英语成绩：", (i + 1));
score[i, 2] = double.Parse(Console.ReadLine());
}
//求每个人的总分
double [] zong = new double[a];
for (int i = 0; i < a; i++)
{
zong[i] = score[i, 0] + score[i, 1] + score[i, 2];
Console.WriteLine("第{0}个人的总分是：{1}",(i+1),zong[i]);
}
//求语文总分 //求数学平均分
double yuzong = 0;
double shuzong = 0;
for (int i = 0; i < a; i++)
{
yuzong += score[i, 0];
shuzong += score[i, 1];
}
Console.WriteLine("语文总分是："+yuzong);
Console.WriteLine("数学平均分是："+shuzong/a);
Console.ReadLine();
多维数组
数组可以具有多个维度。例如：
int[,,] myArray = new int[2,4,2] {{1,2},{3,4},{5,6},{7,8}} , {{9,10},{11,12},{13,14},{15,16}};
冒泡排序
例：从控制台输入班级人数，每个人的年龄放入数组，
将所有人的年龄求总和
冒泡排序，求年龄最大
Console.Write("请输入班级人数：");
int a = int.Parse(Console.ReadLine());
int[] age = new int[a];
//int sum = 0;
for (int i = 0; i < a; i++)
{
Console.Write("请输入第{0}个人的年龄：", (i + 1));
age[i] = int.Parse(Console.ReadLine());
//sum += age[i];
}
//Console.WriteLine("年龄总和是：" + sum);
//冒泡排序
for (int i = 0; i < a; i++)
{
for (int j = i; j < a - 1; j++)
{
if (age[i] < age[j + 1])
{
int zhong = age[i];
age[i] = age[j + 1];
age[j + 1] = zhong;
}
}
}
for (int i = 0; i < a; i++)
{
Console.WriteLine(age[i]);
}
Console.ReadLine();
