C#语言基础——数组
数组
一、一位数组
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;
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 };
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();
}
查看第三个人的名字
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();
例题：1、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)+"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();
2、从控制台输入班级人数，每个人的年龄放入数组，将所有的年龄求总和
Console.Write("输入班级人数：");
int a = int.Parse(Console.ReadLine());
int[] b = new int[a];
for (int i = 0; i < a; i++)
{
Console.Write("输入第" + (i + 1) + "个人的年龄");
b[i] = int.Parse(Console.ReadLine());
}
int sum = 0;
for (int i = 0; i < a; i++)
{
sum += b[i];
}
Console.WriteLine("年龄总和：" + sum);
Console.ReadLine();
二、二维数组
int [,] shuzu =new int [3,4];
3 表示3个一位数组
4 表示每一个一位数组中有4个元素
给第一个一位数组的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 } };
例题：1、根据二维数组，打印一个“王”
string[,] wang = new string[7, 7]
{
{" ","★","★","★","★","★",""},
{" "," "," ","★","","",""},
{" "," "," ","★","","",""},
{" "," ","★","★","★","",""},
{" "," "," ","★","","",""},
{" "," "," ","★","","",""},
{"★","★","★","★","★","★","★"},
};
//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();
2、输入班级人数，存放每个人的语、数、英成绩进入数组，求每个人的总分，求班级语文总分，数学平均分
法一、
Console.Write("输入班级人数：");
int a = int.Parse(Console.ReadLine());
double[,] fen = new double[a, 3];
for (int i = 0; i < a; i++)
{
Console.Write("输入第" + (i + 1) + "个人的语文分数");
fen[i, 0] = double.Parse(Console.ReadLine());
Console.Write("输入第" + (i + 1) + "个人的数学分数");
fen[i, 1] = double.Parse(Console.ReadLine());
Console.Write("输入第" + (i + 1) + "个人的英语分数");
fen[i, 2] = double.Parse(Console.ReadLine());
}
double sum = 0, sum1 = 0, sum2 = 0;
for (int i = 0; i < a; i++)
{
sum = 0;
for (int j = 0; j < 3; j++)
{
sum += fen[i, j];
}
sum1 += fen[i, 0];
sum2 += fen[i, 1];
Console.WriteLine("第" + (i + 1) + "个人的分数总和是" + sum);
}
Console.WriteLine("语文总和是" + sum1);
Console.WriteLine("数学平均分是" + (sum2 / a));
Console.ReadLine();
法二、
Console.Write("输入班级人数：");
int a = int.Parse(Console.ReadLine());
double[,] fen = new double[a, 3];
for (int i = 0; i < a; i++)
{
Console.Write("输入第" + (i + 1) + "个人的语文分数");
fen[i, 0] = double.Parse(Console.ReadLine());
Console.Write("输入第" + (i + 1) + "个人的数学分数");
fen[i, 1] = double.Parse(Console.ReadLine());
Console.Write("输入第" + (i + 1) + "个人的英语分数");
fen[i, 2] = double.Parse(Console.ReadLine());
}
double[] zong = new double[a];
for (int i = 0; i < a; i++)
{
zong[i] = fen[i, 0] + fen[i, 1] + fen[i, 2];
Console.WriteLine("第{0}个人的总分是：{1}", (i + 1), zong[i]);
}
double yuzong = 0, shuzong = 0;
for (int i = 0; i < a; i++)
{
yuzong += fen[i, 0];
shuzong += fen[i, 1];
}
Console.WriteLine("语文总分是：" + yuzong);
Console.WriteLine("数学平均分是：" + (shuzong / a));
Console.ReadLine();
三、冒泡排序
例题：1、从控制台输入班级人数，每个人的年龄放入数组，冒泡排序，求年龄最大。
Console.Write("输入班级人数：");
int a = int.Parse(Console.ReadLine());
int[] b = new int[a];
for (int i = 0; i < a; i++)
{
Console.Write("输入第" + (i + 1) + "个人的年龄");
b[i] = int.Parse(Console.ReadLine());
}
冒泡排序:固定格式，记住，背过
for (int i = 0; i < a; i++)
{
for (int j = i; j < a - 1; j++)
{
if (b[i] < b[j + 1])//从大到小
{
int zhong = b[i];
b[i] = b[j + 1];
b[j + 1] = zhong;
}
}
}
for (int i = 0; i < a; i++)
{
Console.WriteLine(b[i]);
}
Console.ReadLine();
2、从1-100内随机选10个不同的数做一个数组，对10个数排序，从小到大
法一、
int[] ss = new int[10];
Random s = new Random();
for (int i = 0; i < 10; i++)
{
ss[i] = s.Next(1, 100);
for (int j = 0; j < i; j++)
{
if (ss[i] == ss[j])
{
i--;
}
}
}
for (int i = 0; i < 10; i++)
{
Console.WriteLine(ss[i]);
}
Console.WriteLine();
for (int i = 0; i < 10; i++)
{
for (int j = i; j < 9; j++)
{
if (ss[i] > ss[j + 1])//从大到小
{
int zhong = ss[i];
ss[i] = ss[j + 1];
ss[j + 1] = zhong;
}
}
}
for (int i = 0; i < 10; i++)
{
Console.WriteLine(ss[i]);
}
Console.ReadLine();
法二、
int[] ss = new int[10];
Random s = new Random();
for (int i = 0; i < 10; i++)
{
bool b = true;
int a = s.Next(101);
for (int j = 0; j < i; j++)
{
if (a == ss[j])
{
b = false;
i--;
}
}
if (b)
{
ss[i] = a;
}
Console.WriteLine(ss[i]);
}
Console.WriteLine();
for (int i = 0; i < 10; i++)
{
for (int j = i; j < 9; j++)
{
if (ss[i] > ss[j + 1])//从大到小
{
int zhong = ss[i];
ss[i] = ss[j + 1];
ss[j + 1] = zhong;
}
}
}
for (int i = 0; i < 10; i++)
{
Console.WriteLine(ss[i]);
}
Console.ReadLine();
四、抽奖问题
输入每个人的中奖号码，进行滚动显示 //清屏 //随即一个索引 // 根据索引打印 //等待0.1秒
Console.Write("请输入参与人的总数：");
int a = int.Parse(Console.ReadLine ());
string []jiang=new string [a];
for (int i = 0; i < a; i++)
{
Console.Write("请输入第{0}个人的手机号码：",(i+1));
jiang[i] = Console.ReadLine();
}
Console.WriteLine("所有人的手机号码输入完毕。请按回车键！");
Console.ReadLine();
Random ran = new Random();
for (int i = 0; i < 30; i++)
{
Console.Clear();
int aa = ran.Next(a);
Console.WriteLine("中奖号码："+jiang[aa]);
System.Threading.Thread.Sleep(100);//等待100毫秒
}
//作弊！！！！！！
//Console.Clear();
//Console.WriteLine("中奖号码：" + 14351571);
Console.ReadLine();
