类、数组03/12
1、输入身份证号，截取生日
Console.Write("请输入身份证号：");
string a = Console.ReadLine();
if (a.Length == 18)
{
string y = a.Substring(6, 4);
string m = a.Substring(10, 2);
string d = a.Substring(12, 2);
Console.WriteLine("你的生日为" + y + "年" + m + "月" + d + "日。");
}
else
{
Console.WriteLine("你输入的有误！");
}
2、判断邮箱格式是否正确1.有且只能有一个@；2.不能以@开头；3.@之后至少有一个.；4.@和.不能靠在一起；5.不能以.结尾。
Console.Write("请输入邮箱：");
string m = Console.ReadLine();
bool a = m.Contains("@");
if (a == true)
{
int b = m.IndexOf("@");
int c = m.LastIndexOf("@");
if (b == c)
{
if (b != 0)
{
string m1 = m.Substring(b); //3.@之后至少有一个.
if (m1.Contains("."))
{
int d = m1.IndexOf(".");
if (d != 1)
{
int e = m1.Length;
int f = m1.LastIndexOf(".");
if (e - 1 != 1)
{
Console.WriteLine("你输入的格式正确");
}
else
{
Console.WriteLine("你输入的格式有误");
}
}
else
{
Console.WriteLine("你输入的格式有误");
}
}
else
{
Console.WriteLine("你输入的格式有误");
}
}
else
{
Console.WriteLine("你输入的格式有误");
}
}
else
{
Console.WriteLine("你输入的格式有误");
}
}
else
{
Console.WriteLine("你输入的格式有误");
}
3、随机数类 Random
Random ran = new Random();//定义一个叫ran的随机数类，并初始化。
double a = ran.Next(10);//随机找10以内的数
Console.WriteLine(a);
随机输入验证码验证码
string s = "abcdefghijklmnopqistuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
Random ran = new Random();
for (; ; )
{
string biao = "";
for (int i = 1; i <= 4; i++)
{
int a = ran.Next(s.Length);
string b = s.Substring(a, 1);
biao = biao + b;
}
Console.WriteLine(biao);
Console.Write("请输入验证码：");
string yan = Console.ReadLine();
if (biao.ToLower() == yan.ToLower())
{
Console.WriteLine("输入正确！");
System.Threading.Thread.Sleep(2000);
break;
}
else
{
Console.Write("你输入的有误.");
System.Threading.Thread.Sleep(2000);
Console.Clear();
}
}
数组
数组：具有相同类型的若干变量按有序的形式组织起来的一种形式。这些按序排列的同类数据元素的集合称为数组。
一维数组
int[] 变量名 = new int [n];//定义一个int型一维数组，有n个数据
例：//第一种定义
int[] shuzu = new int[5];//5代表个数
////索引从0开始
////付值
shuzu[0] = 1;
shuzu[1] = 2;
shuzu[2]=3;
shuzu[3]=4;
shuzu[4]=5;
Console.WriteLine(2); 输出结果为3
//第二种定义方式
int[] shuzu = new int[] { 1, 2, 3, 4, 5 };
Console.WriteLine(shuzu[2]);
二维数组
第一种表示int[,] shuzu = new int[3, 4];
//有3个数组，每一个数组有4个数；3行4列
第二种表示int[,] shuzu = new int[,]{
{1,2,34,5},
{5,4,7,9},
{6,7,5,4},
};
多（三）维数组
int[, ,] shuzu = new int[3, 2, 4];
{
{
{,,,},
{,,,}
},
{
{,,,},
{,,,}
},
{
{,,,},
{,,,}
}
};
1、从控制台输入10个人的年龄放入数组，将十个人的年龄求总和
int[] y=new int[10];
int sum = 0;
for (int i = 0; i < 10;i++ )
{
Console.Write("请输入第"+(i+1)+"个人的年龄：");
y[i]=int.Parse(Console.ReadLine());
sum+=y[i];
}
Console.WriteLine("年龄总合："+sum);
2、输入人名放进数组，输出第5个人的姓名
Console.Write("请输入人数：");
int a = int.Parse(Console.ReadLine());
string[] n=new string[a];
for (int i = 0; i < 5;i++ )
{
Console.Write("请输入第"+(i+1)+"个人的姓名：");
n[i] = Console.ReadLine();
}
Console.WriteLine(4);
3、输入班级人数，根据人数，挨个输入成绩，求平均分
Console.Write("请输入班级人数：");
int a = int.Parse(Console.ReadLine());
int[] fenshu=new int[a];
int sum = 0;
for (int i = 0; i < a;i++ )
{
Console.Write("请输入第"+(i+1)+"个人的分数：");
fenshu[i] = int.Parse(Console.ReadLine());
sum += fenshu[i];
}
Console.WriteLine("平均分为："+sum/a);
4、输入班级人数，将每个人的语文，数学，英语成绩输入二维数组
Console.Write("输入班级人数：");
int a = int.Parse(Console.ReadLine());
double[,] fenshu=new double[a,3];
for (int i = 0; i < a;i++ )
{
for (int j = 0; j < 3;j++ )
{
if(j==0)
{
Console.Write("请输入第"+(i+1)+"个人的语文成绩：");
}
if (j == 1)
{
Console.Write("请输入第" + (i + 1) + "个人的数学成绩：");
}
if (j == 2)
{
Console.Write("请输入第" + (i + 1) + "个人的英语成绩：");
}
fenshu[i, j] = double.Parse(Console.ReadLine());
}
}
5、打印输出一个汉字
string[,] zi = new string[9, 9]
{
{" "," "," "," "," ","■"," "," "," "},
{" "," "," "," ","■"," "," "," "," "},
{" "," "," ","■"," ","■"," "," "," "},
{" "," ","■"," "," "," ","■"," "," "},
{" ","■"," "," "," ","■"," ","■"," "},
{"■"," "," ","■"," ","■"," "," ","■"},
{" "," "," ","■"," ","■","■","■"," "},
{" "," "," ","■"," ","■"," "," "," "},
{"■","■","■","■","■","■","■","■","■"}
};
for (int i = 0; i < 9; i++)
{
for (int j = 0; j < 9; j++)
{
Console.Write(zi[i, j]);
}
Console.WriteLine();
}