案例一:for循环嵌套
1 //输入年,月,日,判断格式是否正确 2 for (; ; ) 3 { 4 Console.Write("请输入年份:"); 5 int y = int.Parse(Console.ReadLine()); 6 if (y >= 0 && y < 9999) 7 { 8 for (; ; ) 9 { 10 Console.Write("请输入月份:"); 11 int m = int.Parse(Console.ReadLine()); 12 if(m>0&&m<=12) 13 { 14 for(;;) 15 { 16 Console.Write("请输入日期:"); 17 int d =int.Parse(Console.ReadLine()); 18 if(d>0&&d<=31) 19 { 20 if(m==1||m==3||m==5||m==7||m==8||m==10||m==12) 21 { 22 Console.WriteLine("输入正确,"+y+"年,"+m+"月,"+d+"日"); 23 break; 24 } 25 else if(m==4||m==6||m==9||m==11) 26 { 27 if(d>0&&d<=30) 28 { 29 Console.WriteLine("输入正确,"+y+"年,"+m+"月,"+d+"日"); 30 break; 31 } 32 else 33 { 34 Console.WriteLine("输入有误"); 35 } 36 } 37 else 38 { 39 if(y%4==0&&y%100!=0||y%400==0) 40 { 41 if(d>0&&d<=29) 42 { 43 Console.WriteLine("输入正确,"+y+"闰年,"+m+"月,"+d+"日"); 44 break; 45 } 46 else 47 { 48 Console.WriteLine("输入有误"); 49 } 50 } 51 else 52 { 53 if(d>0&&d<=28) 54 { 55 Console.WriteLine("输入正确,"+y+"平年,"+m+"月,"+d+"日"); 56 break; 57 } 58 else 59 { 60 Console.WriteLine("输入有误"); 61 } 62 } 63 } 64 break; 65 } 66 else 67 { 68 Console.WriteLine("输入有误"); 69 } 70 } 71 break; 72 } 73 else 74 { 75 Console.WriteLine("输入有误"); 76 } 77 } 78 break; 79 } 80 else 81 { 82 Console.WriteLine("输入有误"); 83 } 84 }
案例二:一维数组应用
1 //输入10个人的成绩,求他们的和和平均分; 2 Console.Write("请输入人数:"); 3 int a = int.Parse(Console.ReadLine()); 4 double[] fen = new double[a]; 5 double sum = 0; 6 for (int i = 0; i < a; i++) 7 { 8 Console.Write("请输入第"+(i+1)+"个人的分数"); 9 fen[i] = double.Parse(Console.ReadLine()); 10 sum += fen[i]; 11 } 12 13 Console.WriteLine("成绩总和是"+sum+",平均分是"+(sum/a)+"");
案例三:二维数组应用
1 //输入班级人数,将每人的语数外三科成绩用二维数组打印出来 2 Console.Write("请输入班级人数:"); 3 int a = int.Parse(Console.ReadLine()); 4 double[,] fen = new double[a, 3]; 5 for (int i = 0; i < a; i++) 6 { 7 for (int j = 0; j < 3; j++) 8 { 9 10 if (j == 0) 11 { 12 Console.Write("请输入第" + (i + 1) + "个人的语文成绩"); 13 } 14 if (j == 1) 15 { 16 Console.Write("请输入第" + (i + 1) + "个人的数学成绩"); 17 } 18 if (j == 2) 19 { 20 Console.Write("请输入第" + (i + 1) + "个人的英语成绩"); 21 } 22 fen[i, j] = double.Parse(Console.ReadLine()); 23 } 24 } 25 Console.ReadLine();
案例四:一维数组的冒泡排序
1 //输入班级人数,输入分数,输出最高分,最低分,去掉2个最高和最低分,求平均分。 2 for (; ; ) 3 { 4 Console.Write("请输入班级人数:"); 5 int a = int.Parse(Console.ReadLine()); 6 if (a >= 5) 7 { 8 double[] fen = new double[a]; 9 double zhong; 10 double sum = 0; 11 for (int i = 0; i < a; i++) 12 { 13 Console.Write("请输入第" + (i + 1) + "个人的分数:"); 14 fen[i] = double.Parse(Console.ReadLine()); 15 } 16 for (int j = 0; j < a; j++) 17 { 18 for (int k = j; k < a - 1; k++) 19 { 20 if (fen[j] < fen[k + 1]) 21 { 22 zhong = fen[k + 1]; 23 fen[k + 1] = fen[j]; 24 fen[j] = zhong; 25 } 26 } 27 sum += fen[j]; 28 } 29 Console.Write("最高分是" + fen[0] + ",最低分是" + fen[(a - 1)] + ",去掉2个最高和最低分后的平均分是:" + (sum - fen[0] - fen[1] - fen[a - 1] - fen[a - 2]) / (a - 4)); 30 break; 31 } 32 else 33 { 34 Console.WriteLine("输入人数不能少于五"); 35 } 36 }
案例五:滚动号码抽奖代码
1 //输入一些手机号,抽奖 2 Console.Write("请输入号码数量"); 3 int a = int.Parse(Console.ReadLine()); 4 string[] hm = new string[a]; 5 for (int i = 0; i < a; i++) 6 { 7 Console.Write("请输入第" + (i + 1) + "个号码:"); 8 hm[i] = Console.ReadLine(); 9 } 10 Console.WriteLine("输入完毕,请按回车键开始滚屏"); 11 Console.ReadLine(); 12 Random ran = new Random(); 13 int j = 0; 14 for (; ; ) 15 { 16 int b = ran.Next(a); 17 Console.Clear(); 18 Console.WriteLine(hm[b]); 19 System.Threading.Thread.Sleep(100); 20 if(j==49) 21 { 22 Console.Clear(); 23 Console.WriteLine(hm[b]); 24 break; 25 } 26 j++; 27 } 28 Console.ReadLine();
案例六:人机对战【剪子包袱锤】
1 for (; ; ) //48行代码 2 { 3 Console.WriteLine("剪子【1】包袱【2】锤【3】"); 4 Console.WriteLine("你出哪个?"); 5 int a = int.Parse(Console.ReadLine()); 6 if (a <= 0 || a > 3) 7 { 8 Console.WriteLine("输入有误"); 9 } 10 else 11 { 12 switch (a) 13 { 14 case 1: 15 Console.WriteLine("你出的是剪子"); 16 break; 17 case 2: 18 Console.WriteLine("你出的是包袱"); 19 break; 20 case 3: 21 Console.WriteLine("你出的是锤子"); 22 break; 23 } 24 System.Threading.Thread.Sleep(1000); 25 Random ran = new Random(); 26 int b = ran.Next(3); 27 string[] c = new string[3] { "剪子", "包袱", "锤子" }; 28 Console.WriteLine("电脑出的是:" + c[b]); 29 //剪子 包袱 锤 a 30 // 1 2 3 31 // 剪子 包袱 锤 b 32 // 0 1 2 33 if (a - b == 3 || a - b == 0) 34 { 35 Console.WriteLine("你赢了"); 36 break; 37 } 38 if (a - b == 2 || a - b == -1) 39 { 40 Console.WriteLine("你输了"); 41 break; 42 } 43 else 44 { 45 Console.WriteLine("平局,再来!"); 46 } 47 } 48 } 49 Console.ReadLine();