今天学了if 条件语句和作用域。作用域可以用一句话来概括：儿子可以用爹的所有东西，爹不可以用儿子的任何东西。If条件语句我用几个练习题来解释。
1、“请输入年份：”
判断是否是闰年，“xxxx年是闰年”，“xxxx年不是闰年”
namespace _2017_2_21 { class Program { static void Main(string[] args) { Console.Write("请输入年份："); int a=Convert.ToInt32(Console.ReadLine()); if(a>0&&a<9999&&a%4==0&&a%100!=0||a%400==0) { Console.Write(a+"年是闰年"); } else { Console.Write(a+"年不是闰年"); } Console.ReadLine(); } } }
2、“请输入您的分数：”
小于0，大于100，“输入的分数有误！”
大于0，小于10，“不及格！学渣！”
小于60，“不及格！继续努力！”
大于等于60，“恭喜你！及格了！”
大于等于90，“学霸！很厉害！”
namespace _2017_2_21 { class Program { static void Main(string[] args) { Console.Write("请输入您的分数："); Double a=Convert.ToDouble(Console.ReadLine()); if(a<0||a>100) { Console.WriteLine("输入的分数有误！"); } if(a>0&&a<10) { Console.WriteLine("不及格！学渣！"); } if(a>=10&&a<60) { Console.WriteLine("不及格！继续努力！"); } if(a>=60&&a<90) { Console.WriteLine("恭喜你！及格了！"); } if(a>=90&&a<=100) { Console.WriteLine("学霸！很厉害！"); } Console.ReadLine(); } } }
3、猜拳
“请输入您的手势（石头/剪子/包袱）：”
“用户赢了” “电脑赢了” “平局”
namespace _2017_2_21 { class Program { static void Main(string[] args) { Console.Write("请输入您的手势（石头/剪子/包袱）:"); String you=Console.ReadLine(); Random n = new Random(); int a = n.Next(1, 4); Console.WriteLine(a); if ((you == "石头" && a == 2) || (you == "剪子" && a == 3) || (you == "包袱" && a == 1)) { Console.Write("你赢了"); } else if((you=="石头"&&a==1)||(you=="剪子"&&a==2)||(you=="包袱"&&a==3)) { Console.Write("平了"); } else { Console.Write("你输了"); } Console.ReadLine(); } } }
4、人工智能对话
如果说的是同一句话，不一定要回复同一句
namespace _2017_2_21 { class Program { static void Main(string[] args) { Console.WriteLine("请说话:"); String a = Console.ReadLine(); Random n = new Random(); int g = n.Next(0, 5); if (g == 1) { Console.WriteLine("哈哈"); } else if (g == 2) { Console.WriteLine("嘻嘻"); } else if (g == 3) { Console.WriteLine("你好"); } else if (g == 4) { Console.WriteLine("汪汪"); } else if (g == 0) { Console.WriteLine("hello"); } Console.ReadLine(); } } }
1、“请输入年份：”（1-9999）
“请输入月份：”（1-12）
“请输入日期：”（要判断大小月，判断闰年）
判断输入的时间日期是否正确
2、计算输入的时间是当前这一年的第几天
namespace _2017_2_22作业1 { class Program { static void Main(string[] args) {int year, month, date,num; Console.WriteLine("请输入年份：（1-9999）"); year=Convert.ToInt32(Console.ReadLine()); if (year >= 1 && year <= 9999) { Console.WriteLine("请输入月份："); month = Convert.ToInt32(Console.ReadLine()); if (month >= 1 && month <= 12) { Console.WriteLine("请输入日期："); date = Convert.ToInt32(Console.ReadLine()); if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12 && date >= 1 && date <= 31) { Console.WriteLine("您输入的日期格式正确"); if(month==1) { num = date; Console.WriteLine("您输入的日期是当年的第"+num+"天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 3) { num = 31 + 29 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 3) { num = 31 + 28 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 5) { num = 31 + 29 + 31+30+date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 5) { num = 31 + 28 + 31 + 30 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 7) { num = 31 + 29 + 31 + 30 +31+30+ date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 7) { num = 31 + 28 + 31 + 30 + 31 + 30 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 8) { num = 31 + 29 + 31 + 30 + 31 + 30 +31+ date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 8) { num = 31 + 28 + 31 + 30 + 31 + 30 + 31 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 10) { num = 31 + 29 + 31 + 30 + 31 + 30 +31+31+30+ date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 10) { num = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 12) { num = 31 + 29 + 31 + 30 + 31 + 30+31+31+30+31+30+ date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 12) { num = 31 + 28 + 31 + 30 + 31 + 30+31+31+30+31+30+date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } } else if ((month == 4 || month == 6 || month == 9 || month == 11) && date >= 1 && date <= 30) { Console.WriteLine("您输入的日期格式正确"); if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 4) { num = 31 + 29 + 31+ date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 4) { num = 31 + 28 + 31 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 6) { num = 31 + 29 + 31 + 30 +31+date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 6) { num = 31 + 28 + 31 + 30 + 31 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 9) { num = 31 + 29 + 31 + 30 + 31 + 30+31+31+ date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 9) { num = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month ==11) { num = 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30+31+ date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 11) { num = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + date; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } } else if ((year >= 1 && year <= 9999 && year % 4 == 0 && year % 100 != 0 || year % 400 == 0) && month == 2 && date >= 1 && date <= 29) { Console.WriteLine("您输入的日期格式正确"); num = 31 + 29; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else if ((year >= 1 && year <= 9999 && year % 4 != 0 || year % 100 == 0 || year % 400 != 0) && month == 2 && date >= 1 && date <= 28) { Console.WriteLine("您输入的日期格式正确"); num = 31 + 28; Console.WriteLine("您输入的日期是当年的第" + num + "天"); } else { Console.WriteLine("您输入的日期格式不对"); } } else { Console.WriteLine("您输入的月份格式错误"); } } else { Console.WriteLine("您输入的年份格式错了"); } Console.ReadLine(); } } }
3、标准体重
男士体重 = 身高 - 100 +-3
kg cm
女士体重 = 身高 - 110 +-3
namespace _2017_2_22标准体重 { class Program { static void Main(string[] args) {Console.WriteLine("请输入您的性别"); String sex=Console.ReadLine(); Console.WriteLine("请输入您的体重"); int weight = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("请输入您的身高"); int height =Convert.ToInt32( Console.ReadLine()); if (sex == "男" && (height - weight - 100 >= -3 || height - weight - 100 <= 3)) { Console.WriteLine("您的体重是标准体重"); } else { if (height - weight - 100 < -3) { Console.WriteLine("您超重"); } if (height - weight - 100>3) { Console.WriteLine("您偏瘦"); } Console.ReadLine(); } if (sex == "女" &&( height - weight - 110 >= -3 || height - weight - 110 <= 3)) { Console.WriteLine("您的体重是标准体重"); } else { if (height - weight - 110 < -3) { Console.WriteLine("您超重"); } if (height - weight - 110 > 3) { Console.WriteLine("您偏瘦"); } Console.ReadLine(); } } } }
4、猜拳将用户的手势和电脑的手势输出出来
namespace _2017_2_22猜拳游戏显示手势 { class Program { static void Main(string[] args) { Console.Write("请输入您的手势（石头/剪子/包袱）:"); String you = Console.ReadLine(); Random n = new Random(); int a = n.Next(1, 4); if (a==1) { Console.WriteLine("石头"); } if (a == 2) { Console.WriteLine("剪子"); } if (a == 3) { Console.WriteLine("包袱"); } if ((you == "石头" && a == 2) || (you == "剪子" && a == 3) || (you == "包袱" && a == 1)) { Console.Write("你赢了"); } else if ((you == "石头" && a == 1) || (you == "剪子" && a == 2) || (you == "包袱" && a == 3)) { Console.Write("平了"); } else { Console.Write("你输了"); } Console.ReadLine(); } } }
5、“请输入24小时制的时间：”
0-24 如果超出“时间输入有误”
namespace _2017_2_22时间24小时制转变成12小时制 { class Program { static void Main(string[] args) { Console.WriteLine("请输入24小时制的时间："); int a =Convert.ToInt32( Console.ReadLine()); if(a>24||a<0) { Console.WriteLine("输入的时间有误"); } if(a<=12&&a>6) { Console.WriteLine("上午"+a+"点"); } if(a<=6) { Console.WriteLine("凌晨" + a + "点"); } int b = a - 12; if(a>12&&a<24) { Console.WriteLine("下午" + b + "点"); } if(a==24) { Console.WriteLine("凌晨0点"); } Console.ReadLine(); } } }
