c#实训基础题部分

1、使用控制台方式实现如下应用程序：基础题部分：1、写一个程序，完成以下功能：从键盘上输入5个整数，求出最大最小值。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) Console.Write("please enter 5 figure:"); double a = new double5; for (int i =

2、0; i < 5; i+) ai = int.Parse(Console.ReadLine(); double min = a0; double max = a0; for (int j=0;j < 4;j+) if (max < aj + 1) max = aj+1; Console.WriteLine("max = "+max); for (int p = 0;p<4;p+) if (min > ap + 1) min = ap+1; Console.WriteLine("min = "+min); 2、写一个程序，打印

3、出九九乘法表。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) for (int i = 1; i < 10; i+) for (int j = 1;j<i+1;j+) Console.Write(" "+i + " X " + j + "=" + (i * j);

4、 Console.WriteLine(" "); 3、分别使用for循环和while循环设计一个程序，计算从1加到100的和。For循环：using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) int sum = 0; for (int i = 1; i <= 100; i+) sum = sum + i; Cons

5、ole.WriteLine("sum = " + sum); While循环：using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) int sum = 0; int i = 1; while (i <= 100) sum = sum + i; i+; Console.WriteLine("sum = &q

6、uot; + sum); 4、利用数学类提供的平方根方法计算并输出1.0，2.0，3.0，10.0的平方根。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) double x = 0.0; for (double i = 1.0; i <= 10.0; i=i+1) x = Math.Sqrt(i); Console.WriteL

7、ine(i + "2=" + x); 5、随机数方法产生5个110（包括1和10）之间的整数。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) for (int i = 0; i < 5; i+) Random ran = new Random(i); int Randomkey = ran.Next(1, 1

8、0); Console.WriteLine(Randomkey); 6、编程实现：随机产生120之间的整数，总共生成1000次，统计其中生成的整数0，1，2，3，. ，20的个数分别是多少，并输出统计结果（每5个数一行）。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) int A; A = new int 21; for (int i

9、 = 0; i < 1000; i+) Random ran = new Random(i); int Randomkey = ran.Next(0, 20); int x = Randomkey; Ax+; for (int j = 0; j < 20; j+) Console.Write(Aj+" "); if (j + 1) % 5 = 0) Console.WriteLine(" "); 7、统计字符串“a12bcd?A*B34”中分别有多少个数字和字母。using System;using System.Collections.Ge

10、neric;using System.Linq;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) int num = 0; int alpha = 0; String s = "a12bcd?A*B34" for (int i = 0; i < s.Length; i+) String ch = s.Substring(i, 1); if (char.IsNumber(ch,0) num+; else if (char.IsUpper(

11、ch,0) | char.IsLower(ch,0) alpha+; Console.WriteLine("num = "+num+" ,alpha = "+alpha); 8、编写程序，要求用户输入月份号码，然后显示该月的英文名称。例如，如果用户输入2，程序应显示February。要求月的英文名称存于数组中。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1 class Progra

12、m static void Main(string args) /string month = new string12; / month = ("January","February","March","April","May","June","July","August","September","October","November","December&quo

13、t;); Console.Write("请输入您要的月数："); string a = Convert.ToString(Console.ReadLine(); switch(a) case "1": Console.WriteLine("January"); break; case "2": Console.WriteLine("February"); break; case "3": Console.WriteLine("March"); break;

14、 case "4": Console.WriteLine("April"); break; case "5": Console.WriteLine("May"); break; case "6": Console.WriteLine("June"); break; case "7": Console.WriteLine("July"); break; case "8": Console.WriteLine("

15、;August"); break; case "9": Console.WriteLine("September"); break; case "10": Console.WriteLine("October"); break; case "11": Console.WriteLine("November"); break; case "12": Console.WriteLine("December"); break; de

16、fault: Console.WriteLine("请重新输入"); break; 9、请输入一个代表项数的正整数N（N 100），然后输出1-3+5-7+9-11+前N项的和。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) int n = 0; double sum = 0; Console.Write(&quo

17、t;请输入一个代表项数的正整数N（N 100）:"); int a = Convert.ToInt32(Console.ReadLine(); for (int i = 1; i <= a; i = i + 2,n+) sum = (Math.Pow(-1,n)*i) + sum; Console.WriteLine("sum = " + sum); 10、请编写两个程序，分别通过if语句和switch语句两种方式完成，输入一个成绩，将百分制成绩转换成等级制成绩（A为10090 , F为不及格）。If程序using System;using System.C

18、ollections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) Console.Write("请输入成绩："); double great = Convert.ToDouble(Console.ReadLine(); if (great >= 90) Console.WriteLine("等级为：A"); else if (90 > great &am

19、p;& great >= 80) Console.WriteLine("等级为：B"); else if (80 > great && great >= 70) Console.WriteLine("等级为：C"); else if (70 > great && great >= 60) Console.WriteLine("等级为：D"); else Console.WriteLine("等级为：F不及格"); Swich程序using Sys

20、tem;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) Console.Write("请输入成绩："); int great = Convert.ToInt32(Console.ReadLine(); int x = great / 10; switch (x) case 10: case 9: Console.WriteLine(&quo

21、t;等级为：A"); break; case 8: Console.WriteLine("等级为：B"); break; case 7: Console.WriteLine("等级为：C"); break; case 6: Console.WriteLine("等级为：D"); break; default: Console.WriteLine("等级为：F不及格"); break; 11、读入两个正整数m和n，输出m和n的最小公倍数。using System;using System.Collectio

22、ns.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) Console.WriteLine("计算两个数的最小公倍数"); Console.Write("请输入第一个数:"); int num1 = int.Parse(Console.ReadLine(); Console.Write("请输入第二个数:"); int num2 = int.Parse

23、(Console.ReadLine(); int gys = gongyue(num1, num2); int gbs = (num1 * num2) / gys; Console.WriteLine("最小公倍数为：" + gbs); static int gongyue(int num1, int num2) int temp = num1 % num2; if (temp = 0) return num2; else return gongyue(num2,temp); 12、判断一个整数n是否为素数。若是则输出：n是素数；否则输出n不是素数（注：n是具体的值）。us

24、ing System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) Console.WriteLine("素数的判断。"); Console.Write("请输入一个正整数："); int num = int.Parse(Console.ReadLine(); int x = 0; for (int i = 2; i

25、< Math.Sqrt(num); i+) if (num % i = 0) Console.WriteLine("不是素数"); x = i; break; if (x = 0) Console.WriteLine("是素数"); 13、用for循环计算s=1!+2!+3!+n!。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static vo

26、id Main(string args) int x = 1; int sum = 0; Console.Write("请输入n = "); int n = int.Parse(Console.ReadLine(); for (int i = 1; i <= n; i+) x = x * i; sum = sum + x; Console.WriteLine("sum = " + sum); 14、编程实现计算11+22+33+44+55+2020using System;using System.Collections.Generic;using

27、 System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) double sum = 0; for (int i = 1; i <= 20; i+) sum = Math.Pow(i, i) + sum; Console.WriteLine("sum = " + sum); 15、编写一个程序，打印出以下图形：*using System;using System.Collections.Generic;using Sys

28、tem.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) for (int i = 1; i <= 3; i +) for (int j = 1; j <= (i * 2) - 1); j = j + 2) Console.Write("*"); Console.WriteLine(" "); for (int i = 1; i <= 3; i+) for (int j = 3; j >=

29、 (i * 2) - 1); j = j - 2) Console.Write("*"); Console.WriteLine(" "); 16、读入一个代表行数的正整数n（n<10），实现下列规则图形的输出。如果：n=4输出：* * * *using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args)

30、Console.Write("输入一个代表行数的正整数n（n<10）:"); int a = int.Parse(Console.ReadLine(); for (int i = a; i>= 1; i-) for (int m = i; m < a; m+) Console.Write(" "); for (int j = 1; j <= i * 2 - 1; j+) Console.Write("*"); Console.WriteLine(" "); 17、请打印由*组成的菱形如下的图

31、形。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) Console.Write("输入一个代表行数的正整数n（n<10）:"); int a = int.Parse(Console.ReadLine(); for (int i = 1; i <= a; i+) for (int m = i; m <

32、; a; m+) Console.Write(" "); for (int j = 1; j <= i * 2 - 1; j+) Console.Write("*"); Console.WriteLine(" "); for (int i = a; i >= 1; i-) for (int m = i; m < a; m+) Console.Write(" "); for (int j = 1; j <= i * 2 - 1; j+) Console.Write("*")

33、; Console.WriteLine(" "); 18、百元买百鸡问题。假定小鸡每只5角，公鸡每只2元，母鸡每只3元。现在有100元钱要求买100只鸡，编程列出所有可能的购鸡方案。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) for (int num3 = 0; num3 < 33; num3+) for

34、 (int num2 = 0; num2 < 50; num2+) for (int num1 = 0; num1 < 200; num1+) if (num1 + num2 + num3 = 100 && (5 * num1) + (20 * num2) + (30 * num3) <= 1000) Console.WriteLine("小鸡有" + num1 + "只，公鸡有" + num2 + "只，母鸡有" + num3 + "只"); 19、有一条长阶梯，若每步跨2阶，则

35、最后剩1阶；若每步跨3阶，则最后剩2阶；若每步跨5阶，则最后剩4阶；若每步跨6阶，则最后剩5阶。只有每次跨7阶，最后才正好一阶不剩。编写程序算出这条阶梯至少有多少阶？using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) for (int x = 1; x < 500; x+) if (x % 2 = 1) && (x

36、% 3 = 2) && (x % 5 = 4) && (x % 6 = 5) && (x % 7 = 0) Console.WriteLine("共有阶梯" + x + "阶"); break; 20、编写递归函数求Fibonacci级数（公式如下），在主函数中实现输入与输出。fib(n) = fib(n-1) + fib(n-2) n>2fib(1) = fib(2) = 1using System;using System.Collections.Generic;using System.Linq

37、;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) Console.Write("请输入n = "); int n = int.Parse(Console.ReadLine(); int sum = fib(n); Console.WriteLine("fib (" + n + ") = " + sum); static int fib(int n) if (n = 1 | n = 2) return

38、1; else return fib(n - 1) + fib(n - 2); 21、读入一个正整数n，判断其是否是回文数，若是则输出：n是回文数；否则输出：n不是回文数。提示：回文数是指这样的自然数，其各位数字顺序读和倒读都一样，例如2，22，121，12321。using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2 class Program static void Main(string args) int s = 0; Console.Write("请输入n = "); int n = int.Parse(Console.ReadLine(); int y = n;