C#编程入门程序(8).doc

c#程序设计基础必做习题集（3）十一.多重循环任务76：按照以下的要求编写程序：（1） 编写程序利用for循环在控制台上打印一行10个“*”；（2） 编写程序利用二重for循环在控制台上打印10行10列个“*”。参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) for (int i = 1; i = 10; i+) Console.Write(*); Console.WriteLine(n-); for (int i = 1; i = 10; i+) for (int j = 1; j = 10; j+) Console.Write(*); Console.Write(n); Console.ReadKey(); 任务77：编写程序利用二重循环打印如下的图形：*参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) for (int i = 1; i = 10; i+) /一共印打10行 for (int j = 1; j = i; j+) /第i行打印i个“*” Console.Write(*); Console.Write(n); Console.ReadKey(); 任务78：编写程序利用二重循环打印如下图形：*参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) for (int i = 4; i = 9;i+ ) for (int j = 1; j = i; j+) Console.Write(*); Console.Write(n); Console.ReadKey(); 任务79：打印10行“*”，要求每行“*”的个数是个0到20之间的随机整数。参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) Random rnd = new Random(); for (int i = 1; i = 10; i+) int x = rnd.Next(0,20); /产生0到20之间的随机整数x for (int j = 1; j = x; j+) /每行打印x个“*” Console.Write(*); Console.Write(n); Console.ReadKey(); 任务80：编写程序，利用二重循环打印如下的图形： * * * * *参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) Console.WriteLine( *); /空8，打11 Console.WriteLine( *); /空7，打32 Console.WriteLine( *); /空6，打53 Console.WriteLine( *); /空5，打74 Console.WriteLine( *); /空4，打95 Console.WriteLine( *); /空3，打116 /空格数=f(i)=9-i /星的个数=g(i)=2*i-1 /第i行，需要先打印-i个空格，再打印*i-1个“*” for (int i = 1; i = 6; i+) for (int j = 1; j = 9 - i; j+) /打印第i行的空格 Console.Write( ); for (int j = 1; j = 2 * i - 1; j+) /打印第i行的“*” Console.Write(*); Console.Write(n); Console.ReadLine(); 任务81：编写程序打印如下的图形：AAAAAAAAAABBBBBBBBBBCCCCCCCCCCDDDDDDDDDEEEEEEEEEEFFFFFFFFFFFGGGGGGGGGHHHHHHHHH参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) for (int i = 1; i = 8; i+) /控制打印8行 for (int j = 1; j = 10; j+) /控制每行打印的字母 Console.Write(char)(i+64); Console.Write(n); Console.ReadKey(); 任务82：有两个乒乓球队一队和二队，一队的选手有A、B、C、D、E五名选手，二队的选手有F、G、H、I、J，要求两个队的所有选手两两进行对阵，请编写程序打印比赛对阵情况表。（也可以通过穷举法去掉相等的情况）参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication7 class Program static void Main(string args) for (char team1 = A; team1 = E; team1+) for (char team2 = F; team2 = J; team2+) Console.WriteLine(team1+-+team2); Console.ReadLine(); 任务83：已知有A、B、C、D、E、F、G六支篮球队参加篮球比赛，本次比赛采用的方式是打循环赛，即每两支球队之间都需要进行对阵，编写程序，打印本次比赛的对阵情况表。（也可以通过穷举法去掉相等的情况）参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication7 class Program static void Main(string args) for (char team1 = A; team1 = E; team1+) for (char team2 = (char)(team1 + 1); team2 = F; team2+) Console.WriteLine(team1+-+team2); Console.ReadLine(); 任务84：公元五世纪末，我国古代的数额学家张丘建在的算经中提出了著名的“百钱百鸡问题”：一只公鸡5元钱，一只母鸡3元钱，三只小鸡一元钱，现在又100元钱，要正好买100只鸡，可以买公鸡、母鸡、小鸡各多少只？请打印所有的买法。参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) /x表示公鸡的个数，y表示母鸡的个数，z表示小鸡的个数 Console.WriteLine(所有的买法如下：); for (int x = 0; x = 20; x+) for (int y = 0; y = 33; y+) int z = 100 - x - y; if (z % 3 = 0 & x * 5 + y * 3 + z / 3 = 100) Console.WriteLine(公鸡0只，母鸡1只，小鸡2只；,x,y,z); Console.ReadKey(); 任务85：编写程序利用二重循环，求出所有的1000到10000之间的素数：参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) for(int i=1000;i=10000;i+) bool isPrime=true; for (int j = 2; j = i - 1; j+) /判断i是否是素数 if (i % j = 0) isPrime = false; if (isPrime) /通过标志变量来决定是否是素数 Console.Write(i+ ); Console.ReadKey(); 任务86：打印如下图所示的乘法口诀表：参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1 class Program static void Main(string args) for (int i = 1; i = 9; i+) for (int j = 1; j = i; j+) Console.Write(0*1=2 ,j,i,j*i); Console.WriteLine(); Console.ReadLine(); 任务87：随机产生8个0到15之间的整数，编写程序求出这8个随机整数的阶乘，再求出这8个阶乘的和。参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication4 class Program static void Main(string args) Random rnd = new Random(); long sum = 0; for (int i = 1; i 0) for (int j = 1; j = x; j+)/求x的阶乘 p = p * j; Console.WriteLine(0！=1, x, p); else p = 1; /0的阶乘是1 sum = sum + p; /求所有阶乘的和 Console.WriteLine(所有以上的阶乘之和=0, sum); Console.ReadKey(); 任务88：随机产生10个100到10000之间的整数，求这10个随机整数的逆数（即反向数），并求这些逆数的和。参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication4 class Program static void Main(string args) Random rnd=new Random(); int sum = 0; for (int i = 1; i = 10; i+) int r = rnd.Next(10,10000); Console.Write(0的逆数是：,r); int reverse=0; do int p=r%10; /获取个位数 reverse=reverse*10+p; r=r/10; while(r!=0); Console.WriteLine(reverse); sum = sum + reverse; /求所有逆数之和 Console.ReadKey(); 任务89：编写程序找出2到10000之间的所有个位数是1的素数，并显示出来，要求每行显示5个。参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication4 class Program static void Main(string args) int count = 0; for (int i = 2; i = 10000; i+) bool isPrime = true; /判断i是否是素数 for (int j = 2; j = i-1; j+) if (i % j = 0) isPrime = false; break; if (isPrime) /如果是素数，在判断它的各位是否是1 if(i%10=1) /个位数是1 Console.Write(i + ); count+; if (count % 5 = 0) /控制每显示5个就换一行 Console.Write(n); Console.ReadKey(); 任务90：通过键盘输入一个正整数n，找出1到n之间所有的回文数。所谓的回文数指本身等于它的逆数的数。参考代码：using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication4 class Program static void Main(string args) Console.Write(请输入一个正整数n：); int n = Convert.ToInt32(Console.ReadLine(); for (int i = 1; i = n; i+) int former = i; /原数 int reverse=0; /反向数 do /求反向数 int p=former%10; reverse=reverse*10+p; former=former/10; while(former!=0); if (i = reverse) /反向数就是本身，就是回文数 Console.Write(i+ ); Console.ReadKey(); 任务91：编写一个程序，从键盘上输入n个自然数，求最大公约数。（输出-1为止）int m, n, r; m = Convert.ToInt32(Console.ReadLine(); n = Convert.ToInt32(Console.ReadLine(); do r = m % n; while (r != -1) m = n; n = r; r = m % n; m = Convert.ToInt32(Console.ReadLine(); while (m != 0); Console.WriteLine(n);任务92：对任意整数进行因数分解。 int x; x = Convert.ToInt32(Console.ReadLine(); Console.Write(x + =); for (int i = 2; i = x - 1; i+) while (x % i = 0) if (x / i = 1) Console.Write(i); break; else Console.Write(i + *); x = x / i;