C#課后習題答案

1、1、 編寫程序（輸入一個華氏溫度，輸出一個攝氏溫度。公式C=(F-32)*5/9）static void Main(string args) Console.WriteLine(請輸入華氏溫度：); double f = double.Parse(Console.ReadLine(); double c = (f - 32) * 5 / 9; Console.WriteLine(對應攝氏溫度為： + c); Console.ReadLine(); 2、 編寫一個C#控制臺應用程序，對于輸入的正整數(shù)n，計算1!+2!+3!+n!的值并輸出結果。public int fn(int n) int s

2、um = 0, m = 1; for (int i = 1; i =0; i-) Console.Write(si); Console.Read(); 4、 C#寫一個輸入三個整數(shù)，按大到小順序輸出的小程序int arr = new int3; for (int i = 0; i arr.Length; i+) Console.WriteLine(請輸入第 + (i + 1) + 個數(shù)); arri = Convert.ToInt32(Console.ReadLine(); for (int i = 0; i arr.Length - 1; i+) for (int j = 0; j arr.

3、Length - 1 - i; j+) if (arrj arrj + 1) int temp = arrj; arrj = arrj + 1; arrj + 1 = temp; for (int i = 0; i total ) /如果輸入2010 2 29就會出錯 txtXianShi.Text = 該天不存在;else if (y = 1 & y = 1 & m = 12) for (int i = 1; i = m; i+) /循環(huán)累加天數(shù) switch (i) case 1: case 3: case 5: case 7: case 8: case 10: case 12: coun

4、t = 31; break; case 4: case 6: case 9: case 11: count = 30; break; case 2: if (y % 100 != 0)&(y % 4 = 0)|(y % 400 = 0) count = 29; else count = 28; break; sum = sum + count; /循環(huán)一次累加一個月的天數(shù) txtXianShi.Text = sum.ToString(); /類型轉換后輸出 else txtXianShi.Text = 你輸入的年份不正確！請重新輸入！; else txtXianShi.Text = 你輸入的月

5、份不正確！請重新輸入！; 6、求公式1/2+3/2+5/3+8/5+13/8+21/13+.中前20項的和#include intmain()doublea = 2.0,b = 1.0;doublesum = 0.0;inti = 0;while( i 20 )sum += a / b;doubletemp = b;b = a;a = a + temp;i+;printf(sum = %lfn,sum);return0;7、雞兔同籠,雞兔共30只,腳90只,計算共多少只雞多少只兔#includemain() int chicken, rabbit; int legs = 90, sum = 3

6、0; rabbit = (90-30*2)/2; chicken = 30 - rabbit; printf(%d只兔子，%d只雞, rabbit, chicken);8、 編輯程序，求1100之間的所有質數(shù)using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication10 class Program static void Main(string args) int min, max, i, j, n; bool flag; Conso

7、le.WriteLine( 素數(shù) n); Console.WriteLine( 輸入范圍的下限（不小于2）); min = Convert.ToInt16(Console.ReadLine(); Console.WriteLine( 輸入范圍的上限); max = Convert.ToInt16(Console.ReadLine(); n = 0; /初始化素數(shù)的個數(shù)為0 for (i = min; i = max;i+ ) /i為min到max之間的所有自然數(shù) flag = true; /設置為真 for (j = 2; j = Math.Sqrt(i);j+ ) if (i % j = 0

8、) /如果i能被j整除 flag = false; /設置標記為假 break; /退出內循環(huán) if (!flag) /如果標記為假 continue; / 退出本次循環(huán) Console.Write(0,6,i); /輸出素數(shù) n+; /素數(shù)遞增 if(n%10=0) /沒輸出十個素數(shù)換一次行 Console.WriteLine(); Console.WriteLine(n 0到1之間的素數(shù)共有2,min,max,n); Console.ReadLine(); 9、編寫程序,顯示10個單項選擇題,用戶選擇答案并提交后給出分數(shù)(1)在設計中拉十個RadioButton控件和一個Button控件。

9、雙擊Button控件，寫入以下代碼！protected void Button1_Click(object sender, EventArgs e) int n=0;int i=0;if(RadioButton1.Checked=true)n=n+10;i+;if(RadioButton2.Checked=true)n=n+10;i+;.if(RadioButton10.Checked=true)n=n+10;i+;你將n打出來它就是你要的分數(shù),而i就是正確答案的個數(shù)(2)Gridview中的RadioButton在Gridview中放了一個radiobutton組 asp:Label id=

10、sque runat=server Text= asp:Label id=key runat=server Text= Visible=false asp:RadioButton id=RadioButton1 runat=server Text= GroupName= asp:RadioButton id=RadioButton2 runat=server Text= GroupName= asp:RadioButton id=RadioButton3 runat=server Text= GroupName= asp:RadioButton id=RadioButton4 runat=se

11、rver Text= GroupName= asp:SqlDataSource ID=paperconn runat=server ConnectionString= SelectCommand=SELECT Answer_A, Answer_B, Answer_C, Answe_D, Answe_Key, Ques_Squc, Ques_Title FROM Ques_Info WHERE (File_ID = File_ID) ORDER BY Ques_Squc 結果點擊交卷按鈕后執(zhí)行 protected void papersubmit_Click(object sender, Eve

12、ntArgs e) int score = 0; foreach (GridViewRow dr in GridView1.Rows) string str = ; string key = ; key = (Label)GridView1.Rows0.FindControl(key).Text; int radio_pre = GridView1.Controls.Count; if (RadioButton)dr.FindControl(RadioButton1).Checked) str = A; else if (RadioButton)dr.FindControl(RadioButton2).Checked) str = B; else if (RadioButton)dr.FindControl(RadioButton3).Checked) str = C; else if (RadioButton)dr.FindContro