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編寫兩個方法分別計算組合數n!. 一個使用遞歸方法實現，另一個不用遞歸方法。（10分）<BR>4、
編寫一個程序，在控制臺接收數據，程序會讓用戶輸入名字，并檢查用戶的輸入：不允許輸入空名字：<BR>
一旦用戶完成輸入，程序會向該用戶發出問候：“Hello,你輸入的名字。”<BR><BR>（提示：如果希望在控制臺中與<BR>用戶交互，一種可能的做法就是將System.in包裝成BufferedReader 要做到這一點，必須使用<BR>InputStreamReader類將System.in這個InputStream對象轉換成一個Reader <BR>即BufferedReader in=new BufferedReader(new InputStreamReader(System.in));</P>
<P>參考答案：</P>
<P>第一大題：選擇題（60分）<BR>1、B 2、D 3、C 4、B 5、C 6、A 7、C 8、A 9、D 10、B<BR>11、A 12、AC 13、A 14、AD 15、AB 16、A 17、B 18、A 19、D 20、AB<BR>第二大題：<BR>1、public class Sum{<BR>public static void main(String args[])<BR>{<BR>int i=1;<BR>int sum=0;<BR>for(i=1;i<=100;i=i+2)<BR>{sum=sum+I;}<BR>System.out.println("1+3+5+.....+99="+sum);<BR>}<BR>}<BR>2、import java.io.*;<BR>public class read{<BR>public static void main(String args[])<BR>throws IOException{<BR>char c;<BR>BufferedReader br=new BufferedReader(new InputStreamReader(System.in));<BR>System.out.println("請輸入字符,輸入'e'或者'E'退出."）<A
href="file:///C:/Documents%20and%20Settings/Administrator/桌面/java/JAVA第一次模擬考試答案.files/wink.gif"
target=_blank></A>;<BR>do{<BR>c=(char)br.read();<BR>System.out.println(c);<BR>}while(c!='e' && c!='E');<BR>}<BR>}<BR><BR><BR>3、public class Fact{<BR>public static void main(String args[])<BR>{<BR>System.out.println("5! = "+fact1(5));<BR>System.out.println("4! = "+fact2(4));<BR>}<BR>public static int fact1(int n)<BR>{<BR>//遞歸方法<BR>if(n==0)<BR>return 1;<BR>else <BR>return n*fact1(n-1);<BR>}<BR>public static int fact2(int n)<BR>{<BR>//非遞歸方式<BR>int ret=n;<BR>for(int i=1;i<n;i++)<BR>ret=ret*i;<BR>return ret;<BR>}<BR>}<BR><BR><BR>4、import java.io.*;<BR>public class ConsoleInput{<BR>
public static void main(String args[])throws IOException{<BR>
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));<BR>
System.out.println("Enter your name:");<BR>
String name=in.readLine();<BR>
while(name.trim().length()==0){<BR>
System.out.println("Enter your name:")<A
href="file:///C:/Documents%20and%20Settings/Administrator/桌面/java/JAVA第一次模擬考試答案.files/wink.gif"
target=_blank></A>;<BR>
name=in.readLine();<BR>
}<BR>
System.out.println("Hello,"+name.trim());<BR>
in.close();<BR>}<BR>}<BR></P>
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