JAVA实验报告

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3、package start;

import java.io.BufferedReader; import java.io.FileOutputStream; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException;

public class Xiugai { public static void main(String args[]) throws IOException {

FileReader bout=new

FileReader(\); BufferedReader fout1 =new BufferedReader(bout); String value; int i=0;

String a[] = new String[6];

while((value=fout1.readLine())!=null) {

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}

a[i]=value; i++;

System.out.println(\原来的成绩\); for(int j=0; j<5; j++) { }

System.out.println(a[j]);

a[2]=String.valueOf(((Integer.parseInt(a[0])+Integer.parseInt(a[1])+Integer.parseInt(a[2])+Integer.parseInt(a[3])+Integer.parseInt(a[4]))/5));

bout.close();

FileOutputStream testfile = new

FileOutputStream(\);

testfile.close();

testfile.write(new String(\).getBytes()); FileWriter fout=new

FileWriter(\,true);

for(int i1=0; i1<5; i1++) { }

System.out.println(\修改后的成绩\); for(int j=0; j<5; j++) {

fout.write(a[i1]+\);

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}

}

System.out.println(a[j]);

fout.close();

4、

}

package TEST4; import java.util.Scanner; public class test4 {

public static void main(String[] args){

System.out.println(\请输入一个小于99999的整数：\); Scanner s=new Scanner(System.in); int a=s.nextInt();

if(a>99999)System.out.println(\); if(a>9999) {

System.out.println(\位\);int []x=new int[5];

x[0]=a;x[1]=(a/10);x[2]=a/100;x[3]=a/1000;x[4]=a/10000; for(int i=0;i<=4;i++) { }

System.out.print(x[i]);

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}

if(a>999&a<10000) { System.out.println(\位\);int []x=new int[4]; x[0]=a;x[1]=(a/10);x[2]=a/100;x[3]=a/1000; for(int i=0;i<=3;i++) { System.out.print(x[i]);

}

}

if(a>99&a<1000) { System.out.println(\位\);int []x=new int[3]; x[0]=a;x[1]=(a/10);x[2]=a/100; for(int i=0;i<=2;i++) { System.out.print(x[i]);

}

}

if(a>9&a<100){ System.out.println(\位\);int []x=new int[2]; x[0]=a;x[1]=a/10; for(int i=0;i<=1;i++) { System.out.print(x[i]);

}

}

if(a>0&a<10){

System.out.println(\位\); System.out.print(a); }

}

}

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