e0509.java

java小程序

import java.io.*;
public class E0509
{
public static void main(String args[]) throws IOException
{
BufferedReader br=new BufferedReader(new FileReader("E0507.txt"));
BufferedWriter bw=new BufferedWriter(new FileWriter("E0509.txt"));
StreamTokenizer st=new StreamTokenizer(br);
int tokenType;
long[] score=new long[4];
int i=0;
double ave;
while(br.ready())
{
tokenType=st.nextToken();
switch(tokenType)
{
case StreamTokenizer.TT_NUMBER: 
  score[i]=(long)st.nval;
  bw.write(String.valueOf((long)st.nval)); 
  bw.write(" ");
  i++;
  if(i%2==0)
  {ave=(double)((score[i-2]+score[i-1])/2.0);
  bw.write(String.valueOf((double)ave));
  bw.newLine();
  }
  break;   
case StreamTokenizer.TT_WORD:   
  bw.write(st.sval);   
  bw.write(" ");  
  break;   
  default:  
  ;
}
}
bw.close();
}
}