import java.io.*;public class number{
public static void main(String args[]){
try{
InputStreamReader ir;
BufferedReader in;
ir=new InputStreamReader(System.in);
in=new BufferedReader(ir);
String strin="";
int pass=0;
int falure=0;
int count=0;
double sum =0.0;
double average=0.0;
while(!(strin=in.readLine()).equals("-1")) { //"-1"表示输入结束
System.out.println(strin);
if(Integer.parseInt(strin)>=60)
pass++;
else
falure++;
count++;
sum+=Integer.parseInt(strin);
}
average=sum/count;
System.out.println("pass count is : "+pass);
System.out.println("falure count is : "+falure);
System.out.println("arverage is : "+average);
}
catch(Exception e) {
System.err.println(e.getStackTrace());
}
}
}
public static void main(String args[]){
try{
InputStreamReader ir;
BufferedReader in;
ir=new InputStreamReader(System.in);
in=new BufferedReader(ir);
String strin="";
int pass=0;
int falure=0;
int count=0;
double sum =0.0;
double average=0.0;
while(!(strin=in.readLine()).equals("-1")) { //"-1"表示输入结束
System.out.println(strin);
if(Integer.parseInt(strin)>=60)
pass++;
else
falure++;
count++;
sum+=Integer.parseInt(strin);
}
average=sum/count;
System.out.println("pass count is : "+pass);
System.out.println("falure count is : "+falure);
System.out.println("arverage is : "+average);
}
catch(Exception e) {
System.err.println(e.getStackTrace());
}
}
}
import java.io.*;
public class ReadValue {
public static void main(String args[]){
//WriteFile1();
read();
//ReadFile2();
//ReadAndWriteFile();
}
public static void read(){
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String str="";
int noPass=0,pass=0,middle=0,good=0,well=0;
int average=0;
int i = 1;
try{
while((str = br.readLine()).equals("-1") != true){
System.out.println(str);
int value = Integer.parseInt(str);
average = (average * i + value) / i;
if(value<60){
noPass = noPass + 1;
System.out.println(value);
}else if(value>=60 && value<70){
pass = pass + 1;
}else if(value>=70 && value<80){
middle = middle + 1;
}else if(value>=80 && value<90){
good = good + 1;
}else if(value>=90 && value<100){
well = well + 1;
}
i = i + 1;
}
}catch(Exception e){
System.out.println(e.toString());
}
System.out.println(noPass+" "+pass+" "+middle+" "+good+" "+well);
}}
哈哈!bs什么意思?
average = (average * (i-1) + value) / i;
其实很简单,你只要增加个方法就可以了,判断分数是不是在0-100,这个你就自己加吧,可以锻炼一下自己。
你建立一个Tjscore.java的文件,然后加入下面代码:
import java.io.*;
import java.util.*;public class Tjscore {
public static void main(String[] args) {
System.out.println("请输入学生的成绩,-1结束输入");
Vector score = new Vector();
int m = 0, sum = 0;
int buJiGe = 0, jiGe = 0, zhongDeng = 0, liangHao = 0, youXiu = 0;
float pingJunFen = 0;
BufferedReader input = new BufferedReader(new InputStreamReader(
System.in));
try {
m = Integer.parseInt(input.readLine());
} catch (Exception e) {
}
while (m != -1) {
score.add(m + "");
try {
m = Integer.parseInt(input.readLine());
} catch (Exception e) {
}
}
for (int i = 0; i < score.size(); i++) {
m = Integer.parseInt(score.get(i) + "");
sum += m;
if (m < 60)
buJiGe++;
else if (m < 70)
jiGe++;
else if (m < 80)
zhongDeng++;
else if (m < 90)
liangHao++;
else
youXiu++;
pingJunFen = sum / score.size();
}
System.out.println("你共输入了" + score.size() + "个学生的成绩");
System.out.print("成绩概况:");
System.out.println("平均分是" + pingJunFen + "分");
System.out.println("其中:\n" + "不及格的有" + buJiGe + "人;\n" + "及格的有:" + jiGe
+ "人;\n" + "中等的有:" + zhongDeng + "人;\n" + "良好的有:" + liangHao
+ "人;\n" + "优秀的有:" + youXiu + "人。\n");
}
}
就可以用javac Tjscore.java编译 java Tjscore执行了
{
public int a=0;//优秀
public int b=0;//良好
public int c=0;//中等
public int d=0;//及格
public int e=0;//不及格
public double average=0.0;
public Test()
{}
public Test(String [] args)
{
getAverage(args);
}
public void getAverage(String [] args)
{
int n=0;
System.out.println("length="+args.length);
for(int i=0;i<args.length;i++)
{
try
{
double temp=Double.parseDouble(args[i]);
System.out.println("temp="+temp);
if(temp<0)
break;
n++;
///////
if(temp>=90)
a++;
else if(temp>=80)
b++;
else if(temp>=70)
c++;
else if(temp>=60)
d++;
else
e++;
///////
average+=temp;
}
catch(Exception ex)
{
System.out.println("输入的东东中有字符! in getAverage,"+ex);
System.exit(1);
}
}
System.out.println("n="+n+",average="+average);
average=average/n;
}
public static void main(String [] args)
{
Test t=new Test(args);
System.out.println("优秀="+t.a);
System.out.println("良好="+t.b);
System.out.println("中等="+t.c);
System.out.println("及格="+t.d);
System.out.println("不及格="+t.e);
System.out.println("平均分="+t.average);
}
}