java成绩录入代码 用java编写成绩

如何用Java实现“学生成绩输入”问题？

import java.util.Scanner;

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public class Student{

public static void main(String[] args){

Scanner sc = new Scanner(System.in);

System.out.println("请输入学生的人数....");

int num = sc.nextInt();

int[] arr = new int[num];

double[] chengji_arr = new double[num]; //存放成绩的

String[] String_arr = new String[num]; //存放姓名的

String chengjis = "";

String names = "";

for(int i = 0; i arr.length i String_arr.length i chengji_arr.length; i++){

arr[i] = i;

int s = 0;

Students st = new Students();

System.out.println("请输入第"+(arr[i]+1)+"个学生的序号！");

st.setId(sc.nextInt());

System.out.println("请输入第"+(arr[i]+1)+"个学生的姓名！");

st.setName(sc.next());

System.out.println("请输入第"+(arr[i]+1)+"个学生的成绩！");

st.setChengji(sc.nextDouble());

String_arr[i] = st.getName(); //保存成绩

chengji_arr[i] = st.getChengji();

}

int max = 0;

int tmp = 0;

for (int i = 0; i chengji_arr.length; i++) {

max = i;

for (int j = i + 1; j chengji_arr.length; j++) {

if (chengji_arr[max] chengji_arr[j])

max = j;// 记下较大数位置，再次比较，直到最大

}

if (i != max) {

tmp = (int)chengji_arr[i];

chengji_arr[i] = chengji_arr[max];

chengji_arr[max] = tmp;

}

}

for (int i = 0; i chengji_arr.length; i++)

System.out.print("成绩为："+chengji_arr[i] + " ");

}

}

class Students{

private int id;

private String name;

private double chengji;

public void setId(int id){

this.id = id;

}

public int getId(){

return id;

}

public void setName(String name){

this.name = name;

}

public String getName(){

return name;

}

public void setChengji(double chengji){

this.chengji = chengji;

}

public double getChengji(){

return chengji;

}

}

//代码没有交换学生数组下标，麻烦提问者再修改一下吧，真的要睡了，明天继续上班，抱歉，只能帮你到这里了。

急！急1急！用java编写简单的学生成绩录入程序

这里有一个类

实现学生学号，数学，语文，英语成绩录入

并且计算平均成绩，按照平均成绩高低输出信息

你可以改改！

//实现简单的学生信息输入输出和初步的成绩排序

public

class

student

{

private

int

id;

//学号

private

int

mathscore;

//数学成绩

private

int

chinscore;

//语文成绩

private

int

forescore;

//外语成绩

public

student()

{

id

=

0;

mathscore

=

0;

chinscore

=

0;

forescore

=

0;

}

public

student(int

newid,

int

newmathscore,

int

newchinsvore,

int

newforescore)

{

id

=

newid;

mathscore

=

newmathscore;

chinscore

=

newchinsvore;

forescore

=

newforescore;

}

public

double

getaveragescore()

{

//求平均成绩

double

averagescore

=

((double)

mathscore

+

chinscore

+

forescore)

/

3;

return

averagescore;

}

public

void

output(student

student)

{

//输出对象的内容

system.out.println("

"

+

student.id

+

"

"

+

student.mathscore

+

"

"

+

student.chinscore

+

"

"

+

student.forescore

+

"

"

+

student.getaveragescore());

}

public

int

max(student

a[],

int

n)

{

//student类对象数组的前n项中的成绩最大值的索引

int

position

=

0;

for

(int

i

=

1;

i

n;

i++)

{

if

(a[i].getaveragescore()

a[position].getaveragescore())

{

//比较平均成绩

position

=

i;

}

}

return

position;

}

public

void

selectsort(student

a[])

{

//student类对象数组的选择排序

for

(int

n

=

a.length;

n

1;

n--)

{

int

i

=

max(a,

n);

student

temp

=

a[i];

a[i]

=

a[n

-

1];

a[n

-

1]

=

temp;

}

}

}

java用for循环录入某学生五门课程的成绩并计算平均分，如果分数为负，停止录入并提示错误。

import java.util.Scanner;

public class demo16 {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

//循环录入某学生5门课的成绩并计算平均分。如果某分数录入为负，停止录入并提示录入错误 //循环录入成绩，判断录入正确性。录入错误，使用break语句立刻跳出循环；否则，累加求和

double sum=0,score;

Scanner sc = new Scanner(System.in);

System.out.println("请输入学生姓名：");

String name = sc.next();

for (int i = 1; i = 5; i++) {

System.out.println("请输入第" + i + "门课的成绩");

score=sc.nextDouble();

sum += score;

// double score = sc.nextDouble();

if (score 0) {

System.out.println("抱歉，分数录入错误，请重新进行录入");

break;

}

}

System.out.println("平均分为：" + sum / 5);

}

}