Question

java编程：输入某个班学生的成绩，输入-1时，表示输入结束。计算该班的学生人数、最高分、最低分和平均分

Answer 1

import java.util.Arrays;

import java.util.Scanner;

public class test {

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

int[] arr= {};

int count=0;

int score=0;

while(true){

System.out.println("请输入分数(-1即结束):");

score=sc.nextInt();

if(score==-1) {

break;

}

count++;

arr=Arrays.copyOf(arr, arr.length+1);

arr[count-1]=score;

}

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

for(int j=0;j<arr.length-1-i;j++) {

if(arr[j]>arr[j+1]) {

int tmp=arr[j];

arr[j]=arr[j+1];

arr[j+1]=tmp;

}

}

}

if(count==0) {

System.out.println("您没有输入成绩");

}

else {

System.out.println("总人数:"+count)

System.out.println("最高分数:"+arr[arr.length-1]));

System.out.println("最低分数:"+arr[0]);

double avg=0;

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

avg+=arr[i];

}

System.out.println("平均分:"+avg/arr.length);

}

}

}

Answer 2

package practice;

import java.util.Scanner;

/**
* Created by ClintXiao on 2017/8/1.
*/
public class Test3 {
public static void main(String args[]) {
double core;
double maxCore = 0;
double minCore = 100;
int count = 0;
double sumCore = 0;
Scanner scanner = new Scanner(System.in);
int isFirst = 1;
while (true) {
System.out.println("请输入学生成绩（输入-1退出）");
core = scanner.nextDouble();
if (core == -1) break;
if (core > 100 || core< 0){
System.out.println("请输入0-100分成绩");
continue;
}
count++;
sumCore += core;
if(isFirst == 1){
minCore = core;
maxCore = core;
isFirst =0;
}
if (core < minCore) minCore = core;
if (core > maxCore) maxCore = core;
}
if(isFirst == 1){
System.out.println("未输入任何学生成绩");
}else{
System.out.println("最高成绩："+maxCore);
System.out.println("最低成绩："+minCore);
System.out.println("平均分："+sumCore/count);
}
}
}

纯手打，我帮你全部情况都考虑进来了，采纳我吧~~

Answer 3

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class texts {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc =new Scanner(System.in);
System.out.println("班级:1125班");
List<Integer> list =new ArrayList<Integer>();
while(true){
System.out.println("输入学生成绩");
int Fraction=sc.nextInt();
if(Fraction==-1){
break;
}else{
list.add(Fraction);
}
}
int sum=0;
for (Integer integer : list) {
sum+=integer;
}
System.out.println("1125班人数为:"+list.size()+"人,其中最高分为:"+Collections.max(list)+",最低分数为:"+Collections.min(list)+",平均分为:"+sum/list.size()+"。");
}

}

Answer 4

import java.util.Scanner;

public class Demo {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int count = 0;
		int max=Integer.MIN_VALUE;
		int min=Integer.MAX_VALUE;
		
		int sum =0;
		int tmp;
		while(( tmp =scan.nextInt()) != -1){
			count += 1;
			sum += tmp;
			if(tmp>max)
				max=tmp;
			if(tmp<min)
				min=tmp;
		}
		System.out.println("学生人数： "+count+", 最高分: "+max+", 最低分： "+min+", 平均分: "+(double)sum/count);
	}
}

追问

1/1-1/3+1/5-1/7+1/9-…+1/99 这个怎么做？

追答

给一道题的分，让做两道题啊

Answer 5

不难，怎么感谢