student.txt

输入学生姓名

import java.util.Scanner;
public class student {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner = new Scanner(System.in);
		
		System.out.println("请输入学生人数:");
		int length = scanner.nextInt();
		int[] number =new int[length];  //动态分配数组
		String[] name = new String[length];
		float[] score = new float[length];
		float a=0,b=0,c=0,d=0;
		
		for(int j=0;j<score.length;j++)
		   {
			System.out.println("请输入学号：");
			int input1= scanner.nextInt();
			number[j] = input1;
			System.out.println("请输入姓名：");
		        String input2= scanner.next();
			name[j] = input2;
			System.out.println("请输入分数：");
			float input3= scanner.nextFloat();
			score[j] = input3;
			if(score[j]>=90)
				a+=1;
			else if(score[j]>=80)
				b+=1;
			else if(score[j]>=60)
				c+=1;
			else if(score[j]<60)
				d+=1;
            }
		System.out.println("学号 姓名  分数");
		float total = 0;
		for(int i=0;i<score.length;i++)
		{
			total +=score[i];
			System.out.println(number[i]+"   "+name[i]+"  "+score[i]);
		}
		System.out.println("优秀率："+a/score.length);
		System.out.println("良好率："+b/score.length);
		System.out.println("及格率："+(a+b+c)/score.length);
		System.out.println("不及格率："+d/score.length);
		System.out.println("平均成绩:"+total/score.length);
	}
		 
}