배열 실습_점수 분석 프로그램

package ch05.sec12;

import java.util.Scanner;

public class Exam09 {

	public static void main(String[] args) {
		int [] students = null;
		boolean run=true;
		Scanner sca=new Scanner(System.in);
		
		while(run) {
		System.out.println("----------------------------------------------------");
		System.out.println(" 1. 학생수 | 2.점수입력 | 3.점수리스트 | 4.분석 | 5.종료");
		System.out.println("----------------------------------------------------");
		System.out.print("선택> ");
		String strNum1=sca.nextLine();
		int num=Integer.parseInt(strNum1);
		
		switch (num) {
			case 1:
				System.out.print("학생 수를 입력 : ");
				String strNum2=sca.nextLine();
				int i=Integer.parseInt(strNum2);
				students=new int[i];
			break;
			case 2:
				for(int j=0;j<students.length;j++) {
					System.out.print("점수를 입력 (학생"+(j+1)+"번) : ");
					String strNum3=sca.nextLine();
					int score=Integer.parseInt(strNum3);
					students[j]=score;
				}
				break;
			case 3:
				for(int k=0;k<students.length;k++) {
					System.out.println("학생"+(k+1)+"번 점수 : "+students[k]);
				}
				break;
			case 4:
				int max=0;
				for(int l=0;l<students.length;l++) {
					if(max<students[l]) {
						max=students[l];
					}
				}
				System.out.println("높은 점수: "+max);
				int sum=0;
				for(int m=0;m<students.length;m++) {
					sum += students[m];
				}
				System.out.println("총 학생 평균 :"+((double)sum/students.length));
				break;
			case 5:
				run=false;
				System.out.print("프로그램 종료");
				break;
			}
		}
		sca.close();
	}
}