[혼공자] 2주차. Chapter 04 ~ 05

기본숙제(필수): p.142 직접 해보는 손코딩(switch문) 실행 후 결과 화면 캡쳐하기

추가 숙제(선택): p.202 05-2 확인 문제 6번 풀고 정리하기

package sec02.verify.exam06;

import java.util.Scanner;

public class Exam06 {
	public static void main(String[] args) {
		boolean run = true;
		int studentNum = 0;
		int[] scores = null;
		Scanner scanner = 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> ");
			
			int selectNo = Integer.parseInt(scanner.nextLine());
			
			if(selectNo == 1) {
				System.out.print("학생수> ");
				studentNum = Integer.parseInt(scanner.nextLine());
				scores = new int[studentNum];
			} else if(selectNo == 2) {
				if(checkStudentNum(studentNum)) continue;

				for (int i = 0; i < scores.length; i++) {
					System.out.print("scores[" + i + "]> ");
					scores[i] = Integer.parseInt(scanner.nextLine());
				}
			} else if(selectNo == 3) {
				if(checkStudentNum(studentNum)) continue;

				for (int i = 0; i < scores.length; i++) {
					System.out.println("scores[" + i + "]: " + scores[i]);
				}			
			} else if(selectNo == 4) {
				if(checkStudentNum(studentNum))	continue;

				int max = 0;
				int sum = 0;
				
				for (int i = 0; i < scores.length; i++) {
					max = (max < scores[i]) ? scores[i] : max;
					sum += scores[i];
				}
				
				System.out.println("최고 점수: " + max);
				System.out.println("평균 점수: " + sum / studentNum);
			} else if(selectNo == 5) {
				run = false;
			}
		}
		
		System.out.println("프로그램 종료");
	}
	
	public static boolean checkStudentNum(int studentNum) {
		if(studentNum == 0) {
			System.out.println("학생수를 입력하세요.");
			return true;
		}
		return false;
	}
}