ex09_2.java(성적분석 모의실험)

import java.util.Random;

public class ex09_3 {
	public static void main(String[] args) {
		Random rand = new Random();
		int[] count = new int[11];
		int sum = 0;
		
		System.out.printf("score[]: \n");
		for(int i=0; i<300; i++) {
			int score = rand.nextInt(101);
			System.out.print(" " + score);
			if((i+1)%10 == 0) {
				System.out.println();
			}
			sum += score;
			count[score/10]++;
		}
		int totalCount = 0;
		for(int i=0; i<=10; i++) {
			totalCount += count[i];
		}
		double average = (double)sum/totalCount;
		System.out.printf("\nAverage: %.2f\n", average);
		
		for(int i=0; i<9; i++) {
			System.out.printf("%3d - %3d: ", i*10,i*10+9);
			for(int j=0; j<count[i]; j++) {
				System.out.printf("*");
			}
			System.out.print(" "+count[i]);
			System.out.println();
	}
		System.out.printf("%9d: ", 100);
		for(int j=0; j<count[10]; j++) {
			System.out.printf("*");
		}
		System.out.print(" "+count[10]);
		System.out.println();
	}
}