1、已確定學生人數，輸入學生成績，求平均成績

程式碼為：

import java.util.Scanner;

public class clock {
	private static Scanner sc;

	public static void main(String[] args) {
		double grade=0;
		double averagegrade=0;
		sc = new Scanner(System.in);
		for(int i=0;i<5;i++) {	
		grade=sc.nextDouble();	
	averagegrade=averagegrade+grade;
		}
		averagegrade=averagegrade/5;
		System.out.println("平均成績 ："+averagegrade);
}
}