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為什麼要用到陣列及遍歷陣列和數組裡資料的查詢方法

public static void main(String[] args) {    Scanner sc=new Scanner(System.in);    System.out.println("輸入五個整數");    int num = sc.nextInt();    int num1 = sc.nextInt();    int num2 = sc.nextInt();    int num3 = sc.nextInt();    int num4 = sc.nextInt();    double num5 = (num+num1+num2+num3+num4)/5;  // 五個數的平均值
      double vari = 0;      vari += (num-num5)*(num-num5);      vari += (num1-num5)*(num1-num5);      vari += (num2-num5)*(num2-num5);      vari += (num3-num5)*(num3-num5);      vari += (num4-num5)*(num4-num5);      vari =vari/5;    System.out.println(vari);