【程式語言】JAVA的第五堂課 ｜在陣列中取平均溫度、最大溫度、最小溫度、各日平均

public class ch6_8 {
    public static void main(String[] args) {
        double[][] num = {{18.2,17.3,15.0,13.4},
                          {23.8,25.1,20.6,17.8},
                          {20.6,21.5,18.4,15.7}};
        double temp[] =  new double[3];
        double sum = 0.00; 
        String[] day = {"時段一","時段二","時段三"};

        System.out.println("\t星期一\t星期二\t星期三\t星期四");

        for (int i = 0 ; i < num.length ; i++) {
            System.out.print(day[i] + "\t");
            for (int j = 0 ; j < num[1].length ; j++) {
                System.out.print(num[i][j] + "\t" );
            }
            System.out.println();
        }



        System.out.println();
        for (int i = 0 ; i < num.length ; i++) { // 印出平均溫度
            System.out.print(day[i]);
            for (int j = 0 ; j < num[1].length ; j++) {
                sum += num[i][j];
            }
            temp[i] += sum;
            System.out.printf(" 的平均溫度為：%.2f \n" , (sum/num[1].length));
            sum = 0;
        }
        System.out.println();

        float total = 0;

        for (int i = 0 ; i < num.length-1 ; i++) { // 印出各時段平均溫度
            for (int j = 0 ; j < num[1].length-1 ; j++) {
                total += num[j][i];
            }
            System.out.printf(day[i] + "\t %.2f \n" ,(total/num.length));
        }

        double max = num[0][0] ;
        double min = num[0][0]; 
        int index = 0;

        for (int i = 0 ; i < num.length ; i++) { // 印出平均溫度
            for (int j = 0 ; j < num[1].length ; j++) {
                if (num[i][j] > max) {
                    index = i;
                    max = num[i][j];
                }
                else {
                    index = i;
                    min =  num[i][j];
                }
            }
        }
        System.out.println();
        System.out.println(day[index-1] + "\t" + max);
        System.out.println(day[index-1] + "\t" + min);

        }
}

Result: