Java Basic(7)-建立一個簡單的計算加法

import java.util.Scanner;

class apples{

public static void main(String args[]){

Scanner bucky = new Scanner(System.in);

double fnum,snum,answer;

System.out.println("Enter first num: ");

fnum = bucky.nextDouble();

System.out.println("Enter second num: ");

snum = bucky.nextDouble();

answer = fnum + snum;

System.out.println(answer);

}

}

double fnum,snum,answer; -->變量的類型和名稱

fnum = bucky.nextDouble(); -->意味著你必須把這個變量變成Double類型，
                              否則，它會錯誤。

answer = fnum + snum; -->計算公式

System.out.println(answer); -->打印answer在屏幕上

如果你運行這個程序：

Enter first num:

54.6 Press Enter

Enter second num:

22.8 Press Enter

77.4 答案會顯示出來！！