java 實驗一

標籤：

步驟	耗時h	百分比%
需求分析	0.3h	7.5
設計	2.5h	62.5
代碼實現	0.5h	12.5
測試	0,2h	5
分析總結	0.5h	12.5

實驗一

實驗二：

實驗三

實現四則運算

代碼：

import java.util.Scanner;
public class D1_jisuanqi {
public static void main(String[] args){
double x,y,s;
int i;
System.out.println("1是乘法，2是除法，3是加法，4是減法，5是模數");
Scanner sc = new Scanner(System.in);
i = sc.nextInt();
if (i == 1)
{
System.out.println("你將用乘法");
System.out.println("請輸入x,y兩個值：(用空格間隔)");
Scanner c = new Scanner(System.in);
x = c.nextDouble();
y = c.nextDouble();
s = x*y;
System.out.println("x*y的值是："+s);
c.close();
}
else if (i == 2)
{
System.out.println("你將用除法");
System.out.println("請輸入x,y的值：(用空格間隔)");
Scanner d = new Scanner(System.in);
x = d.nextDouble();
y = d.nextDouble();
s = x/y;
System.out.println("x/y的值是："+s);
d.close();
}
else if (i == 3)
{
System.out.println("你將用加法");
System.out.println("請輸入x,y的值：(用空格間隔)");
Scanner e = new Scanner(System.in);
x = e.nextDouble();
y = e.nextDouble();
s = x+y;
System.out.println("x+y的值是："+s);
e.close();
}
else if(i == 4)
{
System.out.println("你將用減法");
System.out.println("請輸入x,y的值：(用空格間隔)");
Scanner f = new Scanner(System.in);
x = f.nextDouble();
y = f.nextDouble();
s = x-y;
System.out.println("x-y的值是："+s);
f.close();
}
else
{
System.out.println("你將用模數");
System.out.println("請輸入x,y的值(用空格間隔)");
Scanner g = new Scanner(System.in);
x = g.nextDouble();
y = g.nextDouble();
s = x%y;
System.out.println("x%y的值是："+s);
g.close();
}
sc.close();
}
}

 

 

 

package ljp;

import java.util.Scanner;

public class Hello {

    public static void main(String[] agrs){

        System.out.println("Input your first name,please:");

        Scanner s =new Scanner(System.in);

        String name = s.next();

        System.out.println("Hello"+name+"!");

    }

java 實驗一