賦值

package hello;

import java.util.Scanner;

public class Hello {

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("你好");
Scanner in = new Scanner(System.in);
// System.out.println("100-23="+(100-in.nextInt()));
final int amount = 100;
int price = 0;
System.out.println(price);
price = in.nextInt();
System.out.println(amount+"-"+price+"="+(amount-price));
}

}

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final int amount ：定義常量，是值不以值的面目出現。

package hello;

import java.util.Scanner;

public class Hello {

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("你好");
Scanner in = new Scanner(System.in);
// System.out.println("100-23="+(100-in.nextInt()));
int amount = 100;
int price = 0;
System.out.print("請輸入票面：");
amount = in.nextInt();
System.out.print("請輸入金額：");
price = in.nextInt();
System.out.println(amount+"-"+price+"="+(amount-price));
}

}

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System.out.print("請輸入票面："); ：加入一些輸出，界面更友好。