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                # Java 程序:用于檢查數字是正還是負 > 原文: [https://beginnersbook.com/2017/09/java-program-to-check-if-number-is-positive-or-negative/](https://beginnersbook.com/2017/09/java-program-to-check-if-number-is-positive-or-negative/) 在這篇文章中,我們將編寫兩個 java 程序,第一個 java 程序檢查指定的數字是正數還是負數。第二個程序獲取輸入數字(由用戶輸入)并檢查它是正數還是負數并顯示結果。 →如果一個數字大于零,那么它是一個正數 →如果一個數字小于零那么它是一個負數 →如果一個數字等于零則它既不是負數也不是整數。 讓我們在 Java 程序中編寫這個邏輯。 ## 示例 1:檢查給定數字是正數還是負數 在此程序中,我們在聲明期間指定了數字的值,程序檢查指定的數字是正數還是負數。要理解這個程序,你應該具備[核心 Java 編程](https://beginnersbook.com/2017/08/if-else-statement-in-java/)中[`if-else-if`語句](https://beginnersbook.com/2017/08/if-else-statement-in-java/)的基本知識。 ```java public class Demo { public static void main(String[] args) { int number=109; if(number > 0) { System.out.println(number+" is a positive number"); } else if(number < 0) { System.out.println(number+" is a negative number"); } else { System.out.println(number+" is neither positive nor negative"); } } } ``` **輸出:** ```java 109 is a positive number ``` ## 示例 2:檢查輸入數字(由用戶輸入)是正數還是負數 這里我們使用`Scanner`來[讀取用戶](https://beginnersbook.com/2017/09/java-program-to-read-integer-value-from-the-standard-input/)輸入的數字,然后程序檢查并顯示結果。 ```java import java.util.Scanner; public class Demo { public static void main(String[] args) { int number; Scanner scan = new Scanner(System.in); System.out.print("Enter the number you want to check:"); number = scan.nextInt(); scan.close(); if(number > 0) { System.out.println(number+" is positive number"); } else if(number < 0) { System.out.println(number+" is negative number"); } else { System.out.println(number+" is neither positive nor negative"); } } } ``` **輸出:** ```java Enter the number you want to check:-12 -12 is negative number ``` #### 試試這些相關的程序 1. [Java 程序:相加兩個數字](https://beginnersbook.com/2017/09/java-program-to-add-two-numbers/) 2. [Java 程序:乘以兩個數字](https://beginnersbook.com/2017/09/java-program-to-multiply-two-numbers/) 3. [Java 程序:從標準輸入讀取數字](https://beginnersbook.com/2017/09/java-program-to-read-integer-value-from-the-standard-input/)
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