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                # Java 程序:檢查一個數字是否可以表示為兩個質數之和 > 原文: [https://www.programiz.com/java-programming/examples/sum-prime-numbers](https://www.programiz.com/java-programming/examples/sum-prime-numbers) #### 在該程序中,您將學習檢查給定的數字是否可以表示為兩個質數之和。 這是借助 Java 中的循環和`break`語句完成的。 為了完成此任務,創建了`checkPrime()`函數。 如果傳遞給函數的數字是[質數](/java-programming/examples/prime-number "Check prime number in Java programming"),則`checkPrime()`返回 1。 ## 示例:作為兩個質數之和的整數 ```java public class CheckPrime { public static void main(String[] args) { int number = 34; boolean flag = false; for (int i = 2; i <= number / 2; ++i) { // condition for i to be a prime number if (checkPrime(i)) { // condition for n-i to be a prime number if (checkPrime(number - i)) { // n = primeNumber1 + primeNumber2 System.out.printf("%d = %d + %d\n", number, i, number - i); flag = true; } } } if (!flag) System.out.println(number + " cannot be expressed as the sum of two prime numbers."); } // Function to check prime number static boolean checkPrime(int num) { boolean isPrime = true; for (int i = 2; i <= num / 2; ++i) { if (num % i == 0) { isPrime = false; break; } } return isPrime; } } ``` 運行該程序時,輸出為: ```java 34 = 3 + 31 34 = 5 + 29 34 = 11 + 23 34 = 17 + 17 ```
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