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                # C++ 程序:通過創建函數來檢查質數 > 原文: [https://www.programiz.com/cpp-programming/examples/prime-function](https://www.programiz.com/cpp-programming/examples/prime-function) #### 您將通過將數字傳遞給用戶定義的函數來學習檢查用戶輸入的數字是否為質數。 要理解此示例,您應該了解以下 [C++ 編程](/cpp-programming "C++ tutorial")主題: * [C++ `for`循環](/cpp-programming/for-loop) * [C++ `if`,`if...else`和嵌套`if...else`](/cpp-programming/if-else) * [C++ `break`和`continue`語句](/cpp-programming/break-continue) * [C++ 函數](/cpp-programming/function) * [C++ 中用戶定義函數的類型](/cpp-programming/user-defined-function-types) * * * * * * ## 示例:檢查質數 ```cpp #include <iostream> using namespace std; int checkPrimeNumber(int); int main() { int n; cout << "Enter a positive integer: "; cin >> n; if(checkPrimeNumber(n) == 0) cout << n << " is a prime number."; else cout << n << " is not a prime number."; return 0; } int checkPrimeNumber(int n) { bool flag = false; for(int i = 2; i <= n/2; ++i) { if(n%i == 0) { flag = true; break; } } return flag; } ``` **輸出** ```cpp Enter a positive integer: 23 23 is a prime number. ``` 在此示例中,用戶輸入的數字將傳遞到`checkPrimeNumber()`函數。 如果傳遞給該函數的數字是質數,則此函數返回`true`;如果傳遞給該函數的數字不是質數,則該函數返回`false`。 最后,從`main()`函數中打印適當的消息
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