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                # C++ 程序:顯示數字的因數 > 原文: [https://www.programiz.com/cpp-programming/examples/factors-number](https://www.programiz.com/cpp-programming/examples/factors-number) #### 使用`for`循環和`if`語句查找整數(由用戶輸入)的所有因數的示例。 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) * * * 該程序從用戶處獲取一個正整數,并顯示該數字的所有因數。 * * * ## 示例:顯示數字的所有因數 ```cpp #include <iostream> using namespace std; int main() { int n, i; cout << "Enter a positive integer: "; cin >> n; cout << "Factors of " << n << " are: " << endl; for(i = 1; i <= n; ++i) { if(n % i == 0) cout << i << endl; } return 0; } ``` **輸出** ```cpp Enter a positive integer: 60 Factors of 60 are: 1 2 3 4 5 6 12 15 20 30 60 ``` 在該程序中,用戶輸入的整數存儲在變量`n`中。 然后,以初始條件`i = 1`執行`for`循環,并檢查`n`是否可被`i`完全整除。 如果`n`可被`i`完全整除,則`i`將是`n`的因數。 在每次迭代中,`i`的值都會更新(增加 1)。 該過程一直進行到測試條件`i <= n`變為假,即該程序檢查用戶`n`輸入的數字是否可以從 1 到`n`的所有數字中完全除盡,并且顯示該數字的所有因數。
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