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                # C++ 程序:使用數組計算數字平均值 > 原文: [https://www.programiz.com/cpp-programming/examples/average-arrays](https://www.programiz.com/cpp-programming/examples/average-arrays) #### 該程序從用戶那里獲取 n 個元素(其中 n 由用戶指定),將數據存儲在數組中并計算這些數字的平均值。 要理解此示例,您應該了解以下 [C++ 編程](/cpp-programming "C++ tutorial")主題: * [C++ 數組](/cpp-programming/arrays) * [C++ `for`循環](/cpp-programming/for-loop) * [C++ `while`和`do...while`循環](/cpp-programming/do-while-loop) * * * ## 示例:使用數組計算數字平均值 ```cpp #include <iostream> using namespace std; int main() { int n, i; float num[100], sum=0.0, average; cout << "Enter the numbers of data: "; cin >> n; while (n > 100 || n <= 0) { cout << "Error! number should in range of (1 to 100)." << endl; cout << "Enter the number again: "; cin >> n; } for(i = 0; i < n; ++i) { cout << i + 1 << ". Enter number: "; cin >> num[i]; sum += num[i]; } average = sum / n; cout << "Average = " << average; return 0; } ``` **輸出** ```cpp Enter the numbers of data: 6 1\. Enter number: 45.3 2\. Enter number: 67.5 3\. Enter number: -45.6 4\. Enter number: 20.34 5\. Enter number: 33 6\. Enter number: 45.6 Average = 27.69 ``` 如果數據數從 1 到 100,此程序將計算平均值。 如果用戶輸入的`n`的值大于 100 或小于 100,則執行`while`循環,要求用戶輸入`n`的值,直到它在 1 到 100 之間。 當用戶輸入數字時,隨后計算總和并將其存儲在變量`sum`中。 存儲所有數字后,將計算并顯示`average`。
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