# C++ 程序：使用遞歸計算冪 > 原文： [https://www.programiz.com/cpp-programming/examples/power-recursion](https://www.programiz.com/cpp-programming/examples/power-recursion) #### 該程序使用遞歸來計算數字的冪，其中用戶輸入了底數和指數。 要理解此示例，您應該了解以下 [C++ 編程](/cpp-programming "C++ tutorial")主題： * [C++ 函數](/cpp-programming/function) * [C++ 中用戶定義函數的類型](/cpp-programming/user-defined-function-types) * [C++ 遞歸](/cpp-programming/recursion) * * * * * * ## 示例：使用遞歸編程 ```cpp #include <iostream> using namespace std; int calculatePower(int, int); int main() { int base, powerRaised, result; cout << "Enter base number: "; cin >> base; cout << "Enter power number(positive integer): "; cin >> powerRaised; result = calculatePower(base, powerRaised); cout << base << "^" << powerRaised << " = " << result; return 0; } int calculatePower(int base, int powerRaised) { if (powerRaised != 0) return (base*calculatePower(base, powerRaised-1)); else return 1; } ``` **輸出** ```cpp Enter base number: 3 Enter power number(positive integer): 4 3^4 = 81 ``` 僅當指數為正整數時，此技術才能計算功效。 要查找任意數量的冪，可以使用`pow()`函數。 ```cpp result = pow(base, exponent); ```