C++でn乗を表現する方法

<code class="cpp">#include <cmath>

int main() {
  double base = 2;
  int exponent = 3;
  double result = pow(base, exponent);  // result 为 8
  return 0;
}</code>

<code class="cpp">#include <iostream>

class Power {
public:
  double operator()(double base, int exponent) {
    double result = 1;
    for (int i = 0; i < exponent; i++) {
      result *= base;
    }
    return result;
  }
};

int main() {
  Power power;
  double base = 2;
  int exponent = 3;
  double result = power(base, exponent);  // result 为 8
  std::cout << result << std::endl;
  return 0;
}</code>

<code class="cpp">int main() {
  double base = 2;
  int exponent = 3;
  double result = base ^ exponent;  // result 为 8
  return 0;
}</code>