How to implement the power function in C language

In C language, there are two ways to implement exponentiation operation: use the pow() function to calculate the power of the second parameter of the first parameter. Define a custom power function, which can be implemented recursively or iteratively: the recursive method continues to double the power until it is 0. The iterative method uses a loop to multiply the base one by one.

C language exponentiation function implementation

Introduction
In C language , to implement the exponentiation operation you need to use the pow() function or a custom function.

pow() function The

• pow() function is provided by the <math.h> header file.
• It calculates and returns the first parameter raised to the power of the second parameter.
• Syntax: double pow(double base, double exponent);

Example:

#include <math.h>

int main() {
  double base = 2.0;
  double exponent = 3.0;
  double result = pow(base, exponent);
  printf("结果：%.2f\n", result);  // 输出：8.00
  return 0;
}

Customized exponentiation function

You can also define your own exponentiation function, which is achieved through recursion or iteration.

Recursive method

• The function keeps reducing the power by one until it reaches 0.
• Syntax: int my_pow(int base, int exponent);

Example:

int my_pow(int base, int exponent) {
  if (exponent == 0) {
    return 1;
  } else if (exponent > 0) {
    return base * my_pow(base, exponent - 1);
  } else {
    return 1.0 / my_pow(base, -exponent);
  }
}

Iteration method

• The function uses a loop to multiply the base one by one.
• Syntax: int my_pow_iterative(int base, int exponent);

Example:

int my_pow_iterative(int base, int exponent) {
  int result = 1;
  int i;
  for (i = 0; i < exponent; i++) {
    result *= base;
  }
  return result;
}

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