How to implement the power function in C language

小老鼠
Release: 2024-05-09 23:33:20
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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.

How to implement the power function in C language

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:

<code class="c">#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;
}</code>
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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:

<code class="c">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);
  }
}</code>
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Iteration method

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

Example:

<code class="c">int my_pow_iterative(int base, int exponent) {
  int result = 1;
  int i;
  for (i = 0; i < exponent; i++) {
    result *= base;
  }
  return result;
}</code>
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