How to calculate exponentiation in C language

There are many ways to implement exponentiation operations in C language, among which the two most commonly used methods are the loop method and the recursive method. The following will introduce each and give specific code examples.

1. The loop method implements the exponentiation operation

The loop method is a relatively simple and intuitive implementation method. Through the loop, the base number is continuously multiplied, and a higher number of times can be achieved The power of . The specific code is as follows:

#include <stdio.h>

double power(double x, int n) {
    double result = 1.0;
    int i;
    
    if (n >= 0) {
        for (i = 0; i < n; i++) {
            result *= x;
        }
    } else {
        n = -n;
        for (i = 0; i < n; i++) {
            result /= x;
        }
    }
    
    return result;
}

int main() {
    double x;
    int n;
    
    printf("请输入底数：");
    scanf("%lf", &x);
    printf("请输入指数：");
    scanf("%d", &n);
    
    printf("%lf 的 %d 次方等于 %lf
", x, n, power(x, n));
    
    return 0;
}

In the above code, the power function accepts two parameters, namely the base x and the exponent n , returns the result of the n power operation of x. Among them, if n is greater than or equal to 0, multiply x by itself n times through a loop; if n is less than 0, take # The absolute value of ##n, looping through dividing x by itself n times.

Recursive method implements exponentiation operation

#include <stdio.h>

double power(double x, int n) {
    if (n == 0) {
        return 1.0;
    } else if (n > 0) {
        return x * power(x, n - 1);
    } else {
        return 1.0 / power(x, -n);
    }
}

int main() {
    double x;
    int n;
    
    printf("请输入底数：");
    scanf("%lf", &x);
    printf("请输入指数：");
    scanf("%d", &n);
    
    printf("%lf 的 %d 次方等于 %lf
", x, n, power(x, n));
    
    return 0;
}

power function also accepts two parameters, which are the base x and the exponent n, returns the result of the n power operation of x. Among them, when n is equal to 0, 1 is returned; when n is greater than 0, x multiplied by itself to the power of n-1 is returned. The result; when n is less than 0, the result of dividing 1 by x raised to the power of -n is returned.

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