Learn how to perform exponentiation operations in C language

To learn the power calculation method in C language, specific code examples are required

When performing mathematical operations, finding the power of a number is a very common operation. In C language, we can use loop or recursion to implement exponentiation calculation. Two commonly used methods will be introduced below and specific code examples will be given.

1. Loop method

The loop method is a common method to implement exponentiation. The principle is to multiply the base number by itself multiple times to obtain the result through cyclic cumulative multiplication.

Code example:

#include <stdio.h>

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

int main() {
    double base;
    int exponent;
    
    printf("请输入底数和指数：");
    scanf("%lf %d", &base, &exponent);
    
    double result = power(base, exponent);
    
    printf("结果为：%.2lf
", result);
    
    return 0;
}

2. Recursive method

The recursive method is another common method to implement exponentiation. The principle is to recursively decompose the exponentiation problem into smaller-scale exponentiation problems until the exponent is 0 and the result is 1, otherwise it calls itself recursively for calculation.

Code example:

#include <stdio.h>

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

int main() {
    double base;
    int exponent;
    
    printf("请输入底数和指数：");
    scanf("%lf %d", &base, &exponent);
    
    double result = power(base, exponent);
    
    printf("结果为：%.2lf
", result);
    
    return 0;
}

Through the above two methods, we can flexibly calculate powers. The round-robin method is suitable for cases where the exponent is small, while the recursive method is suitable for cases where the exponent is large and the recursion depth is acceptable. According to actual needs, we can choose a suitable method for exponentiation calculation.

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