c 语言 复数基本运算主函数

在C语言中，处理复数的基本运算通常涉及到结构体来表示复数，包含实部和虚部两个成员。这里我们可以创建一个简单的主函数来演示复数的加减乘除运算。首先，我们需要定义一个复数结构体：

#include <stdio.h>
typedef struct {
    double real;   // 实部
    double imag;   // 虚部
} complex;

接下来，我们定义一些基本运算的函数：

// 加法
complex add(complex a, complex b) {
    complex result = {a.real + b.real, a.imag + b.imag};
    return result;
}

// 减法
complex subtract(complex a, complex b) {
    complex result = {a.real - b.real, a.imag - b.imag};
    return result;
}

// 乘法
complex multiply(complex a, complex b) {
    double real = a.real * b.real - a.imag * b.imag;
    double imag = a.real * b.imag + a.imag * b.real;
    complex result = {real, imag};
    return result;
}

// 除法
complex divide(complex a, complex b) {
    if (b.real == 0 && b.imag == 0) {
        printf("Error: Division by zero is not allowed.\n");
        return (complex){NaN, NaN}; // 返回不是一个具体的值，表示未定义
    }
    double denominator = b.real * b.real + b.imag * b.imag;
    double real = (a.real * b.real + a.imag * b.imag) / denominator;
    double imag = (a.imag * b.real - a.real * b.imag) / denominator;
    complex result = {real, imag};
    return result;
}

然后，在主函数中，你可以创建复数并测试这些操作：

int main() {
    complex num1 = {3, 4};  // 示例复数
    complex num2 = {1, -2};

    complex sum = add(num1, num2);
    complex diff = subtract(num1, num2);
    complex prod = multiply(num1, num2);
    complex quot = divide(num1, num2);

    printf("Sum: %f + i%f\n", sum.real, sum.imag);
    printf("Difference: %f + i%f\n", diff.real, diff.imag);
    printf("Product: %f + i%f\n", prod.real, prod.imag);
    printf("Quotient: %f + i%f\n", quot.real, quot.imag);

    return 0;
}