c语言复数的四则运算

在C语言中，复数的四则运算通常涉及到结构体（struct）的使用，因为C标准库本身并不支持复数直接操作。我们可以创建一个名为`complex`的结构体，包含实部（real）和虚部（imaginary）两个成员，来进行复数的加减乘除。

#include <stdio.h>

typedef struct {
    double real;
    double imag;
} complex;

complex add(complex a, complex b) {
    return (complex) {a.real + b.real, a.imag + b.imag};
}

complex subtract(complex a, complex b) {
    return (complex) {a.real - b.real, a.imag - b.imag};
}

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;
    return (complex) {real, imag};
}

complex divide(complex a, complex b) {
    double denominator = b.real * b.real + b.imag * b.imag;
    if (denominator == 0) {
        printf("Error: Division by zero.\n");
        return (complex){0, 0}; // 或者处理特殊情况
    }
    double real = (a.real * b.real + a.imag * b.imag) / denominator;
    double imag = (a.imag * b.real - a.real * b.imag) / denominator;
    return (complex) {real, imag};
}

int main() {
    complex num1 = {3, 4};
    complex num2 = {5, 6};

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

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

    return 0;
}