用C语言写出完整代码(2)定义一个复数结构体Complex,包含实部real和虚部imaginary两个成员变量(均为double型)。定义函数void print complex(struct Complex x),用于以a+bi的形式输出复数。定义一个函数struct Complex complex_ sub(truct Complex x, struct Complexy),计算两个复数的差x- y.完成整个程序，令x-2+Si, y-3+7i, 输出x、y以及x-y的计算结果。

#include <stdio.h>

typedef struct {
    double real;       // 实部
    double imaginary;  // 虚部
} Complex;

// 以a+bi的形式输出复数
void print_complex(Complex x) {
    printf("%.2f + %.2fi", x.real, x.imaginary);
}

// 计算两个复数的差x - y
Complex complex_sub(Complex x, Complex y) {
    Complex diff;
    diff.real = x.real - y.real;
    diff.imaginary = x.imaginary - y.imaginary;
    return diff;
}

int main() {
    // 定义两个复数
    Complex x = {2, 5};
    Complex y = {3, 7};

    // 输出x和y
    printf("x = ");
    print_complex(x);
    printf("\ny = ");
    print_complex(y);
    printf("\n");

    // 计算x - y
    Complex diff = complex_sub(x, y);

    // 输出x - y
    printf("x - y = ");
    print_complex(diff);
    printf("\n");

    return 0;
}