假设复数的数据类型定义为： typedef struct { float realpart； float imagpart； }complex； 试写出求两个复数z1、z2的积的操作算法。用c语言 void mul( complex z1, complex z2, complex & z )

void mul(complex z1, complex z2, complex &z) {
    float C1 = (z1.realpart + z1.imagpart) * z2.realpart;
    float C2 = (z2.realpart + z2.imagpart) * z1.imagpart;
    float C3 = (z1.imagpart - z1.realpart) * z2.imagpart;
    z.realpart = C1 - C2;
    z.imagpart = C3 + C1 - C2;
}