这个程序是怎么写的啊

struct complex cadd(struct complex real1,struct complex cim){
    cadd.real=real1.real+cim.real;
    cadd.im=real1.im+cim.im;
    return cadd;
}
struct complex cmult(struct complex real1,struct complex cim){
    cadd.real=real1.real*cim.real;
    cadd.im=real1.im*cim.im;
    return cmult;
}