double res_real,res_img;
void complex_add(double re,double im,double re2,double im2){
res_real = re+re2;
res_img = im + im2;
}
void complex_prod(double re1,double img1,double re2,double img2){
res_real = re1 * re2 - img1*img2;
res_img = re1*img2 + re2*img1;
}
int main(){
double img1,img2,rel1,rel2;
//im是虚部,rel是实部
scanf("%lf%lf",&img1,&rel1);
scanf("%lf%lf",&rel2,&img2);
complex_add(rel1,img1,rel2,img2);
printf("相加%.3f,%.3f",res_real,res_img) ;
complex_prod(rel1,img1,rel2,img2);
printf("相乘 %.3f,%.3f",res_real,res_img) ;
}