#include <stdio.h>

void cadd(double a, double b, double c, double d, double *x, double *y){
	*x=a+c;
	*y=b+d;
}
void csub(double a, double b, double c, double d, double *x, double *y){
	*x=a-c;
	*y=b-d;
}
void cmul(double a, double b, double c, double d, double *x, double *y){
	*x = a * c - b * d;
	*y = a * d + c * b;
}
void cdiv(double a, double b, double c, double d, double *x, double *y){
	*x = (a * c + b * d) / (c * c + d * d);
	*y = (b * c - a * d) / (c * c + d * d);
}

int main(void){

	double a, b, c, d, x, y;

	printf("Input a+bi\n");
	printf("a:");
	scanf("%lf", &a);
	printf("b:");
	scanf("%lf", &b);
	printf("Input c+di\n");
	printf("c:");
	scanf("%lf", &c);
	printf("d:");
	scanf("%lf", &d);

	cadd(a, b, c, d, &x, &y);
	printf("(a+bi)+(c+di)=%f+%fi\n", x, y);

	csub(a, b, c, d, &x, &y);
	printf("(a+bi)-(c+di)=%f+%fi\n", x, y);

	cmul(a, b, c, d, &x, &y);
	printf("(a+bi)(c+di)=%f+%fi\n", x, y);

	cdiv(a, b, c, d, &x, &y);
	printf("(a+bi)/(c+di)=%f+%fi\n", x, y);
	return 0;
}