/* Cau truc va cac ham thao tac len so phuc */

#include <math.h>

typedef struct tagcomplex {

  float thuc, ao;

} complex;

complex tong(complex a, complex b)

{

  complex c;

  c.thuc = a.thuc + b.thuc;

  c.ao   = a.ao + b.ao;

  return c;

}

complex hieu(complex a, complex b)

{

  complex c;

  c.thuc = a.thuc - b.thuc;

  c.ao   = a.ao - b.ao;

  return c;

}

complex tich(complex a, complex b)

{

  complex c;

  c.thuc = a.thuc*b.thuc - a.ao*b.ao;

  c.ao   = a.thuc*b.ao + a.ao*b.thuc;

  return c;

}

complex thuong(complex a, complex b)

{

  complex c;

  float tongbp;

  tongbp = b.thuc*b.thuc + b.ao*b.ao;

  c.thuc = (a.thuc*a.ao + b.thuc*b.ao)/tongbp;

  c.ao   = (a.ao*b.thuc - a.thuc*b.ao)/tongbp;

  return c;

}

float argument(complex a)

{

  return acos(a.thuc/sqrt(a.thuc*a.thuc + a.ao*a.ao));

}

float modul(complex a)

{

  return sqrt(a.thuc*a.thuc + a.ao*a.ao);

}

void print_complex(complex a)

{

  printf("%.2f + %.2fi", a.thuc, a.ao);

}

void main()

{

  complex a, b, c;

  printf("

Nhap he so thuc va phuc cua A : ");

  scanf("%f%f", &a.thuc, &a.ao);

  printf("

Nhap he so thuc va phuc cua B : ");

  scanf("%f%f", &b.thuc, &b.ao);

  printf("

So phuc A = ");

  print_complex(a);

  printf("

So phuc B = ");

  print_complex(b);

  printf("

Tong cua chung = ");

  c = tong(a, b);

  print_complex(c);

  printf("

Hieu cua chung = ");

  c = hieu(a, b);

  print_complex(c);

  printf("

Tich cua chung = ");

  c = tich(a, b);

  print_complex(c);

  printf("

Thuong cua chung = ");

  c = thuong(a, b);

  print_complex(c);

  printf("

Argument cua a = %f", argument(a));

  printf("

Modul cua a = %f", modul(a));

  getch();

}