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#include <stdio.h>
#include <stdlib.h>
typedef struct
{
float a;
float b;
} COMPLEX;
COMPLEX *comp_add(COMPLEX *a, COMPLEX *b)
{
a->a += b->a;
a->b += b->b;
return a;
}
COMPLEX *comp_substract(COMPLEX *a, COMPLEX *b)
{
a->a -= b->a;
a->b -= b->b;
return a;
}
COMPLEX *comp_multiply(COMPLEX *a, COMPLEX *b)
{
COMPLEX *c = (COMPLEX *)malloc(sizeof(COMPLEX));
c->a = a->a * b->a - a->b * b->b;
c->b = a->b * b->a + a->a * b->b;
*a = *c;
free(c);
return a;
}
COMPLEX *comp_divide(COMPLEX *a, COMPLEX *b)
{
COMPLEX c = *b;
c.b = -c.b;
comp_multiply(a, &c);
comp_multiply(b, &c);
a->a /= b->a;
a->b /= b->a;
return a;
}
int main()
{
COMPLEX a, b;
char opr;
scanf("%c%f%f%f%f", &opr, &a.a, &a.b, &b.a, &b.b);
switch (opr)
{
case '-':
comp_substract(&a, &b);
break;
case '*':
comp_multiply(&a, &b);
break;
case '/':
comp_divide(&a, &b);
break;
default:
case '+':
comp_add(&a, &b);
break;
}
printf("%.2f+%.2fi\n", a.a, a.b);
return 0;
}
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