1051 复数乘法 (15 分)

 1 #include <iostream>
 2 #include <cmath> 
 3 using namespace std;
 4 
 5 int main()
 6 {
 7     double r1, r2, p1, p2;
 8     cin >> r1 >> p1 >> r2 >> p2;
 9     double fact1 = r1 * r2 * ( cos(p1) * cos(p2) - sin(p1) * sin(p2) );
10     double fact2 = r1 * r2 * ( cos(p1) * sin(p2) + sin(p1) * cos(p2) );
11     if(fabs(fact1) < 0.005) 
12     {
13         fact1 = 0;
14     }
15     if(fabs(fact2) < 0.005) 
16     {
17         fact2 = 0;
18     }
19     if(fact2 < 0)
20         printf("%.2lf%.2lfi\n",fact1, fact2);
21     else
22         printf("%.2lf+%.2lfi\n",fact1, fact2);
23     return 0;
24 }