1028

 1 #include <iomanip>

 2 using namespace std;

 3 float x1,x2,d,p,q;

 4 int main()

 5 {

 6     void greater(float,float);

 7     void equal(float,float);

 8     void smaller(float,float);

 9     float a,b,c; 

10     cin>>a>>b>>c;

11     d=b*b-4*a*c;

12     if(d>0)

13     {

14         greater(a,b);

15         cout<<setiosflags(ios::fixed)<<setprecision(3);

16         cout<<"x1="<<x1<<" "<<"x2="<<x2<<endl;

17     }

18     else if(d==0)

19     {

20         equal(a,b);

21         cout<<setiosflags(ios::fixed)<<setprecision(3);

22         cout<<"x1="<<x1<<" "<<"x2="<<x2<<endl;

23     }

24     else

25     {

26         smaller(a,b);

27         cout<<setiosflags(ios::fixed)<<setprecision(3);

28         cout<<"x1="<<p<<"+"<<q<<"i"<<" ";

29         cout<<"x2="<<p<<"-"<<q<<"i"<<endl;

30     }

31     return 0;

32 }

33 void greater(float a,float b)

34 {

35     x1=(-b+sqrt(d)/(2*a));

36     x2=(-b-sqrt(d)/(2*a));

37 }

38 void equal(float a,float b)  

39 {

40     x1=x2=(-b)/(2*a);

41 }

42 void smaller(float a,float b)

43 {

44     p=-b/(2*a);

45     q=sqrt(-d)/(2*a);

46 }