C++程序，怎么写，谢谢

#include
void calculator1(double a,double b,double c,double t)
{
t=sqrt(t);
cout<<"x1="<<(-b-t)/(2*a)<<" "<<"x2="<<(-b+t)/(2*a)<}
void calculator2(double a,double b,double c)
{
cout<<"x="<<-b/(2*a)<}
void calculator3(double a,double b,double c,double t)
{
t=sqrt(-t);
cout<<"x1="<<-b/(2*a)<<"-"<}
void main()
{
double a=0,b=0,c=0;
double t;
cout<<"a*x^2+b*x+c=0"< cin>>a;
cout<<"b:";
cin>>b;
cout<<"c:";
cin>>c;
cout<
t=b*b-4*a*c;
if(t>0)
calculator1(a,b,c,t);
else if(t==0)
calculator2(a,b,c);
else
calculator3(a,b,c,t);
}