Program
#include<iostream>
#include<math.h> //to calculate square root
using namespace std;
int main()
{
float root1,root2,a,b,c,d,imaginaryPart,realPart;
cout<<"Quadratic Equation is ax^2+bx+c=0";
cout<<"\nEnter values of a,b and c:";
cin>>a>>b>>c;
d=(b*b)-(4*a*c);
if(d>0)
{
cout<<"\nTwo real and distinct roots";
root1=(-b+sqrt(d))/(2*a);
root2=(-b-sqrt(d))/(2*a);
cout<<"\nRoots are "<<root1<<" and "<<root2;
}
else if(d==0)
{
cout<<"\nTwo real and equal roots";
root1=root2=-b/(2*a);
cout<<"\nRoots are "<<root1<<" and "<<root2;
}
else{
cout<<"\nRoots are complex and imaginary";
realPart = -b/(2*a);
imaginaryPart = sqrt(-d)/(2*a);
cout<<"\nRoots are "<<realPart<<"+"<<imaginaryPart<<"i and "<<realPart<<"-"<<imaginaryPart<<"i";
}
return 0;
}
Output
Quadratic Equation is ax^2+bx+c=0
Enter values of a,b and c:3
4
1
Two real and distinct roots
Roots are -0.333333 and -1