need help with c++ program

I need some help with a c++ program for my class, i can't figure out whats going on.

Code:

Sample Input 	Sample Output
1, -3, -10 	-2, 5
3, 6, 3 	-1
2, -2, -12 	-2, 3
3, -2, 20 	NO REAL ROOTS

Here is so far what ive got

Code:

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    double a, b, c, d;
    double root1, root2, temp;
    
    //output
    
    cout << "enter a, b, c";
    cin >> a >> b >> c;
    
    //process
    
    d = pow(b,2) - 4 * a * c;
    if(d >= 0)
    {
          root1 = (-b + sqrt(d))/(2 * a);
          }
          if(d > 0)
          {
                 root2 = (-b + sqrt(d))/(2*a);
                 }
                                  if(root1 > root2)
                 {
                                temp = root1;
                                root1 = root2;
                                root2 = temp;
                                }

                                
                                // output
                                
                                if(d >= 0)
                                {
                                        cout << root1 << " ";
                                        }
                                        if(d > 0)
                                        {
                                               cout << root2 << " " <<endl;
                                        }
                                        if(d < 0)
                                        {
                                               cout <<"No Real Roots" << " ";
                                               }
                                               cin.get();
                                               cin.get();
                                               return 0;
                                               }

Can someone help me out with the sample output. i get the 2nd integer, but i dont get the first.

 

Erm... i'm not that advanced in programming, but have studied quadratic formulas abit...

Tell me if i'm wrong, but you have worked out root one and root two as the same.

root1 = (-b + sqrt(d))/(2 * a);
root2 = (-b + sqrt(d))/(2*a);

doesn't one of them need to be a minus?

root2 = (-b - sqrt(d))/(2*a);

If not it's probably me just reading it wrong.

As for your output i'm not entirley sure... sure.

Ill have a try of making this my self, looks fun =]

 

I know you want to do this your self, as most people do. But i found this if you want to try see where you have gone wrong. Or look for a few hints.

// Determine real and complex roots of a quadratic equation and check results
// ax^2 + bx + c = 0

#include <iostream>
#include <math.h>
#include <complex>
using namespace std;

int main(void)
{
float a, b, c, x1, x2, root;
complex<float> z;

cout << "Roots of quadratic equation, Enter a, b and c ? ";
cin >> a >> b >> c;

root = b * b - 4.0f * a * c; // b*b - 4ac
if (root >= 0.0f) // if +
{
root = sqrt(root); // real roots
x1 = (-b + root) / (2.0f * a);
x2 = (-b - root) / (2.0f * a);
cout << "Real roots " << x1 << " and " << x2 << endl;
cout << "Test " << a * x1 * x1 + b * x1 + c // check result
<< " and " << a * x2 * x2 + b * x2 + c << endl;
}
else
{ // complex roots
root = sqrt(-root) / (2.0f * a);
x1 = -b / (2.0f * a);
cout << "Complex roots " << x1 << " +- i " << root << endl;
z = complex<float>(x1, root);
cout << "Test " << a * z * z + b * z + c; // check result
z = complex<float>(x1, -root);
cout << " and " << a * z * z + b * z + c << endl;
}
system("pause");
return 0;
}

 

yes because someone just learning simple algebra definitely understands how complex and imaginary numbers work.