Question

In C++:

Implement a function void root (double a, double b, double c, double& x1, double& x2) which assigns two solutions of quadratic equation aa bc0 to variables x1 and x2 Where a, b and c are real numbers. The 2 solutions are: Write the pre-condition and post-condition for two functions above (in questions 1 and 2). 2a

Answer 1

#include <iostream>

#include <cmath>

using namespace std;

void root(double a,double b,double c,double& x1,double& x2)

{

double dis, real, img;

dis = b * b - 4.0 * a * c;

if(dis > 1)

{

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

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

cout << x1 << ", " << x2 << endl;

}

else if(dis == 0)

{

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

cout << x1 << endl;

}

else

{

real = -b/(2*a);

img = sqrt(-dis)/(2*a);

cout << real << ", " << img << endl;

}

}

int main()

{

double a, b, c, x1 = 0.0, x2 = 0.0;

cout << "Enter coefficients a, b and c: ";

cin >> a >> b >> c;

root(a, b, c, x1, x2);

return 0;

}