Question

I was asked to write a program that finds the solutions, if any, to a given quadratic equation. My code is below. I have two issues: First When i input for example, a=3, b=4, c=5 the result prints" The roots are -nan and -nan" Secondly, I am to ensure that division by 0 is not permitted and the discriminant b^2-4ac cannot be negative. I am having a hard time with this bit. Could you help me solve this part?

Answer 1

HERE IS MY CODE:



#include <iostream>
#include <cmath>
using namespace std;

int main(){
/* Here I have initialized some variables a,b and c that you would see in a standard quadratic equation.
positive_root and negative_root are the roots you get when using the quadratic formula to solve
a quadratic equation given the values of a,b and c */
double a, b, c, positive_root, negative_root;

cout<<" enter value of a,b and c : "<<endl;
cin>>a>>b>>c;
// using the functions sqrt() and pow(), we
positive_root= (-b + sqrt(( pow(b,2)- 4*a*c)))/ 2*a ;
negative_root= (-b - sqrt(( pow(b,2)- 4*a*c)))/ 2*a ;

cout << " The roots are:"<<positive_root<< " and "<< negative_root<<endl;

return 0;
}