Answer to Question #323330 in C++ for Vannet

Question

Write a function to calculate and return the roots of a quadratic equation ax2 + bx + c = 0.

Return x1 and x2 through

parameter of the function. The prototype of this function is defined by:

void solveEquation(int a, int b, int c, float *x1, float *x2);

Answer 1

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

void solveEquation(int a, int b, int c, float *x1, float *x2) 
{
    double d = b*b - 4*a*c;
    if (d < 0) {
        cout << "Equation does not have real roots" << endl;
        return;
    }
    *x1 = (-b + sqrt(d)) / (2*a);
    *x2 = (-b - sqrt(d)) / (2*a);
}


int main() {
    int a, b, c;
    float x1, x2;

    cout << "Enter coefficients a, b, c: ";
    cin >> a >> b >> c;

    solveEquation(a, b, c, &x1, &x2);

    cout << "The roots are " << x1 << " and " << x2 << endl;

    return 0;
}