# include <iostream>
# include <math.h>
void eingabe(double* a, double* b, double* c);
void ausgabe(double* a, double* b, double* c, double* D);
using namespace std ;
int main(void)
{
double a = 0;
double b = 0;
double c = 0;
double D = 0; // a * x * x + b * x + c = 0
eingabe(&a, &b, &c);
D = b *b -4* a * c ;
ausgabe(&a, &b, &c, &D);
}
void eingabe(double* a, double* b, double* c){
cout << "\nKoeffizienten a x^2 + b x + c : ";
cin >> *a >> *b >> *c ;
}
void ausgabe(double* a, double* b, double* c, double* D){
if ( *D ==0) {
cout << " x = " << -(*b) /(2* (*a) ) << endl;
}
if (*D >0) {
cout << " x = " << ( - (*b) + sqrt(*D))/(2* (*a) ) << " und x = " << ( -(*b) - sqrt(*D))/(2* (*a) ) << endl;
}
if (*D <0) {
cout << " x = " << -(*b) /(2* (*a) ) << "+ -" << sqrt( - (*D) )/(2* (*a) ) << "* i " << endl;
}
}
