#include"iostream"
using namespace std;
void save1(int a, int b, int c);
void save2(int a, int b, int c);
void save3(int a, int b, int c);
int main()
{
 cout << "求解Ax^2+Bx+C=0的解" << endl;
 cout << "please input A  B  C" << endl;
 cout << "輸入一個參數(shù)后,，請按回車鍵" << endl;
 cout << "input A:";
 int A; cin >> A; cout << endl;
 cout << "input B:";
 int B; cin >> B; cout << endl;
 cout << "input C:";
 int C; cin >> C; cout << endl;
 int temp = B * B - 4 * A*C;
 if (temp < 0)
 {
  save1(A,B,C);
 }
 if (temp ==0)
 {
  save2(A, B, C);
 }
 if (temp > 0)
 {
  save3(A, B, C);
 }
 
 system("pause");
 return 0;
}
void save3(int a, int b, int c)
{
 double temp = b * b - 4 * a*c;
 double tenp1 = sqrt(temp);
 double x = (-b + tenp1) / 2 * a;
 double x1 = -x;
 cout << "第一個解" << x << endl;
 cout << "第二個解" << x1 << endl;
}
void save2(int a, int b, int c)
{
 double temp = b * b - 4 * a*c;
 double tenp1 = sqrt(temp);
 double x = (-b + tenp1) / 2 * a;
 cout << "一個解" << x << endl;
}
void save1(int a, int b, int c)
{
 double temp, real1, real2, image1, image2;
 temp = -(b*b - 4 * a * c);
 real1 = -b / (2 * a *1.0);
 real2 = real1;
 image1 = sqrt(temp);
 image2 = -image1;
 cout << "兩個虛根" << endl;
 cout << "x1 = " << real1 << " + " << image1 << "j" << endl;
 cout << "x2 = " << real2 << image2 << "j" << endl;

}