#!/usr/local/bin/tcc -run
#include "stdafx.h"
#include "math.h"

int main()
{
	double a, b, c, D, x1, x2, e, f;
	printf("ax^2+bx+cの係数を入力してください\n");
	printf("a=");
	scanf_s("%lf", &a);
	printf("b=");
	scanf_s("%lf", &b);
	printf("c=");
	scanf_s("%lf", &c);
	D = b*b - 4 * a*c;
	x1 = (-b + sqrt(D)) / (2 * a);
	x2 = (-b - sqrt(D)) / (2 * a);
	e = -b / (2 * a);
	f = sqrt(-D) / (2 * a);
	if (a == 0) {
		if (b == 0) {
			printf("解無し");
		}
		else {
			printf("x=%lf", -b / c);
		}
	}
	else if (D == 0) {
		printf("x=%lf", -b / (2 * a));
	}
	else if (D > 0) {
		printf("x=%lf,%lf", x1, x2);
	}
	else {
		printf("x=%lf±%lfi", e, f);
	}
    return 0;
}