【算法笔记】codeup 例题3-5 求一元二次方程的根

#include <stdio.h>
#include <math.h>

int main()
{

	double a, b, c, r1, r2;
	scanf("%lf%lf%lf", &a, &b, &c);

	r1 = (-b + sqrt(b * b - 4 * a * c)) / (2 * a);
	r2 = (-b - sqrt(b * b - 4 * a * c)) / (2 * a);

	printf("r1=%7.2f\nr2=%7.2f\n", r1, r2);
	return 0;
}