一元二次方程

#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>#include<math.h>#define EXP 0.000000001int main(){double a, b, c,x, x1, x2, disc;scanf("%lf%lf%lf", &a, &b, &c);disc = b*b - 4*a*c;if ((a > -EXP) && (a < EXP))printf("不是一元二次方程");else if ((disc>-EXP) && (disc < EXP)){x = -b / (2 * a);printf("x=%lf\n", x);}else{if (disc>0.0){x1 = (-b + sqrt(disc)) / (2 * a);x2 = (-b - sqrt(disc)) / (2 * a);printf("x1=%lf,x2=%lf\n", x1, x2);}else        printf("有两个共轭复根");}return 0;}