代码生成（计算一元三次函数）

我可以回答这个问题。计算一元三次函数的代码可以写成：

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

int main()
{
double a, b, c, d, x1, x2, x3;
printf("请输入一元三次函数的系数：\n");
scanf("%lf %lf %lf %lf", &a, &b, &c, &d);
double delta = b * b - 3 * a * c;
if (delta > )
{
x1 = (-b + sqrt(delta)) / (3 * a);
x2 = (-b - sqrt(delta)) / (3 * a);
x3 = (-b - sqrt(delta)) / (3 * a);
printf("一元三次函数的解为：x1 = %lf, x2 = %lf, x3 = %lf\n", x1, x2, x3);
}
else if (delta == )
{
x1 = x2 = x3 = -b / (3 * a);
printf("一元三次函数的解为：x1 = x2 = x3 = %lf\n", x1);
}
else
{
double p = -b / (3 * a);
double q = sqrt(-delta) / (3 * a);
x1 = p + 2 * q;
x2 = x3 = p - q;
printf("一元三次函数的解为：x1 = %lf + %lfi, x2 = %lf - %lfi, x3 = %lf - %lfi\n", p, q, p, q, p, q);
}
return ;
}