gulp压缩css插件:C语言作业(高手请进)

几元几次方程啊。。。

方程式为：f(x) = 0，示例中f(x) = 1+x-x^3

使用示例：
input a b e: 1 2 1e-5
solution: 1.32472

源码如下：

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

double f(double x)
{
return 1+x-x*x*x;
}

int main()
{
double a = 0, b = 0, e = 1e-5;
printf("input a b e: ");
scanf("%lf%lf%lf", &a, &b, &e);
e = fabs(e);
if (fabs(f(a)) <= e)
{
printf("solution: %lg\n", a);
}
else if (fabs(f(b)) <= e)
{
printf("solution: %lg\n", b);
}
else if (f(a)*f(b) > 0)
{
printf("f(%lg)*f(%lg) > 0 ! need <= 0 !\n", a, b);
}
else
{
while (fabs(b-a) > e)
{
double c = (a+b)/2.0;
if (f(a)* f ( c ) < 0)
b = c;
else
a = c;
}
printf("solution: %lg\n", (a+b)/2.0);
}
return 0;
}