4.25打卡

#include<bits/stdc++.h>
int main()
{
    float solution(float a, float b, float c, float d);
    
        float a, b, c, d, x;
        printf("ÇëÊäÈë·½³ÌµÄϵÊý£º");
        scanf("%f %f %f %f", &a, &b, &c, &d);
        x=solution(a,b,c,d);
        printf("ËùÇ󷽳̵ĸùΪx=%f",x); 
}
float solution(float a, float b, float c, float d)
{
    float x0, x=1.5, f, fd, h;
    do{
        x0=x;
        f=a*x0*x0*x0+b*x0*x0+c*x0+d;
        fd=3*a*x0*x0+2*b*x0+c;
        h=f/fd;
        x=x0-h;
    }while(fabs(x-x0)>=1e-5);
    return x;
}