定义一个函数，具有一个浮点型参数，返回x^3-5x^2+16x-80=0  的值。在main函数中利用二分法求根。
看看错在哪里，谢谢了。
#include<stdio.h>
#include<math.h>

void result(float ,float);
int main(){
    float LEFT = -10.0;
    float RIGHT = 10.0;
   

    void result(float LEFT,float RIGHT);


}

void result(float LEFT,float RIGHT){
    float m,num1,num2,num;
   

        num1=pow(LEFT,3)-5*pow(LEFT,2)+16*LEFT-80;
        num2=pow(RIGHT,3)-5*pow(RIGHT,2)+16*RIGHT-80;
        num=pow(m,3)-5*pow(m,2)+16*m-80;
        if(LEFT<0.001)
        printf("%f",LEFT);
        
        else if(RIGHT<0.001)
        printf("%f",RIGHT);
        else if(LEFT*RIGHT<0){
            for(;;){
            m=(LEFT+RIGHT)/2;
            num=pow(m,3)-5*pow(m,2)+16*m-80;
            if(num<0.001){
            printf("%f",num);
            break;}
            else if(LEFT*num<0){
            RIGHT=num;
            LEFT=LEFT;}
            else
            {LEFT=num;
            RIGHT=RIGHT;}}
            
   
        }
   
   
    }