题解 | #求解立方根#

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

float fun(float a){
    return a*a*a;
}

int main() {
    float val,temp;
    scanf("%f",&val);
    temp = val;
    temp = fabs(temp);

    if(val==0){
        printf("0");
        return 0;
    }

    float i=0;
    for(;i<20;i+=0.1){

        if((fabs(fun(i)-temp)<fabs(fun(i-0.1)-temp))&&(fabs(fun(i)-temp)<fabs(fun(i+0.1)-temp))){
            break;
        }
    }
    if(val>0){
        printf("%.1f",i);
    }
    else
        printf("%.1f",-i);

    return 0;
}