以一个函数实例运算出x的值和y的值

#include <stdio.h>#include <stdlib.h>float f1(float x){    float y;    y=3*x*x*x+2*x*x-1;    return y;}int main(){    float x,y;    scanf("%f",&x);    y=f1(x);    printf("x=%3f,y=%3f\n",x,y);    return 0;}