分段函数

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

double zxd(double x);
int main ()
{
    double x;
    int t;
    scanf("%d", &t);
    while (t--)
    {
        scanf("%lf",&x);
        double y = zxd(x);
        printf("%.2lf\n",y);
    }
    return 0;
}
double zxd(double x)
{
    double y;
    if((x > 0)&&(x < 10))
    {
        y = log2(x);
    }
    else if(x < 0)
    {
        y = fabs(x)+sin(x);
    }
    else if(x == 0)
    {
        y = 0.00;
    }
    else
    {
        y = x * x;
    }
    return y;
}