编辑代码

#include <stdio.h>
int main (void)
{
    double x, y;
    printf("Enter x(x>=0):\n");
    scanf("%If",&x);
    if (x<=15){
        y=4*x/3;
    }else{
        y=2.5*x-10.5;
    }
    printf("y=f(%f)=%f\n", x, y);

    return 0;
}