一道分段函数题_§:з)))」∠)_

#include <stdio.h>
int main()
{
  int x,y;
  scanf("%d",&x);
  if(x < 5)
    y = 1- x*x*x;
  else if(x>=5 && x < 15)
    y = x -1;
  else
    y = 2*x*x -1;
  printf("y=%d\n",y);
  return 0;
}