What is displayed when the following is executed

What is displayed when the following is executed;

double d1=-0.5;
System.out.println("Ceil d1="+Math.ceil(d1));
System.out.println("floor d1="+Math.floor(d1));

 

• Ceil d1=-0.0
  floor d1=-1.0

• Ceil d1=0.0
  floor d1=-1.0

• Ceil d1=-0.0
  floor d1=-0.0

• Ceil d1=0.0
  floor d1=0.0

• Ceil d1=0
  floor d1=-1

A

• ceil：大于等于 x，而且与它最接近的整数。
• floor：小于等于 x，且与 x 最接近的整数。
• 若是参数小于0且大于-1.0，结果为 -0