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：大於等於 x，而且與它最接近的整數。
• floor：小於等於 x，且與 x 最接近的整數。
• 若是參數小於0且大於-1.0，結果爲 -0