为什么选A？

wangstriking

[a]等于不小于a的最小整数，问a是否大于-3：
                

1、[a/2]=0

2、[a/4]=0                    答案是a

cypolo

MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">[a/2]=0的话，MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">a必然介于（MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">-2，MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">0）之间，肯定大于MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">-3，换成是MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">4的话，MingLiU","serif"; mso-bidi-font-family: Tahoma;">

范围扩大为（MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">-4，MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">0），不确定与MingLiU","serif"; mso-bidi-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-fareast-language: ZH-CN;">-3哪个大