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去掉浮点多余的0

当arg为5.000时,用%f输出5.000,想输出5用%g,如下:

[NSString stringWithFormat:@"%@:%g, %@:%g", L(@"STR_ID_TOPIC"), dto.topicCount, L(@"STR_ID_REPLY_NUM"), dto.replyCount]

去掉浮点多余的0