A format specification, which consists of optional and required fields, has the following form: %[flags] [width] [.precision] [{h | l | ll | I | I32 | I64}]type Each field of the format specification is a single character or a number signifying a particular format option. The simplest format specification contains only the percent sign and a type character (for example, %s). If a percent sign is followed by a character that has no meaning as a format field, the character is copied to stdout.
llx是以16进制格式显示64位数？