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请教《The C Programming Language》中几个怎么也搞不懂在具体环境 下面几个句子是小老头我在看《The C Programming Language》中遇到的,其中的几个短语始终弄不清楚,请知道者指教,先行谢过。1. 句子:There are now signed and unsigned forms of all integer types, and notations for unsigned constants and hexadecimal character constants.  疑问:notations for unsigned constants and hexadecimal charater constans.notation在这里什么意思?character在这里又是什么意思?如何理解这句话。  出处:《The C Programming Language》第2段。2. 句子:String constants may be concatenated at compile time.   疑问:concatenate是连接,但是在这里如何理解这个句子,字符串常量在编译的时候如何连接,和谁连接。  出处:《The C Programming Language》第2段。3. 句子:Enumerations have become part of the language, formalizing a feature of long standing.  疑问:long standing 在这里什么意思。  出处: 《The C Programming Language》第2段。4. 句子: For external names, the standard guarantees uniqueness only for 6 characters and a single case.  疑问:在这里的a single case什么意思,是不是仅仅有这一种情况。  出处:《The C Programming Language》2.1节下面的第2段。5. 句子:for instance, if chars are 8 bits, unsigned char variables have values between 0 and 255, while signed chars have values between -128 and 127 (in a two's complement machine.)   疑问:in a two's complement machine是什么意思。  出处:《The C Programming Language》2.3节向上第4段。6. 句子:Whether plain chars are signed or unsigned is machine-dependent, but printable characters are always positive.   疑问:plain chars什么意思。  出处:《The C Programming Language》2.3节向上第4段。7. 句子:The type long double specifies extended-precision floating point. As with integers, the sizes of floating-point objects are implementation-defined; float, double and long double could represent one, two or three distinct sizes.   疑问:implementation-defined什么意思  出处:《The C Programming Language》2.3节向上第3段。谢谢各位
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