1. Fachtagung über Programmiersprachen: München, 9.–11. März by R. Schild (auth.), Prof. Dr. Hans Langmaack, Prof. Dr.

By R. Schild (auth.), Prof. Dr. Hans Langmaack, Prof. Dr. Manfred Paul (eds.)

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Additional info for 1. Fachtagung über Programmiersprachen: München, 9.–11. März 1971

Sample text

9EJ~' are necessAry in some cl'Ises And c~n contain the result of fl fixed point multiplic"ltion, the dividend of 9n inteper division, or the operand for a long shift. 9£! words and i~dex cells. ' of t)1e tvpe of words the indices proceed from o in halfword steps "IS do the machine addresses; otherwise mixing assembler code and PS 440 could become hazardous. mT bit p'roup in ~ word as we will see later and in the following examples. £ I,1, L? 4-bit words declares three dOUble words then "G1 of R1" would give the right hAlf of the second full word in R1.

Now, if we wish to talk about one of these specific names of six, we enclose it in quotes; thus "6" serves as the name of a particular graphic character which. in turn. names a specific integer. Bliss makes a similar distinction except that the objects named are variables. , their value may change in time, represented in some storage media in the computer. The name of a variable, also called a pointer to the variable. is encoded as a bit pattern which itself may be manipulated. a variable. An identifier serves as the name of a name of (pointer to) To complete our analogy, then.

Altllouah they are not implemented in this way. th one more formal parameter than is explicitly mentioned. j); conceptually is identical to a function declaration function ary2(fll ,f1,f2) .. e •• to "ary2 (x •• a,. b)" and "ary2 (y •• b •• a)". Since. \tion. thet"e 1s an implicit. unpnamed formal parameter. the name of the structure class itself is used to denote this "zero-th" paranleter. This convention maintains the posi- tional correspondence of actua1s anel formals. Thus. b) 38 The value of this expression is a pointer to the designated elentent of the segment named by x.

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