By Franz L., Rubinoff, Morris Alt

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Ershov said [I21 that there are two paths for the future development of programming programs (translators) which are of equal importance. One way leads to more flexible translators allowing for the use of more complicated forms of source programs, thus reducing the time that the programmer must spend in preparation of the programs. The alternate way leads to translators which would produce object programs more quickly and, what is perhaps even more important, would produce object programs that work more quickly and use fewer working cells.

3. Logical conditions in PP-2 are coded ,by means of Lukhovitskaya’s algorithm [as]. This algorithm decodes any logical statement built up of predicates (cf. 1) and the logical operators v (alternation), (conjunction), and - (negation), and produces a code which secures execution of all prescribed control transfers. Let us assume that P is either 1 or 0 , and control is to be transferred to A if P = 1, and to B otherwise. Lukhovitskaya’s algorithm works as follows. (i) The first pair of corresponding left and right parentheses is found.

A forming operator may sometimes be used instead of a restoring one, this being especially convenient when the number of readdressings t o be performed on a parameter is not known in advance. , if the forming operator is to restore the initial value s of the parameter i we shall write {s+i). It may be of some interest to note that, while restoring operators are likely to perpetuate minor mutilations of a program already recorded, forming operators are more likely to avoid this fault. , parameter change operators are used when not only readdressing controlled by a parameter is desired but also introduction of the numerical value of altered parameter into arithmetic formulas.

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