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Additional resources for ADA An Introduction: Ada Reference Manual (July 1980)
As a result, problems such as the organization of program units, the scope of names, the control of errors, and the difficulties of making modifications must be resolved. In this chapter we discuss the nesting of program units (subprograms, packages, and tasks) and the visibility rules defining which declared identifiers can be referenced in a given region of program text. We also treat separate compilation, a major facility for controlling program development. While useful even for small programs, for large programs separate compilation is central.
As illustrated in the above calls, an argument corresponding to an in parameter can be an expression. For out and in out parameters, the argument must be a variable; the value of such a variable may be updated by execution of the procedure. Ada offers another, less traditional, method for calling subprograms. We can explicitly state the association between arguments and their corresponding parameters. For example, consider the procedure specification: procedure MERGE (NEW_ITEMS: in TABLE; ITEMS_TO_UPDATE: in out TABLE); Instead of a positional call, say MERGE (SOURCE_DAT~.
Since STRING is an array type, a variable of type STRING can be declared by giving the bounds of its indices. For example, we can say: FIRST_NAME, LAST_NAME: STRING(1 .. 10); INPUT_LINE: STRING(1 .. 72) Explicit character strings can be written in the familiar way, by enclosing the sequence of characters within double quotes. For example, we can write: FIRSLNAME - "GEORGE "· LASLNAME "WASHINGTON"; PUT ("THIS MESSAGE"); Observe that an explicit character string can be viewed as a shorthand notation for a positional array aggregate.