HP 3000 Manuals HP 3000 Manuals
Unformatted Input/Output Unformatted input/output allows you to transfer data in internal representation (binary). Each unformatted input/output statement transfers exactly one record. Unformatted input/output to devices is done in binary mode. Unformatted Input Unformatted input is specified by the following input statement. Only the brief forms of the relevant syntax elements are shown here. For the complete syntax, refer to "READ Statement (Executable)" . Syntax READ ( unit [...] ) list ----------------------------------------------------------------------------------------------- | | | | | Item | Description/Default | Restrictions | | | | | ----------------------------------------------------------------------------------------------- | | | | | unit | Unit number of the file. | None. | | | | | ----------------------------------------------------------------------------------------------- | | | | | list | List of variables that specifies | None. | | | where the data is to be | | | | transferred. | | | | | | ----------------------------------------------------------------------------------------------- If list is omitted, the file is moved to the next record without data transfer. The list can contain implied DO loops. For syntax and detailed information on implied DO loops, refer to "DO Statement (Executable)" . With unformatted input, the format specifier (FMT) cannot be present in the WRITE statement. Because only one record is read when an unformatted READ statement is executed, the number of list elements must be less than or equal to the number of values in the record. A complex item requires two real values. The type of each input value should agree with the type of the corresponding list item. A complex value in the input record, however, can correspond to two real list items, or two real values can correspond to one complex list item. The data is transferred exactly as it is written; thus, no precision is lost. Unformatted Output Unformatted output is specified by the following output statement. Only the brief forms of the relevant syntax elements are shown here. For the complete syntax, refer to "WRITE Statement (Executable)" . Syntax WRITE ( unit ) [,] list ----------------------------------------------------------------------------------------------- | | | | | Item | Description/Default | Restrictions | | | | | ----------------------------------------------------------------------------------------------- | | | | | unit | Unit number of the file. | None. | | | | | ----------------------------------------------------------------------------------------------- | | | | | list | List of variables or expressions | None. | | | that specifies the data to be | | | | transferred. | | | | | | ----------------------------------------------------------------------------------------------- The list can contain implied DO loops. For syntax and detailed information on implied DO loops, refer to "DO Statement (Executable)" . If list is omitted, an empty record is written. If list contains a function reference, that function must not contain any READ or WRITE statements. With unformatted output, the format specifier FMT cannot be present in the WRITE statement. The output list must not specify more values than can fit into one record. If the specified values do not fill the record, the remainder of the record is undefined.