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Allows data to be gathered from an LW file and the RUN command line.
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numeric expression used to specify a record number; record numbers begin with zero |
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The input statement for LW files is restricted; only one character variable may be designated in the list and the record from the file will be read into this variable. This form of INPUT is useful for reading text files. Refer to the OPEN statement regarding fixed length and variable length records. The INPUT statement in this form handles both; the (r) record number is available for either format.
INPUT @3, A$
IF MID$(A$,1,4)=EOF$ GOTO xxx
This example tests for an end-of-file, using the pseudovariable EOF$.
Values are taken from the RUN command line as positional parameters of a normal McIDAS command. If the named variable is numeric, it is picked up as a number. If the variable is a character string, the value is picked up as a character parameter (up to 12 characters, no blanks). Each INPUT statement of this form picks up the next positional parameter. Thus, these statements are equivalent to the single INPUT statement above:
INPUT a
INPUT b
INPUT c
If the RUN command line contains a quoted string (for example, "THIS IS A QUOTED STRING), it may be read by using a character variable. The first character in the variable is a double quote (") to indicate it was picked up from the quoted string. An attempt to input a parameter which is not present results in either a numeric value of zero or a character string of length zero.
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