Commodore Computer Commodore 64 Uživatelský manuál stáhnout pdf (Strana 24)

statement PRINT# 5, A$; B$; C$:

char

CR stands for the CRR$ code of 13, the carriage return, which is PRINTed

at the end of every PRINT or PRINT# statement unless there is a comma or

semicolon at the end of the line.

NOTE: Do not leave a space between PRINT and #, and do not try to

abbreviate the command as ?#. See the appendixes in the user manual for

the correct abbreviation.

FORMAT FOR INPUT#STATEMENT:

INPUT# file#, variable list

When using the INPUT# to read this data in, there is no way to tell that

it's not supposed to be one long string. You need something in the file to act as a

separator. Characters to use as separators include the CR, a comma or a

semicolon. The CR can be added easily by just uSingone variableper line on the

PRINT# statement, and the system pUtsone there automatically. The statement

PRINT# 5, A$: PRINT# 5, B$: PRINT# 5, C$ puts a CR after every variable

being written, providing the proper separation for a statement like INPUT#5,

AS, B$, C$. Or else a line like Z$= ..,": PRINT# 5, A$ Z$ B$Z$ C$ will do the

job as well, and in less space. The file after that line looks like this:

char

Putting commas between variablesresults in lots of extra space on the disk

being used. A statement like PRINT# 5, A$, B$ makes a file that looks like:

char

You can see that much of the space in the file is wasted.

The moral of all this is: take care when using PRINT# so your data will be

in order for reading back in.

Numeric data written in the file takes the form of a string, as if the STR$

function had been performed on it before writing it out. The first character will

be a blank space if the number is positive, and a minus sign (-) if the number is

negative. Then comes the number,and the last character is the cursor right

character. This format provides enough information for the INPUT# statement

to read them in as separate numbers if several are written with no other special

separators. It is somewhat wasteful of space, since there can be two unused

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Commodore Computer Commodore 64 Uživatelský manuál Strana 24