Difference between revisions of "Basic Pascal Tutorial/Chapter 2/EOLN and EOF"
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<tt>EOLN</tt> is a Boolean function that is <tt>TRUE</tt> when you have reached the end of a line in an open input file. | <tt>EOLN</tt> is a Boolean function that is <tt>TRUE</tt> when you have reached the end of a line in an open input file. | ||
| − | + | <delphi> | |
| + | eoln (file_variable) | ||
| + | </delphi> | ||
If you want to test to see if the standard input (the keyboard) is at an end-of-line, simply issue <tt>eoln</tt> without any parameters. This is similar to the way in which <tt>read</tt> and <tt>write</tt> use the console (keyboard and screen) if called without a file parameter. | If you want to test to see if the standard input (the keyboard) is at an end-of-line, simply issue <tt>eoln</tt> without any parameters. This is similar to the way in which <tt>read</tt> and <tt>write</tt> use the console (keyboard and screen) if called without a file parameter. | ||
| − | + | <delphi> | |
| + | eoln | ||
| + | </delphi> | ||
<tt>EOF</tt> is a Boolean function that is <tt>TRUE</tt> when you have reached the end of the file. | <tt>EOF</tt> is a Boolean function that is <tt>TRUE</tt> when you have reached the end of the file. | ||
| − | + | <delphi> | |
| + | eof (file_variable) | ||
| + | </delphi> | ||
Usually, you don't type the <tt>end-of-file</tt> character from the keyboard. On DOS/Windows machines, the character is <tt>Control-Z</tt>. On UNIX/Linux machines, the character is <tt>Control-D</tt>. | Usually, you don't type the <tt>end-of-file</tt> character from the keyboard. On DOS/Windows machines, the character is <tt>Control-Z</tt>. On UNIX/Linux machines, the character is <tt>Control-D</tt>. | ||
Revision as of 16:21, 5 January 2010
2E - EOLN and EOF (author: Tao Yue, state: unchanged)
EOLN is a Boolean function that is TRUE when you have reached the end of a line in an open input file. <delphi> eoln (file_variable) </delphi>
If you want to test to see if the standard input (the keyboard) is at an end-of-line, simply issue eoln without any parameters. This is similar to the way in which read and write use the console (keyboard and screen) if called without a file parameter. <delphi> eoln </delphi>
EOF is a Boolean function that is TRUE when you have reached the end of the file. <delphi> eof (file_variable) </delphi>
Usually, you don't type the end-of-file character from the keyboard. On DOS/Windows machines, the character is Control-Z. On UNIX/Linux machines, the character is Control-D.
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