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Chapters:
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<a href="Introduction.html">1: Introduction</a><br>
<a href="SimpleExample.html">2: Simple example</a><br>
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<h3>9.3.31: `<font color="#82140F"><code>query</code></font>'</h3>
<!-- latex: \index{query} -->
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<PRE>
<font color="#82140F">
`query \synonym|.variable. \
["\prompt" ["\default"|.default.]]'
</font></PRE>
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<p>
Ask the user for the value of a variable (number) or synonym (text
string). Gri recognizes the type of the item being asked for, either a
variable or synonym, by the presence of a dot or backslash in the second
word of the command line. If a prompt string is given (in quotes), then
this string is shown to the user. If a default is given (in
parentheses), then it will be displayed also, and if the user types
carriage-return, then that item will be assigned to the variable or
synonym. If the default has more than one item, then Gri considers this
a restrictive list of possibilities, and will demand that the answer be
in that list, going into an infinite query loop until an item from the
list (or carriage-return, meaning take first item) is found. The items
in the list are to be separated by spaces, not commas or any other
non-whitespace characters.
<p>
NOTE: The `<font color="#82140F"><code>-y</code></font>' command-line option bypasses all query commands,
fooling Gri into thinking that the user typed a carriage-return to all
questions. Thus the defaults, if they exist, are selected.
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