Difference between revisions of "If"
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Moving the comparison operator list from the "commands" topic.
imported>Simetrical m (IF moved to If) |
imported>Gblues (Moving the comparison operator list from the "commands" topic.) |
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Oblivion's <tt>if</tt> command is very powerful and comparable to "real" programming languages. | The <tt>if</tt> statement allows you to execute (or not execute) a block of script commands based on one or more comparisons that you specify. Oblivion's <tt>if</tt> command is very powerful and comparable to "real" programming languages. | ||
Assuming "a = 17", "b = 20" and "c = a - b", all of the following expressions work as expected. Parentheses are only needed when they're necessary for mathematical reasons. | == Comparison Operators == | ||
An if statement may contain one or more comparison operators. Below is a table of valid comparison operators: | |||
{|border="1" cellpadding="5" cellspacing="0" | |||
|- | |||
! style="background:#efefef;" | Operator | |||
! style="background:#efefef;" | Description | |||
|- | |||
| <nowiki>==</nowiki> | |||
| Exactly equal to | |||
|- | |||
| <nowiki>!=</nowiki> | |||
| Not equal to | |||
|- | |||
| <nowiki>></nowiki> | |||
| Greater than | |||
|- | |||
| <nowiki>>=</nowiki> | |||
| Greater than or equal to | |||
|- | |||
| <nowiki><</nowiki> | |||
| Less than | |||
|- | |||
| <nowiki><=</nowiki> | |||
| Less than or equal to | |||
|} | |||
It is important to note that there are no bitwise comparisons available in Oblivion's scripting language. | |||
== Combining Comparisons == | |||
Comparisons can be linked together using the following logical operators: | |||
{|border="1" cellpadding="5" cellspacing="0" | |||
|- | |||
! style="background:#efefef;" | Operator | |||
! style="background:#efefef;" | Description | |||
! style="background:#efefef;" | Example | |||
|- | |||
| <nowiki>&&</nowiki> | |||
| Logical AND | |||
| <nowiki>if x == 1 && y == 1 ; considered true only if both x and y equal 1.</nowiki> | |||
|- | |||
| <nowiki>||</nowiki> | |||
| Logical OR | |||
| <nowiki>if x == 1 || y == 1 ; considered true unless both x and y equal 0.</nowiki> | |||
|} | |||
== Comparisons and Expressions == | |||
The comparison operators can be used with any expression that can be evaluated into a number. Assuming "a = 17", "b = 20" and "c = a - b", all of the following expressions work as expected. Parentheses are only needed when they're necessary for mathematical or logical reasons. | |||
IF c == -3 && b == 20 | IF c == -3 && b == 20 | ||
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IF a - b == c | IF a - b == c | ||
IF a *4 - b * 4 == c * 4 | IF a *4 - b * 4 == c * 4 | ||
IF a * ( 5 + c ) - 14 == b | |||
IF 2*(a*(5+c)-14)==b - -b | |||
[[Category:Commands]] | [[Category:Commands]] | ||