Difference between revisions of "Statement Reference"
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imported>Jlundin (Created page with "A statement is an arrangement of expressions used to perform work (and may just be a simple expression). There are also some more complicated statements ...") |
imported>Teapare m |
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<br> | <br> | ||
<source lang="papyrus"> | <source lang="papyrus"> | ||
; Create a float variable | ; Create a float variable named seconds that starts with a default value | ||
float seconds = CurrentTimeInMinutes() * 60.0f | float seconds = CurrentTimeInMinutes() * 60.0f | ||
</source> | </source> | ||
| Line 33: | Line 33: | ||
; Assign 5 to x | ; Assign 5 to x | ||
x = 5 | x = 5 | ||
;This assignment is equivalent to x = x + 5 | |||
x += 5 | |||
;This assignment is equivalent to x = x * (5 + 5) | |||
x *= 5 + 5 | |||
</source> | </source> | ||
<br> | <br> | ||
| Line 71: | Line 77: | ||
<source lang="papyrus"> | <source lang="papyrus"> | ||
; If value is true, will set x to 1, otherwise it will do nothing | ; If value is true, will set x to 1, otherwise it will do nothing | ||
if value | if (value) | ||
x = 1 | x = 1 | ||
endIf | endIf | ||
| Line 78: | Line 84: | ||
<source lang="papyrus"> | <source lang="papyrus"> | ||
; If myCoolValue is 20, will set x to 5, otherwise it will set it to 10 | ; If myCoolValue is 20, will set x to 5, otherwise it will set it to 10 | ||
if myCoolValue == 20 | if (myCoolValue == 20) | ||
x = 5 | x = 5 | ||
else | else | ||
| Line 87: | Line 93: | ||
<source lang="papyrus"> | <source lang="papyrus"> | ||
; If the value is above 10 it will set x to 1, if it is below 10 it will set x to -1, otherwise it will set x to 0 | ; If the value is above 10 it will set x to 1, if it is below 10 it will set x to -1, otherwise it will set x to 0 | ||
if value > 10 | if (value > 10) | ||
x = 1 | x = 1 | ||
elseif value < 10 | elseif (value < 10) | ||
x = -1 | x = -1 | ||
else | else | ||
x = 0 | x = 0 | ||
endIf | endIf | ||
</source> | |||
<br> | |||
<source lang="papyrus"> | |||
; if the sum of x and y is less than 10, set z to 1, otherwise set z to -1. | |||
if ((x + y) < 10) | |||
z = 1 | |||
else | |||
z = -1 | |||
endif | |||
</source> | </source> | ||
| Line 107: | Line 122: | ||
; Loop until x is 10 | ; Loop until x is 10 | ||
x = 0 | x = 0 | ||
while x < 10 | while (x < 10) | ||
DoCoolStuff() | DoCoolStuff() | ||
x += 1 | x += 1 | ||
endWhile | endWhile | ||
</source> | |||
=== While and Variable Lifetime === | |||
Variables defined inside While loops have a lifetime of as many times as the loop runs, not a lifetime of each iteration of the loop as one might expect. This means that it is very important to always assign a value to variables defined inside a While loop, or avoid defining variables inside While loops altogether. | |||
Here is an example to illustrate this potential pitfall. | |||
<source lang="papyrus"> | |||
int i = 0 | |||
while i < 5 | |||
int j | |||
j += 1 | |||
debug.trace("j = " + j) | |||
endWhile | |||
</source> | |||
Here, j is defined inside the loop. Since we are calling "int j" each iteration, and since the default value of an integer is 0, we might expect output that resembles: | |||
<source lang="papyrus"> | |||
[06/04/2016 - 01:24:38PM] j = 1 | |||
[06/04/2016 - 01:24:38PM] j = 1 | |||
[06/04/2016 - 01:24:38PM] j = 1 | |||
[06/04/2016 - 01:24:38PM] j = 1 | |||
[06/04/2016 - 01:24:38PM] j = 1 | |||
</source> | |||
However, since j's value is maintained across iterations of the loop, we instead get: | |||
<source lang="papyrus"> | |||
[06/04/2016 - 01:49:52PM] j = 1 | |||
[06/04/2016 - 01:49:52PM] j = 2 | |||
[06/04/2016 - 01:49:52PM] j = 3 | |||
[06/04/2016 - 01:49:52PM] j = 4 | |||
[06/04/2016 - 01:49:52PM] j = 5 | |||
</source> | </source> | ||