Difference between revisions of "Category:LSL 整数"

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{{Multi-lang|Category:LSL Integer|/ja}}
{{LSL Header{{#var:lang}}|ml=*}}{{LSLC{{#var:lang}}|}}
{{LSLC/ja|Types}}


=Integers=
The integer data type is a signed 32 bit value between −2,147,483,648 and +2,147,483,647 (that is 0x80000000 to 0x7FFFFFFF in hex). Integers are whole numbers. The fractional datatype is the [[float]].
[[DEBUG_CHANNEL]] can be used as a constant for the maximum integer (for that is the value it is defined as).
==Examples==
All of the following are integers:
<source lang="lsl2">integer firstInt = 5512623;
integer secondInt = ACTIVE;
integer thirdInt = 0x61EC1A;
integer fourthInt = -160693;</source>
The following are NOT integers, use {{LSLG|float}} for them:
<source lang="lsl2">
integer decimalValue = 125.2; // ERROR : Type mismatch -- Integer literals can't have a decimal.
integer bigValue = 3147483647; // An undocumented way to say -1,147,483,649 // Integer literals can't be larger than 2,147,483,647.
integer biggerValue = 10123456789; // An undocumented way to say -1 // Integer literals can't be larger than 2,147,483,647.
</source>
The following function can be used to determine whether a string of characters consists only of integers. This can be important if you need to know that a user has entered a valid integer in chat or a textbox, for example.
<source lang="lsl2">
integer IsInteger(string var)
{
    integer i;
    for (i=0;i<llStringLength(var);++i)
    {
        if(!~llListFindList(["1","2","3","4","5","6","7","8","9","0"],[llGetSubString(var,i,i)]))
        {
            return FALSE;
        }
    }
    return TRUE;
}</source>
Here's a simpler solution for strings containing positive or negative decimal integers (values from −2147483648 and 2147483647 written without + sign, leading zeros, or thousands separators ',' ). Omei Qunhua.
<source lang="lsl2">
    if ( (string) ( (integer) data) == data)
        llOwnerSay("'" + data + "' contains a valid integer");
</source>
The following examples will validate that a string contains only the characters 0 though 9. Omei Qunhua.
a) Example for a string of length 5
<source lang="lsl2">
    StringOf5Dec(string test)
    {
        return ( (integer) ("1" + test) >= 100000);
    }
</source>
b) Example for a string of length 1 through 9
<source lang="lsl2">
    VarStringIsDecimal(string test)
    {
        integer limit = (integer) llPow(10.0, llStringLength(test) );
        return ( (integer) ("1" + test) >= limit);
    }
</source>
This function should validate any decimal integer, with or without signs or leading zeroes, and with leading/trailing space but does not accept thousands separators. (Phil Metalhead)
<source lang="lsl2">
    integer uIsInteger(string input)
    {
        input = llStringTrim(input,STRING_TRIM); // remove leading/trailing whitespace
        // "+123" is a valid integer string but would otherwise fail, so strip leading "+" if it's there
        if (llGetSubString(input,0,0) == "+") input = llGetSubString(input,1,-1);
        return ((string)((integer)input) == input);
    }
</source>
Test cases for the above function (click "Expand" link on the right side of the page):
<source lang="lsl2" class="mw-collapsible mw-collapsed">
///////////////
// Returns 1 // (leading and trailing whitespace)
  2352316
///////////////
// Returns 1 // (leading "+")
+151613662
///////////////
// Returns 1 // (negative number)
-263163626
///////////////
// Returns 1 // (largest positive integer)
2147483647
///////////////
// Returns 1 // (largest negative integer)
-2147483648
///////////////
// Returns 1 // (largest positive integer with leading and trailing whitespace, and leading "+")
  +2147483647
///////////////
// Returns 0 // (contains letters)
161362stuff
///////////////
// Returns 0 // (number is a float, not an integer -- contains "." in string)
123.4
///////////////
// Returns 0 // (whitespace in middle of string)
2347
9089
///////////////
// Returns 0 // (contains thousands separator ",")
844,241
// Returns 0 // ("+" in middle of string)
2378+87668
///////////////
// Returns 0 // ("-" in middle of string)
3462098-12
// Returns 0 // (number > 2147483647)
2147483648
///////////////
// Returns 0 // (number < -2147483648)
-2147483649
///////////////
</source>
==Further Reading==
For a more extensive coverage of integers, including the different ways they are used in LSL, see [[LSL_101/LSL_in_Focus:_Integers|LSL in Focus: Integers]].

Revision as of 10:21, 26 September 2023

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