Flash / Flex / ActionScript/Data Type/int
Содержание
- 1 An example of a for statement that outputs the numbers from 0 to 999
- 2 Combining operators with assignment will use the left-hand side of the expression as the first operand
- 3 Contains reusable methods for operations pertaining to int values
- 4 Creates a variable named width, of type int, and assigns it the value 25
- 5 Display a sequence of square roots
- 6 Include the number variable in a string expression. This will implicitly convert the number to a String.
- 7 parseInt(): interpret the text as a number in an arbitrary base.
- 8 The int type is perfect for counters, and is frequently found in for loops:
- 9 toExponential()
- 10 toFixed()
- 11 toPrecision()
- 12 Use int() to convert string to integer
- 13 You can also use exponential notation to declare numbers.
An example of a for statement that outputs the numbers from 0 to 999
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ for (var i:int = 0; i < 1000; i++) { trace(i); } trace ("That"s the end."); } }
}
</source>
Combining operators with assignment will use the left-hand side of the expression as the first operand
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ var a=10; a = a + 10; //can be more concisely written as a += 10; } }
}
</source>
Contains reusable methods for operations pertaining to int values
<source lang="java">
package com.adobe.utils {
import flash.utils.Endian; /** * Contains reusable methods for operations pertaining * to int values. */ public class IntUtil { /** * Rotates x left n bits * * @langversion ActionScript 3.0 * @playerversion Flash 9.0 * @tiptext */ public static function rol ( x:int, n:int ):int { return ( x << n ) | ( x >>> ( 32 - n ) ); } /** * Rotates x right n bits * * @langversion ActionScript 3.0 * @playerversion Flash 9.0 * @tiptext */ public static function ror ( x:int, n:int ):uint { var nn:int = 32 - n; return ( x << nn ) | ( x >>> ( 32 - nn ) ); } /** String for quick lookup of a hex character based on index */ private static var hexChars:String = "0123456789abcdef"; /** * Outputs the hex value of a int, allowing the developer to specify * the endinaness in the process. Hex output is lowercase. * * @param n The int value to output as hex * @param bigEndian Flag to output the int as big or little endian * @return A string of length 8 corresponding to the * hex representation of n ( minus the leading "0x" ) * @langversion ActionScript 3.0 * @playerversion Flash 9.0 * @tiptext */ public static function toHex( n:int, bigEndian:Boolean = false ):String { var s:String = ""; if ( bigEndian ) { for ( var i:int = 0; i < 4; i++ ) { s += hexChars.charAt( ( n >> ( ( 3 - i ) * 8 + 4 ) ) & 0xF ) + hexChars.charAt( ( n >> ( ( 3 - i ) * 8 ) ) & 0xF ); } } else { for ( var x:int = 0; x < 4; x++ ) { s += hexChars.charAt( ( n >> ( x * 8 + 4 ) ) & 0xF ) + hexChars.charAt( ( n >> ( x * 8 ) ) & 0xF ); } } return s; } }
}
</source>
Creates a variable named width, of type int, and assigns it the value 25
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ var width:int = 25; trace(width); } }
}
</source>
Display a sequence of square roots
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ for (var i:Number = 50; i > 2; i = Math.sqrt(i)) { trace(i); } } }
}
</source>
Include the number variable in a string expression. This will implicitly convert the number to a String.
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ for (var i:int = 99; i > 0; i--) { trace(i + "bottles of beer on the wall"); } } }
}
</source>
parseInt(): interpret the text as a number in an arbitrary base.
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ trace(parseInt("3.14")); // 3 } }
}
</source>
The int type is perfect for counters, and is frequently found in for loops:
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ for (var i:int = 0; i < 1000; i++){ } } }
}
</source>
toExponential()
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ var x = 2 / 3; trace(x.toExponential());
} }
}
</source>
toFixed()
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ var x = 2 / 3; trace(x.toFixed()); } }
}
</source>
toPrecision()
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ var x = 2 / 3; trace(x.toPrecision("3"));
} }
}
</source>
Use int() to convert string to integer
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ trace(int("3.14")); // 3 } }
}
</source>
You can also use exponential notation to declare numbers.
<source lang="java">
package{
import flash.display.Sprite; public class Main extends Sprite{ public function Main(){ 2.007e3; // 2007 1414e-3; // 1.414 1.9e+17; // 190,000,000,000,000,000 } }
}
</source>