memory.Of the 8 basic data types, only char and Boolean are unsigned numbers. and the value range of the Boolean type is 0 or the range of 1,char type is [0,65535]. We generally think that the value of the char type is non-negative.The floating-point type of Java is in IEEE 754 floating-point number format. In the case of float, floating-point types typically have two 0,+0.0f and -0.0f. The former is 0 in Java, the latter is a floating-point number with a sign bit of 1 and the other bits are 0,
The following are the most basic data type comparisons.650) this.width=650; "src=" Http://www.grabsun.com/uploads/images/201206-2/144721_08_738.GIF "alt=" 144721_08_738. GIF "/>Explain the points:1. It can also be divided into two main categories: Boolean and numeric (mainly for data conversion)(Note that Boolean cannot be converted with other types, and it is not possible to assign a Boolean to a type such as int)A 2.String string is not a basic data type, a string is a class, that is, a refere
) type in the IEEE standard. This means that number causes the following precision rounding error:
1
0.1 + 0.2 = = 0.3//false
Because integers and floats are no different, unlike C # and Java, the following code is true:
1
0.0 = = 0; True
Finally, a question about number, how do we implement the following question:
1 2
A = = = B; True 1/a = = 1/b; False
The answer is that the specification of number is allowed to ap
63px 63px 63px/108px 108px 72px 72px;border-radius:50% 50% 50% 50%/60% 60% 40% 40%;}
Infinity symbol:The infinity symbol can be achieved by border the property and setting the angle of the pseudo-element.#infinity {width:220px;height:100px;position:relative;}#infinity: Before, #
= 666;int64 Longvalue = 2147483648; Single Floatvalue = 3.14f;double Doublevalue = 999.99;decimal Decimalvalue = 86400.35627m;In JavaScript there is only one numeric type, the number type, which includes integers and floating-point numbers.There are 3 special representations of the number types of javascript:
Inifiity: Infinity of Positive
-inifity: Negative Infinity
NaN: Non-numeric (not
;Float f2 = 0;Float f3 = f1/f2;If you see the above Code, will you immediately think of DividedByZeroException. If these numbers are integers, an exception is thrown, but these numbers are floating-point numbers, and no exception is thrown here,In fact, floating-point calculation never produces exceptions, because f2 is not really 0, it is just a number very close to 0 (For details, refer to my previous article ). In this case, f3 is equal to a special value. It is
than or equal to 2 of the 53 can be accurately represented. An operation with a value greater than 2 after 53 will begin to appear in error. The number of valid digits (the last three bits of 111) will not be saved and become 0.Special values:One, positive 0 and minus 01. In strict terms, JavaScript provides 0 of the three kinds of notation: 0, +0,-0. They are equivalent.2. If positive 0 and negative 0 are used as the denominator of the divisor, the result is different.+0--〉+
(""); // The NaN character ''cannot be converted to the number var num3 = parseInt (" 0xA "); // A var num4 = parseInt (22.5) in hexadecimal notation of 10-hexadecimal ); // 22 var num5 = parseInt ("70"); // 70-decimal var num6 = parseInt ("0xf"); // 15 hexadecimal value: 15
8. Use of Number objects
Var num1 = Number ("Hello world! "); // NaN var num2 = Number (" "); // 0 empty strings can be converted to 0. The parseInt () is not the same as var num3 = Number (" 000011 "); // 11 var num4 = N
code
Var demo = 1; // This is the Number typeDemo = true; // This Is A Boolean typeDemo = "Hello"; // This is String typeVar;C = new function () {var a = 1; alert (typeof ());};Alert (typeof ());
Result: number, undefined;
The Code is as follows:
Copy code
Var a = 1;C = new function () {alert (typeof (a); var a = 1 ;};Alert (typeof ());
Result: undefined, number;
The Code is as follows:
Copy code
Var;C = new function () {a
; otherwise, the value is true.
2.2 because the Number is implemented using a double-precision floating point Number, the following situation is reasonable:
0.1 + 0.2 // 0.30000000000000004
3. Math
The following method is similar to the static method of the Math class in Java.
Math.pi // 3.141592653589793
Math. cos (Math. PI) //-1
3.1 convert the string into numbers: parseInt and parseFloat methods:
ParseInt ("123") = 123 (decimal conversion)
ParseInt ("010") = 8 (octal conversion)
ParseInt ("0
:=Min (α, minimax (child, depth-1))//If it is our turn to moves, is the maximal node, choose one of the best scoring methodselse {wearetoplayatnode} let Α:=-∞ foreachchildofnode α:=max (Α,minimax (Child , depth-1 returnα; A more specific algorithm:the evaluation of the int minmax (int depth) { // function is evaluated in terms of white. If(Sidetomove ()==White) {//White is the "biggest" person ReturnMax (depth);}Else{//Black is the "smallest" person ReturnMin (depth);}}IntMa
classDepthpagetransformerImplementsViewpager.pagetransformer {private static final floatMin_scale=0.75f;Public voidTransformpage (View view,floatPosition) {intPageWidth = View.getwidth ();if(Position 1) {//[-infinity,-1]//This page was the off-screen to the left. View.setalpha (0); }else if(Position 0) {//[ -1,0]//Use of the default slide transition when moving to the left page View.setalpha (1); View.settranslationx (0); View.s
(i) JavaScript type1. JavaScript data types have a total of 6 in the ES5 Standard: Numbers, strings, Booleans, null,undefined, objects. The first five are known as primitive types, and objects are object types. Objects also include our commonly used arrays and functions.2. The original data type of Javasript is generally not changed, but the object type can be changed.(ii) Number1. Integral Type Direct Quantity(1) ES supports decimal and hexadecimal. Where hexadecimal starts with ' 0x ' or ' 0X
I. Method of type conversion and precautions: 1. Convert to boolean: ( 1 ) Using two non-operations (!) : !! 5 ==> true ( 2 ) Use a Boolean constructor: New Boolean (5) ==> true Convert value to boolean type False : 0 , + 0 , -0 , Nan , ""( Null String ), Undefined, null Other values except the preceding values are converted True Which of the following is important? : "0", new object (), function (){}2. Convert to string type: ( 1 ) Add a Null String "" :
building into the predictions of the generals. Soon, Russell's Paradox)[13]It has shaken the foundation of mathematics-set theory, triggering the third crisis in the history of mathematics. People are frustrated to find that the accuracy and certainty of reason are not only lost in physics, but not even in mathematics. What makes scientists even more embarrassed is that their arguments finally inevitably go beyond the scope of science or mathematics and enter the field of philosophy. The philos
address of interface is sent instead of network prefix, as is required by mobile devices 6. when set, minimum limits specified by mobile IPv6 are used for minrtradvinterval and maxrtradvinterval.
Default: Off
AdvvalidlifetimeSeconds |
Infinity
The length of time in seconds (relative to the time the packet is sent) that the prefix is valid for the purpose of on-link determination. The symbolic valueInfinityRepresents
AttributesAttribute description
Constructor returns a reference to the Number function that creates this object.
MAX_VALUE indicates the maximum number.
MIN_VALUE represents the smallest number.
NaN is a non-numeric value.
NEGATIVE_INFINITY is negative infinity. This value is returned when overflow occurs.
POSITIVE_INFINITY is positive infinity. This value is returned when overflow occurs.
Prototype enable
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