scuf infinity

, programmers are even allowed to construct NaN values with special locating modes (through the Float. intBitsToFloat () method ). For example, programmers can use this customized special location mode in NaN values to express some diagnostic information.Like NaN, the infinite exponent portion of the special value is also 128, but the infinite ending number must all be 0. Infinity is used to express the Overflow problem in computing. For example, when

ECMAScript have values equivalent to these two Boolean values. To convert a value to its corresponding Boolean value, you can call the Transform function Boolean (), for example:var str1= "HI";var strboolean=boolean (STR1);Console.log (Strboolean);//trueYou can call the Boolean () function on a value of any data type, and always return a Boolean value.Various data types and their corresponding conversion rules: Data type The value converted to true Value converted to F

, after the decimal point contains at least one digitvar floatnum=1. -----There is no number after the decimal point, it is resolved to 1var floatnum=11.0------Integer, resolved to 11For large and very small values can be represented by the expression of the floating point in the E-notation, the value of e is equal to the value in front of e multiplied by the exponential power of 10B: The value range, ECMAScript can be represented by the smallest value saved in Number.min_value, in most of the b

1. Using "Use strict" on the top of the script or in the first line of the function will enable strict mode or execute in strict mode2. Define the variable that holds the object and initialize it to null3.null = = Underfined,is true;4.typeof Null,is object;5.typeof is operator, not operand6. When calculating, octal number (starting with 0, if written as 079, then decimal 79), and hexadecimal number (0x), will be converted to decimal7.0.1 + 0.2 = = 0.3,is false; Do not test a specific floating-po

interpreted as hexadecimal numbers.Instancevar y = 0377;var z = 0xFF;Never write 0 in front of the number unless you need to make an octal conversion.By default, JavaScript numbers are displayed in decimal.But you can use the ToString () method to output 16 binary, 8 binary, and 2 binary.Instancevar mynumber=128;Mynumber.tostring (16); Returns 80Mynumber.tostring (8); Returns 200Mynumber.tostring (2); Returns 10000000Infinity (Infinity)When the resul

when they are coerced by a Boolean () type conversionBoth 4:null and undefined do not have the ToString () function.(4) when a Boolean () coercion type is cast, false, "", 0,nan,null,undefined will be converted to false, and the others will be converted to true(5) Number type1: Because the memory space required to save the floating-point value is twice times the integer value, JS automatically converts the floating-point number to the integer type (if possible)2:js in the floating-point operati

words is not OH)"The text between the two slashes forms a direct amount of a regular expression.Direct volume (Regular direct volume, object direct volume, number, string ...) If you are not assigned to a variable, you can use it only once.Solution for rounding Errors: use integer "Points" instead of fractional "tuples" for currency unit-based operations. --P38 (operation in more precise units)Binary floating-point notation does not accurately represent simple numbers like 0.1. --p37Except as a

Beyond the Turing Machine (II)-mysterious and infinite Infinite infinity is mysterious. (1) introduction to the theory of Taiji infinity: Only two Infinity,1. Number of Natural Numbers: A few infinity (∞ 0 ),2. Real Number: Infinite (∞ 1 ),∞ 1 is the ultimate big. There are countless numbers distributed between ∞ 0 and

always follow this line of thinking: I have 4 shards, so it's a very bad idea to use a 4 possible field to do the chip key.Suppose we have an application that stores user information, and each document has a continent field that represents the user's region, and its field values can be "Africa", "Antarctica", "Asia", "Australia", "Europe", "North Ameraica "or" South America ", considering that we have a data center on every continent-perhaps not Antarctica-and want to provide user data for it f

1 digit Numbers are one of the basic data types in javascript. javascript does not distinguish integer and floating-point values. Javascript uses the 64-bit floating format defined in the IEEE 754 standard, basically similar to the double type in Java. Javascript supports direct numeric values: integer values, octal and hexadecimal values, and floating point values. 2. Number object Number object, which is the packaging object of the original value. When necessary, JavaScript will automatically

; Maximum number of extended7) Mincomp = -9.223372036854775807e+18; Minimum comp number8) Maxcomp = 9.223372036854775807e+18; Max Comp numberThe following constants should not be used for comparison relationships, only for allocation. Use the isNaN and isinfinity functions to compare relationships. (provided at the back)9) NaN = 0.0/0.0; Non-number (* $EXTERNALSYM nan*) (* $HPPEMIT ' static const Extended NaN = 0.0/0.0; ' *)Ten) Infinity = 1.0/0.0; Po

1, double Java.lang.Math.floor (double A)Returns the maximum double value (closest to the positive infinity direction) of an integer that is less than or equal to the parameter A in a mathematical sense, special case:If the parameter value equals a mathematical integer, the returned result is the same as the parameter valueIf the parameter is Nan (non-numeric) or infinity or +0 or-0, the return value is the

The following code is a floating-point number divided by 0: float f1=1; float f2=0; float f3=f1/f3; When you see the code above, you may suddenly think of an exception: Dividedbyzeroexception. If these numbers are integers now, they do, but! These are floating-point numbers and do not produce an exception. In fact, floating-point arithmetic never produces an exception, because F2 is not really 0, it's just a very close to 0 number (how many?). In this case, the F3 equals a special value. It is

can detect it through the isNaN () method of the Global object (Gobal). Two Nan howeverValues are not mutually equal. The following example://---------------------------------------------------------Operation and detection of Nan//---------------------------------------------------------VarV1 = ten * ' A ';V2 = ten * ' A ';Document.writeln (isNaN (v1));Document.writeln (isNaN (v2));Document.writeln (v1 = = v2); The Infinity of Global Objects (Gobal)

#define INF 0x3f3f3f3f 0x3f3f3f3f decimal is 1061109567, that is, 10^9 level (and 0x7fffffff (32-bit int maximum) an order of magnitude), and the general situation of the data are less than 10^9, So it can be used as infinity without the case that the data is larger than infinity. On the other hand, since the general data is not greater than 10^9, when we add infinity