Building a differential amplifierAn op-amp and no feedback is already a differential amplifier, amplifying the voltage difference between the inputs. However, its gain cannot be controlled, and it's generally too high to be of any practical use. So far, we application of negative feedback to op-amps have resulting in the practical loss of one of the inputs, the ResU Lting amplifier only good for amplifying
-tag))(defn get-content [data-with-tag] (second data-with-tag))
Add tag to a function that constructs a complex number
(defn make-rect [r i] (attach-tag 'rect (list r i)))(defn make-polar [abs arg] (attach-tag 'polar (list abs arg)))
get-realThe function obtains the tag first, performs different operations according to the Cartesian or polar coordinates
(defn get-real [c] (let [tag (get-tag c) num (get-content c)] (cond (= tag 'rect) (first num) (= tag 'polar) (* (first num)
] (first data-with-tag))(defn get-content [data-with-tag] (second data-with-tag))
Add tag to a function that constructs a complex number
(defn make-rect [r i] (attach-tag 'rect (list r i)))(defn make-polar [abs arg] (attach-tag 'polar (list abs arg)))
get-realThe function obtains the tag first, performs different operations according to the Cartesian or polar coordinates
(defn get-real [c] (let [tag (get-tag c) num (get-content c)] (cond (= tag 'rect) (first num) (= tag '
Use java to create a simple calculator-general Linux technology-Linux programming and kernel information. The following is a detailed description. There are two classes in total. It only completes the +,-, X, and merge operations.
The GUI only uses AWT, which is easy to understand.
Calculator. java
Public class Calculator {
Private String result = "0 ";
Private int op = 0, add = 1, sub = 2, mul = 3, div = 4;
Private double stringToDouble (String x
. Service example
Below I made a simple music playing application, using startService and bindService to start local services respectively.
Activity
[Java]View plaincopyprint?
Public class PlayMusicService extends Activity implements OnClickListener {
Private Button playBtn;
Private Button stopBtn;
Private Button pauseBtn;
Private Button exitBtn;
Private Button closeBtn;
Private Intent intent;
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (save
Copy codeThe Code is as follows:/*QBox. Close (); Close the current windowQBox. iFSrc ({}); changing the properties of the current window and adding the w, h, and src attributes to the Boxy attribute*/// Boxy ExtensionJQuery. fn. qbox = function (options ){Var node = this. get (0). nodeName. toLowerCase ();Var self = this;If (node = 'A '){$ (This). attr ('onclick', ''). unbind ('click'). click (function () {return false ;});Options = $. extend (options | {}, {src: this. get (0 ). getAttribute ('
system plug-in management, select the local installation. The installation is complete and the BI server can be re-started.2. Public API2.1 Login APIWhat is the API interface for login? op=apicmd=bi_loginbi_username=namebi_password=passwordcallback=myfunctionwhere Bi_username=name and Bi_password=password in "name", "password" is the user name and password, on the browser with this API can return a value of "Login success" such as:650) this.width=650
GetAttribute and setAttribute get and set object attributes: functiondocumenttest({{varohtmldocument.doc umentElement; // get lt; html/ gt; element varoHeadoHtml. firstChild; // get lt; head/ gt; varoBod getAttribute and setAttribute get and set object attributes:
Function documentTest (){
Var oHtml = document.doc umentElement; // getElement
Var oHead = oHtml. firstChild; // get
Var oBody = oHtml. lastChild; // get
OBody. setAttribute ("id", "bodyId ");
Alert (oBody. getAttribute ("id "));
}
GetAttribute and setAttribute get and set object attributes:Function documentTest (){Var oHtml = document.doc umentElement; // obtain the Var oHead = oHtml. firstChild; // get Var oBody = oHtml. lastChild; // obtain OBody. setAttribute ("id", "bodyId ");Alert (oBody. getAttribute ("id "));}Create HTML elements:// CreateFunction createNode (){Var oP = document. createElement ("p"); // create a p tagVar sText = document. createTextNode (""); // create a
GetAttribute and setAttribute get and set object attributes:[Javascript]Function documentTest (){Var oHtml = document.doc umentElement; // obtain the Var oHead = oHtml. firstChild; // get Var oBody = oHtml. lastChild; // obtain OBody. setAttribute ("id", "bodyId ");Alert (oBody. getAttribute ("id "));}Create HTML elements:[Javascript]// CreateFunction createNode (){Var oP = document. createElement ("p"); // create a p tagVar sText = document. createTe
type that always returns the number of positive incoming paths.
Performance
Tested the Gjson and the Encoding/json,Ffjson,Easyjson,Jsonparser,and Json-iterator
BenchmarkGJSONGet-8 3000000 372 ns/op 0 B/op 0 allocs/opBenchmarkGJSONUnmarshalMap-8 900000 4154 ns/op 1920 B/
language abstraction layer on top of C is easier to use than C, and the entry threshold is lower.
So how can PHP be executed?
If the word "Translation" is used for conversion from the PHP language to the C language, it is not accurate because the engine does not convert the PHP language to the C language, and then runs the compiled link of the converted C language. When parsing PHP code, the engine is usually divided into two parts: Compile and execute:
Compilation phase: the engine converts
Title Link: http://acm.hdu.edu.cn/showproblem.php?pid=3397Test instructions: Given n number, consisting of 0, 1. There are 5 types of operations. Enter 3 numbers per operation, Op,a,b.
Op = = 0, the interval [a, b] is assigned a value of 0;
op = = 1, the interval [a, b] is assigned a value of 1;
OP = =
);}voidUpdateintPintSintEintLintRintVintOP) {if(S >= l e if(OP = =1)//Add all values of [l,r] interval to v{Add[p] + = V; Minv[p] + = V; Maxv[p] + = V; }Else if(OP = =2)//change all values greater than V in the [l,r] interval to v{Maxv[p] = min (maxv[p], V); Minv[p] = min (minv[p], V); }Else //op = 3 changes all values less than V in th
understanding of transactions mainly comes from the database, which is a batch operation. Record your operation set and then process it all at once, ensures the security and efficiency of transactions. FragmentManager also holds the same view of transactions. The core method of BackStackRecord is addOp (Op ):
void addOp(Op op) { if (mHead == null) {
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