concatenation

How to concat two char * in C?

由 北慕城南 提交于 2019-12-01 03:33:07
I receive a char * buffer which have the lenght of 10. But I want to concat the whole content in my struct which have an variable char *. typedef struct{ char *buffer; //.. }file_entry; file_entry real[128]; int fs_write(char *buffer, int size, int file) { //every time this function is called buffer have 10 of lenght only // I want to concat the whole text in my char* in my struct } Something like this : real[i].buffer += buffer; How can I do this in C ? In general, do the following (adjust and add error checking as you see fit) // real[i].buffer += buffer; // Determine new size int newSize =

how can I concatenate two arrays in javascript?

由 你离开我真会死。 提交于 2019-12-01 03:06:35
问题 I saw this response for extending one array with another so I tried: console.log(['a', 'b'].push.apply(['c', 'd'])); but it prints: 2 shouldn't it print: ['a', 'b', 'c', 'd'] if not what was i doing wrong? 回答1: if not what was i doing wrong? First of all, .push returns the new length of the array: var arr = [1, 1, 1]; console.log(arr.push(1)); // 4 console.log(arr); // [1, 1, 1, 1] Second, .apply needs two arguments: The object you want to apply the function to, and an array of arguments. You

What is the usage of adding an empty string in a javascript statement

由 拈花ヽ惹草 提交于 2019-12-01 02:46:53
问题 I see an empty string ( '' or "" ) used in many JavaScript statements but not sure what does it stand for. e.g. var field = current.condition_field + ''; Can someone please clarify? 回答1: Type Casting . It converts the type to string If variable current.condition_field is not of string type, by adding '' using + operator at the end/beginning of it converts it to string . var field = current.condition_field + ''; So, field is always string . Example var bool = true; // Boolean var str = bool +

Accomplishing MYSQL's Group_Concat in SQL Server [duplicate]

由 杀马特。学长 韩版系。学妹 提交于 2019-12-01 02:08:51
问题 This question already has answers here : How to concatenate text from multiple rows into a single text string in SQL server? (47 answers) Closed 6 years ago . I'm porting an application I originally wrote to run on Apache using PHP and a MySQL database. One of the queries used the MySQL functions of Concat_WS and Group_Concat to first concatenate a few different columns into one string, and then concatenate all items that were grouped together by the Group_By clause. As an example: ID Name

Best practice for building file paths in C#

由 时间秒杀一切 提交于 2019-12-01 02:06:33
I'm working on a C# project where I must build paths to various files and folders. These are all under one root folder which I have specified in my Web.config file. For example: "start with: "D:\builds\" from my Web.config Pass to GetRelativePath() to get "D:\builds\5.2\5.2.9751" Then pass to GetAutoSuitePath() to get "D:\builds\5.2\5.2.9751\AutoSuite\" Then pass to ParseBrLog which will read "D:\builds\5.2\5.2.9751\AutoSuite\AASanity.csv" My paths are correct, but I just want to know what the best practice is for incomplete paths. Should I add a "\" to the end of every folder ("D:\Builds\5.2\

Concatenating Matrices in R

由 你说的曾经没有我的故事 提交于 2019-12-01 02:03:10
How can I concatenate matrices of same columns but different number of rows? For example, I want to concatenate a ( dim(a) = 15 7000 ) and b (dim(b) = 16 7000) and I want the result to be a matrix of 31 rows by 7000 columns. Can I do this for matrices of different rows and columns.? Say I want to combine a matrix of 15 rows and 7000 columns with another of 16 rows and 7500 columns. Can I create one dataset with that? Sounds like you're looking for rbind : > a<-matrix(nrow=10,ncol=5) > b<-matrix(nrow=20,ncol=5) > dim(rbind(a,b)) [1] 30 5 Similarly, cbind stacks the matrices horizontally. I am

Javascript - set a variable using concatenation of strings [duplicate]

由 白昼怎懂夜的黑 提交于 2019-12-01 02:02:29
问题 This question already has answers here : Use dynamic variable names in JavaScript (15 answers) Closed 6 years ago . Is it possible to set a variable by concatenating two strings together to form the name? If at all possible I'd like to determine what variable to set based on the class names of the objects that the user clicks. I know I can hard code a bunch of if/else if statements, but it would be really cool if I could reference the variables indirectly. I was thinking something like this:

Excel “UnCONCATENATE”/explode in function / Convert cell into array

由 落爺英雄遲暮 提交于 2019-12-01 01:18:09
I am trying to "Unconcatenate" a string in Excel 2010. Yes, I know that is not a real word. So pretty much; I have a cell that can not be split into multiple columns the cell looks like this: Item 1, Item 2, Item 3 Now this cell may have 0-? items. I am wanting to compare that one cell against a column in another sheet. I believe I would need to use the match function to do this, but I need that first cell to be converted into an array in a function with the delimiter as the comma. So far I have =MATCH( Each item in cell , SHEET2!A:A, 0) Any help would be nice. I am aware of =Left and =Right,

SQL Server : Group by string concatenation

由 独自空忆成欢 提交于 2019-12-01 00:53:00
I have a question. I know that has been asked before. I looked through the related questions but I could not get my SQL script to work. Here is my query : SELECT T1.PART_ID, T2.ID, T2.DESCRIPTION FROM #TEMP T1 INNER JOIN #TEMP2 T2 ON T1.PART_ID = T2.PART_ID ORDER BY T2.ID Table: PART_ID | ID | DESCRIPTION ---------------------------------- 10002 | 1182505 | Tagfahrlichtschaltung 80029 | 1182505 | Bluetooth 20004 | 1212866 | Kindersitzbefestigung 10045 | 1212866 | Lederlenkradrriegelung 11908 | 1257946 | Airbag 22346 | 1257946 | Automatic I want have the result like: ID | LISTOFPARTS ----------

How to concat two char * in C?

由 随声附和 提交于 2019-12-01 00:18:17
问题 I receive a char * buffer which have the lenght of 10. But I want to concat the whole content in my struct which have an variable char *. typedef struct{ char *buffer; //.. }file_entry; file_entry real[128]; int fs_write(char *buffer, int size, int file) { //every time this function is called buffer have 10 of lenght only // I want to concat the whole text in my char* in my struct } Something like this : real[i].buffer += buffer; How can I do this in C ? 回答1: In general, do the following
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