parent-child | 易学教程

How to get return value from child process to parent?

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问题 I'm supposed to return the sum of first 12 terms of Fibonacci series from child process to parent one but instead having 377 , parent gets 30976 . #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <sys/types.h> #include <sys/wait.h> int main(int argc, char *argv[]) { pid_t childpid; int i, fib_sum=0, fib1=1, fib2=1, temp, status; childpid=fork(); if(childpid!=0) { wait(&status); fprintf(stderr, "%d\n", status); } else { for(i=1; i<=12; i++) { temp=fib1; fib_sum=fib1+fib2;

Set the width of children to fill the parent

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问题 I want the children of the div fill its width. now am using a code like this: .parent { width: 100%; display: inline-block; height: 120px; background: #000; padding: 10px; box-sizing: border-box; } .child { display: inline-block; margin-left: 1%; width: 31.4%; height: 100px; background: #ddd; } <div class="parent"> <div class="child"></div> <div class="child"></div> <div class="child"></div> </div> and it's working for 3 boxes , but what I want is that - Even if the box count is one or two i

How pass a event from deep nested child to parent in Angular 2?

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问题 I have a nested child component that have a output Event, I want listen this event from parent component but I dont know how, I have 4 levels: I tried to pass the event from child 3 to child 2 and child 2 to child and to Parent, but I think that this is not the best way. -Parent (From this I want listen the event) --Child ----Child 2 ------Child 3 (This have the Event) 回答1: Source Dan Wahlin (ng-conf: Mastering the Subject: Communication Options in RxJS ), it's not recommanded to use OutPut

JPA @OneToMany -> Parent - Child Reference (Foreign Key)

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i have a Question about referencing ParentEntities from Child Entites ir If i have something like this: Parent.java: @Entity(name ="Parent") public class Parent { @Id @Generate..... @Column private int id; @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "parent") private Set<Child> children; simple ... getter and setter ... } And the Child.java: @Entity(name ="Child") public class Child{ @Id @Generate.... @Column private int id; @ManyToOne private Parent parent; ... simple getter an setter } Following Tables are going to be created: Parent: int id Child: int id int

Cross browser method to fit a child div to its parent's width

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I'm looking for a solution to fit a child div into it's parent's width . Most solutions I've seen here are not cross-browser compatible (eg. display: table-cell; isn't supported in IE <=8 ). The solution is to simply not declare width: 100% . The default is width: auto , which for block-level elements (such as div ), will take the "full space" available anyway (different to how width: 100% does it). See: http://jsfiddle.net/U7PhY/2/ Just in case it's not already clear from my answer: just don't set a width on the child div . You might instead be interested in box-sizing: border-box . You can

jQuery - selecting elements from inside a element

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let's say I have a markup like this: <div id="foo"> ... <span id="moo"> ... </span> ... </div> and I want to select #moo. why $('#foo').find('span') works, but $('span', $('#foo')); doesn't ? You can use any one these [starting from the fastest] $("#moo") > $("#foo #moo") > $("div#foo span#moo") > $("#foo span") > $("#foo > #moo") Take a look Actually, $('#id', this); would select #id at any descendant level, not just the immediate child. Try this instead: $(this).children('#id'); or $("#foo > #moo") or $("#foo > span") Why not just use: $("#foo span") or $("#foo > span") $('span', $('#foo'));

Height of parent div is zero even if it has child with finite heights

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I have a website whose layout has been shown in the diagram. The body consists of a main container , which comprises of header , parent div and footer . The parent div further contains several child div as shown. The problem being height of all the child div is finite. But the parent div contains nothing other than the child divs. All the child divs are visible but the height of the parent div is shown to be zero. I am also not fixing the height of the parent div by giving some pre-specified value as it may cause blunder if number of child increases in future. The problem due to zero size of

Is it legal to have children of an anchor tag (<a>) in HTML?

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问题 Is it legal to have children of an anchor tag in HTML? For an example: <a> <font>Example</font> <img src="example.jpg"/> </a> It works fine in the browsers.But is it valid? Please help 回答1: Yes - even more so with the advent of HTML 5 (From the spec): Although previous versions of HTML restricted the a element to only containing phrasing content (essentially, what was in previous versions referred to as “inline” content), the a element is now transparent; that is, an instance of the a element

How do I enable Parts/Components in Unity C# with only a game object in the script

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I am using Photon to make put multiplayer in my game, to ensure that one player doesn't control them all, when you spawn in, client side it will activate your scripts/camera so you can see and move. Although I can't think of a way around this problem, since I don't know how to enable/disable children's components or enable a child's child. I want to enable this through scripting http://imgur.com/ZntA8Qx and this http://imgur.com/Nd0Ktoy My script is this: using UnityEngine; using System.Collections; public class NetworkManager : MonoBehaviour { public Camera standByCamera; // Use this for

PHP: Loop through multidimensional array and establish parent-child relationships between array items

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问题 I am developing a content management system and I have run into an issue with child-parent relationships of items in the CMS. Basically I have a system that can create pages and when a page is created you can select a parent page for sub-navigation. This is all fine and dandy until I try to generate the navigation from the DB. I'm not sure if some sort of join would be better but I prefer to get all the data in an array and manipulate the array with php. My array of results from the DB is