size | 易学教程

How could it be possible to read and write past the array

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问题 Output of the program: #include <stdio.h> int main() { int size; printf("Enter the size of array: "); scanf("%d",&size); int b[size],i = 0; printf("Enter %d integers to be printed: ",size); while(i++ < size) { scanf("%d",&b[i]); printf("%d %d\n", i, b[i]); } return 0; } for size = 5 and input numbers : 0 1 2 3 4 is 1 0 2 1 3 2 4 3 5 4 where first column is for i and second for elements of array b . It is clear that i in the loop while(i++ < size) { incremented to 1 before entering the loop.

函数指针数组的最佳实践

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1 #include<iostream> 2 #include<fstream> 3 #include<string.h> 4 using namespace std; 5 6 class Student; 7 8 typedef void(CALL)(Student*,int); 9 10 class Student 11 { 12 public: 13 string name; 14 int age; 15 char sex; 16 public: 17 Student(){} 18 ~Student(){} 19 }; 20 21 void write_object(Student *students,int size) 22 { 23 ofstream ofs("text.bat"); 24 if(ofs) 25 { 26 for(int i=0;i<size;i++) 27 { 28 cin>>students[i].name>>students[i].age>>students[i].sex; 29 ofs.write(reinterpret_cast<const char*>(&students[i]),sizeof(students[i])); 30 } 31 } 32 else 33 { 34 cout<<"write failed"<<endl; 35 } 36

Using GhostScript to get page size

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Is it possible to get the page size (from e.g. a PDF document page) using GhostScript? I have seen the "bbox" device, but it returns the bounding box (it differs per page), not the TrimBox (or CropBox) of the PDF pages. (See http://www.prepressure.com/pdf/basics/page_boxes for info about page boxes.) Any other possibility? Meanwhile I found a different method. This one uses Ghostscript only (just as you required). No need for additional third party utilities. This method uses a little helper program, written in PostScript, shipping with the source code of Ghostscript. Look in the toolbin

How to double the size of a matrix and propagate its elements in Matlab?

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问题 suppose I have a matrix like this: a = 1 2 3 4 I want to double the size of matrix and create something like this: aa = 1 1 2 2 1 1 2 2 3 3 4 4 3 3 4 4 in this way, each element in the first matrix propagates to four elements in the bigger matrix. a(i,j) == aa(2*i-1, 2*j-1) == aa(2*i , 2*j-1) == aa(2*i-1, 2*j) == aa(2*i , 2*j) is there any predefined functions to do that? definitely I can do that by two loops, but I want the easiest and cleanest way! 回答1: use kron - Kronecker tensor product:

Why does the calculated width and height in pixel of a string in Tkinter differ between platforms?

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I have a Python script which needs to calculate the exact size of arbitrary strings displayed in arbitrary fonts in order to generate simple diagrams. I can easily do it with Tkinter. import Tkinter as tk import tkFont root = tk.Tk() canvas = tk.Canvas(root, width=300, height=200) canvas.pack() (x,y) = (5,5) text = "yellow world" fonts = [] for (family,size) in [("times",12),("times",24)]: font = tkFont.Font(family=family, size=size) (w,h) = (font.measure(text),font.metrics("linespace")) print "%s %s: (%s,%s)" % (family,size,w,h) canvas.create_rectangle(x,y,x+w,y+h) canvas.create_text(x,y,text

琐碎内容

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尺寸问题： iPhone应用程序图标大小：57*57; iPhone全屏UIView大小：320*460 添加UITabBar后大小：320*411 UITabelViewCell默认大小: 320*44 绘制控件方法 //--alloc -(UITextField *)GetDefaultTextField:(CGRect)frame{ UITextField *textField=[[UITextField alloc] initWithFrame:frame]; textField.borderStyle=UITextBorderStyleRoundedRect; textField.font=[UIFont fontWithName:@"Arial" size:12.0]; textField.textAlignment=UITextAlignmentCenter; textField.contentVerticalAlignment=UIControlContentVerticalAlignmentCenter; textField.keyboardType=UIKeyboardTypeNumbersAndPunctuation; textField.returnKeyType=UIReturnKeyDone; textField.delegate=self;

How to keep a <div> constant in size as the user zooms in and out on the page?

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问题 Is there an html / css / javascipt way to maintain a <div> at a constant size in the face of the user's zooming the page in and out? That is, using control-plus to increase text size and control-minus to reduce it. EDIT: The kicker, I guess, is that I want the content of the <div> to stay the same size, too. Thanks! EDIT: My goal was (and is) to keep an AdSense <div> from expanding so much as to obscure a lot of the real content on the page. But come to find out (thank you @thirtydot) there's

How to get total RAM size of a device?

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I want to get full RAM size of a device. memoryInfo.getTotalPss() returns 0. There is not function for get total RAM size in ActivityManager.MemoryInfo . How to do this? Standard unix command: $ cat /proc/meminfo Note that /proc/meminfo is a file. You don't actually have to run cat , you can simply read the file. Leon Lucardie As of API level 16 you can now use the totalMem property of the MemoryInfo class. Like this: ActivityManager actManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); ActivityManager.MemoryInfo memInfo = new ActivityManager.MemoryInfo();

Determine the size of an InputStream

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My current situation is: I have to read a file and put the contents into InputStream . Afterwards I need to place the contents of the InputStream into a byte array which requires (as far as I know) the size of the InputStream . Any ideas? As requested, I will show the input stream that I am creating from an uploaded file InputStream uploadedStream = null; FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); java.util.List items = upload.parseRequest(request); java.util.Iterator iter = items.iterator(); while (iter.hasNext()) { FileItem

(转)List.subList带来的ConcurrentModificationException异常

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下面内容主要转自下面两篇博文 https://www.jianshu.com/p/59ca14497a12 https://www.jianshu.com/p/d2a69f7dc563 ArrayList$SubList.size方法,如果原List和SubList的modCount不相等就会报错先贴demo public static void main(String[] args) { List<Integer> list1 = new ArrayList<Integer>(); list1.add(1); list1.add(2); //通过subList生成一个与list1一样的列表 list3 List<Integer> list3 = list1.subList(0, list1.size()); /** 修改list1 ,也可能是多线程情况下其他线程调用了list1这个实例的add,sort，remove等方法**/ list1.add(3); System.out.println("list1'size：" + list1.size()); System.out.println("list3'size：" + list3.size()); } 第二句输出list3.size()就会报这个异常了。原因是 ArrayList.subList()