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Read int values from a text file in C

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问题 I have a text file that contains the following three lines: 12 5 6 4 2 7 9 I can use the fscanf function to read the first 3 values and store them in 3 variables. But I can't read the rest. I tried using the fseek function, but it works only on binary files. Please help me store all the values in integer variables. 回答1: A simple solution using fscanf : void read_ints (const char* file_name) { FILE* file = fopen (file_name, "r"); int i = 0; fscanf (file, "%d", &i); while (!feof (file)) {

How to create a Three.js 3D line series with width and thickness?

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问题 Is there a way to create a Three.js 3D line series with width and thickness? Even though the Three.js line object supports linewidth, this attribute is not yet supported in all browsers on all platforms in WebGL. Here's where you set linewidth in Three.js: var material = new THREE.LineBasicMaterial({ color: 0xff0000, linewidth: 5 }); The Three.js ribbon object - which had width - has recently been dropped. The Three.js tube object generates 3D extrusions but - being Bezier-based - the lines

Efficient maths algorithm to calculate intersections

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For a game I am developing I need an algorithm that can calculate intersections. I have solved the problem, but the way I have done it is really nasty and I am hoping someone here might have a more elegant solution. A pair of points represent the end points of a line drawn between them. Given two pairs of points, do the drawn lines intersect, and if so, at what point? So for example call the lines (A.x, A.y)-(B.x, B.y) and (C.x, C.y)-(D.x, D.y) Can anyone think of a solution? A solution in any language will do. Edit: A point I should have made clearer, the algorithm must return false if the

Skip first couple of lines while reading lines in Python file

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I want to skip the first 17 lines while reading a text file. Let's say the file looks like: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 good stuff I just want the good stuff. What I'm doing is a lot more complicated, but this is the part I'm having trouble with. wim Use a slice, like below: with open('yourfile.txt') as f: lines_after_17 = f.readlines()[17:] If the file is too big to load in memory: with open('yourfile.txt') as f: for _ in range(17): next(f) for line in f: # do stuff Ismail Badawi Use itertools.islice , starting at index 17. It will automatically skip the 17 first lines. import itertools

Batch file to delete first 3 lines of a text file

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As the title states I need a batch file to delete the FIRST 3 lines of a text file. for example: A B C D E F G in this example I need A,B and C deleted along with the line This should do it for /f "skip=3 delims=*" %%a in (C:\file.txt) do ( echo %%a >>C:\newfile.txt ) xcopy C:\newfile.txt C:\file.txt /y del C:\newfile.txt /f /q That will re-create the file with the first 3 lines removed. To keep the user updated you could integrate messages in the batch file in vbscript style or output messages in the command prompt. @echo off echo Removing... for /f "skip=3 delims=*" %%a in (C:\file.txt) do (

Batch / Find And Edit Lines in TXT file

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I want to create a batch while which finds specific lines in a batch file and are able to edit these lines. Example: //TXT FILE// ex1 ex2 ex3 ex4 i want to let the batch file find 'ex3' and edit this to 'ex5' to let it look like this: ex1 ex2 ex5 ex4 ghostdog74 On a native Windows install, you can either use batch(cmd.exe) or vbscript without the need to get external tools. Here's an example in vbscript: Set objFS = CreateObject("Scripting.FileSystemObject") strFile = "c:\test\file.txt" Set objFile = objFS.OpenTextFile(strFile) Do Until objFile.AtEndOfStream strLine = objFile.ReadLine If InStr

C# How to skip number of lines while reading text file using Stream Reader?

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问题 I have a program which reads a text file and processes it to be seperated into sections. So the question is how can the program be changed to allow the program to skip reading the first 5 lines of the file while using the Stream Reader to read the file? Could someones please advise on the codes? Thanks! The Codes: class Program { static void Main(string[] args) { TextReader tr = new StreamReader(@"C:\Test\new.txt"); String SplitBy = "----------------------------------------"; // Skip first 5

Count the number of lines in a Java String

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问题 Need some compact code for counting the number of lines in a string in Java. The string is to be separated by \r or \n . Each instance of those newline characters will be considered as a separate line. For example - "Hello\nWorld\nThis\nIs\t" should return 4. The prototype is private static int countLines(String str) {...} Can someone provide a compact set of statements? I have a solution at here but it is too long, I think. Thank you. 回答1: private static int countLines(String str){ String[]

How do I draw lines using XNA?

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问题 I've read a bunch of tutorials involving XNA (and it's various versions) and I still am a little confused on drawing primitives. Everything seems to be really convoluted. Can someone show me, using code, the simplest XNA implementation of drawing one or two lines on to the screen? Perhaps with a brief explanation (including the boilerplate)? I'm not a games programmer and I have little XNA experience. My ultimate goal is to draw some lines onto the screen which I will eventually transform

Lost code lines when Notepad++ crashed

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问题 I was working on a .js file this morning on Notepad++, as usual, when the program just crashed. So I ended it, and re-opened it to see that all my code lines in my .js file, had disappeared, and now all I have left is the file with a size of 0kb because there's nothing left in it. How the hell is that even possible ? It erased everything I typed and saved the file as if there's nothing in it. Do you know a way to get my code back ? Or did something like this ever happened to someone ? :/ I'm