Java Replace Line In Text File

At the bottom, I have a general solution to replace lines in a file. But first, here is the answer to the specific question at hand. Helper function: public static void replaceSelected(String replaceWith, String type) { try { // input the file content to the StringBuffer “input” BufferedReader file = new BufferedReader(new FileReader(“notes.txt”)); StringBuffer inputBuffer … Read more

Reading a file line by line in C#

You can write a LINQ-based line reader pretty easily using an iterator block: static IEnumerable<SomeType> ReadFrom(string file) { string line; using(var reader = File.OpenText(file)) { while((line = reader.ReadLine()) != null) { SomeType newRecord = /* parse line */ yield return newRecord; } } } or to make Jon happy: static IEnumerable<string> ReadFrom(string file) { string … Read more

How do I compute the intersection point of two lines?

Unlike other suggestions, this is short and doesn’t use external libraries like numpy. (Not that using other libraries is bad…it’s nice not need to, especially for such a simple problem.) def line_intersection(line1, line2): xdiff = (line1[0][0] – line1[1][0], line2[0][0] – line2[1][0]) ydiff = (line1[0][1] – line1[1][1], line2[0][1] – line2[1][1]) def det(a, b): return a[0] * … Read more

Draw a connecting line between two elements [closed]

jsPlumb is an option available that supports drag and drop, as seen by its numerous demos, including the Flowchart demo. It is available in a free Community edition and a paid Toolkit edition. The Toolkit edition wraps the Community edition with a comprehensive data binding layer, as well as several UI widgets for building applications … Read more

C read file line by line

If your task is not to invent the line-by-line reading function, but just to read the file line-by-line, you may use a typical code snippet involving the getline() function (see the manual page here): #define _GNU_SOURCE #include <stdio.h> #include <stdlib.h> int main(void) { FILE * fp; char * line = NULL; size_t len = 0; … Read more