I wanted to know if there was a way to separate the inputs received if there were a few keyboards and mice hooked up to a desktop/laptop.
Would there be a particular class that would best be utilized to do this?
I read that MouseEventArgs is one class that can recognize events, but I'm not sure if its best for what I need.
so i have to read a text file with an unknown number of lines and allocate memory to for the number of items in the text file.currently i read the entire file(counting the number of lines). i allocate memory according to the number of lines read and then use fseek() with an offset of zero to allow for the second read .
View 5 Replies View RelatedI am beginner at C and I was working on a program where I have to read in a line such as Digit, String, Float. The string can have any amount of spaces between it. and each input is separated by a space character.
The input is of the format:
10000000000 hello my n ame is 30.2
So I used fgets(x,100,stdin) to read the line in.
So I need to read that line into an int, array, and float.. so I was thinking of using this:
sscanf(x, "%d %[^/n] %f", &number, &username, &numberfloat);
Now, obviously I can't use the /n to read in the username with spaces because I need to read the 30.2 into a float variable.
<?xml version="1.0" encoding="ISO-8859-1" ?>
<packets_summary>
<item>
<index>1</index>
<frame_type>Ethernet</frame_type>
<local_mac_address>00-21-85-11-29-1b</local_mac_address>
[Code] ....
I am having trouble to read all attributes in all nodes called "item". I can load all attributes in one node "item" but I can't move to another node called "item " and load another attributes . I was trying a lot of different codes but I did not succsed.
for (pugi::xml_node node = doc.child("packets_summary").child("item").first_child(); node; node = node.next_sibling()) { cout << node.name() << ": " << node.child_value() << endl; }
This code just print all of the attributes in node called "item" but i need to move to another one and I really don't know how. I was trying to put into one for cycle another one but it did not work.
for (pugi::xml_node node = doc.child("packets_summary").child("item").first_child(); node; node = node.next_sibling()) { cout << node.name() << ": " << node.child_value() << endl; }
for (pugi::xml_node node = doc.child("packets_summary").child("item").first_child(); node; node = node.next_sibling()) {
cout << node.name() << ": " << node.child_value() << endl;
}
I want to know how to read multiple text files in this program... I have 5 text files(order1,order2,...order5).
#include<iostream.h>
#include<fstream.h>
#include<conio.h>
#include<windows.h>
using namespace std;
class{
[Code] ....
I'm currently working on a server for handling clients in a 2d online game and I wrote some regular fstream file code for handling the file that stores their information and I was about to implement it into the server, then I realized there might be a problem having it open multiple times concurrently, so I googled it and came up with
posts like
[URL]
I'm wondering if I can just treat it like everything else or will I have to do something specific for opening on multiple threads?
p.s. I did read those posts but I'm very new to multithreading
So I have this text file that I am trying to read from and store the values of each line in multiple variables.
Let's say my text file contains
AXSYZ3482 Tom 100 112
and my code below here works fine when the lines in the text file is separated by spaces.
while (fscanf(fp, "%s %s %d %d
", userID, name, &startLoc, &endLoc) != EOF) {
printf("%s %s %d %d
", userID, name, startLoc, endLoc);
}
But let's say my file was to look like this instead.
AXSYZ3482:Tom:100:112
But if i try this below...
while (fscanf(fp, "%s:%s:%d:%d
", userID, name, &startLoc, &endLoc) != EOF) {
printf("%s %s %d %d
", userID, name, startLoc, endLoc);
}
It seem to store the entire line in userID including the ":". I want to ignore the ":"'s and store everything in between in respective varibles in the order specified above.
So first string in userID, then ignore the :, then second string in name, and ignore the next :, and so forth. How I can accomplish this?
I want to read a string of unknown length from stdin. I tried to follow the approach from this link.
[URL]....
My code is like this:
Code:
#include <iostream>
#include <string>
using namespace std;
int n;
cin >> n;
cout << "The value of n is " << n << endl;
string str;
getline(cin, str);
cout << "The entereed string is " << str << endl;
What I have noticed is that if I take integer input from cin (cin >> n in the above code before getline, the control does not stop on getline to take str as input from the console. If I don't do (cin >> n) before getline then the control stops on getline and takes the string as input.
What is the best way to read from console multiple strings of unknown length in combination with the integers?
I've been stuck on this for hours, and have scoured the internet for any insight on this particular issue with no luck.
I'll simplify the problem here. I have a lines in an input file:
John Smith 1234 Main St New York
Carol Thomas 5678 5th Ave Columbus
...
and I am reading into character arrays using code like this:
infile.getline(name,20);
infile.getline(street,15);
infile.getline(city,10);
but when I print the output using something like this:
outfile << "Owner Name: " << name << endl;
outfile << "Address: " << street << city << endl;
(let's pretend I included spaces between the address components, which I omitted to save space)
I get an output file of:
Owner Name: John Smith
Address:
The output stops after the name variable, which I believe is stored correctly. I don't think anything is storing in the address pieces, this is the problem.
I think it's because I'm not using getline() properly in this case. Can you string together multiple getline()s like that?
If this was my design, I'd read in strings instead, but that is not possible in this case.
So I have to write a code for my C++ class, and I am having a problem trying to figure out how to get my code to read multiple int values. This is what my code should look like
Enter two times in military format (e.g., 1730 1520): 1730 1520
[1520<1730]
Enter two times in military format (e.g., 1730 1520): 1520 1730
[1520<1730]
Enter two times in military format (e.g., 1730 1520): 1730 1730
[1730==1730]
Enter two times in military format (e.g., 1730 1520): 1760 1520
1760: [INVALID TIME 1]
Enter two times in military format (e.g., 1730 1520): twelve 2
[INVALID NUMERIC INPUT]
I'm trying to create a function where it allows the user to type in multiple amounts of integers, so if the user wanted to have 3 different storages that hold different integers, the input would look something like this:
5
97 12 31 2 1 //let's say this is held in variable "a"
1 3 284 3 8 // "b"
2 3 482 3 4 // "c"
2 3 4 2 3 // "d"
99 0 2 3 42 // "e"
Since we don't know what number the user will input every time, I'm not sure how to create a dynamically allocated array that will create an x amount of arrays every time.. I want to be able to access each index of a, b, c, d, e or however many arrays there are.
So far, this is what I have, but I'm having trouble creating the arrays since it's unpredictable. I'm purposely not using vectors because I don't really get how pointers work so I'm trying to play around with it.
int* x;
int length, numbers;
cin >> length;
x = new int[length]
for (int i=0;i<length;i++)
{
cin >> numbers; //this doesn't work because it only grabs the first line for some reason
x[i] = numbers
}
I need validation on what the user inputs. Input should not be an alphabet, empty, and not negative number. This program is for finding the GCD and LCM of multiple numbers.
#include <stdio.h>
void bubble_sort(int numbers[], int len) {
int i, j;
int swapped;
[Code] .....
I am trying to read from my input file Transactions.data which is set up as follows
V 250190
A 250190 2008 4 8788.00 0.00 000
and so on and so forth.
I am trying to read my V then go to switch (decision) to choose my case and preform further functions. My problem is that i cannot get past the first line so if it was
V 213400
V 123456
My code is supposed to check that the ID (213400) is valid then go on to the next line but it wont do that and prints out the first ID 6 times. My code is as follows:
char descision;
ifstream input;
input.open("Transaction.data");
if (input.fail()) {cout << "File could not be opened." << endl;}
input >> decision;
[Code] ....
I am having trouble with file I/O.
Let say I have an input file like this
x1 y2 b4
85 z4 x2
I'm trying to read the input without using arrays. I would use fscanf(*arguments*) to get the first char, which is x. Then I call it again to get the second one, which is 1. Now I would need to get the second input, y2. How do I skip the white space character to get to char y ? And is it an effective way to get all inputs though ? (each input, example x1, is read into a function).
I have an HTTP/1.0 webserver that I'm building in C that needs to exhibit CGI script functionality. Specifically, what I'm having trouble with is that I have two processes: process 1 is the webserver, process 2 is the CGI script. I fork in the webserver, and then call exec to run the CGI script (specifically, I used execv()). I've read from the CGI specifications in the RFC that in the case of a webserver receiving a POST request, the CGI script should read the arguments for the POST request from stdin. However, when I write to stdin, it simply echoes what was written to the terminal window and when the CGI script tries to read from stdin, it blocks.
So, with all that said, I'm pretty sure there is some simple conceptual explanation to my problem, but I can't figure it out. Do I need to use pipes or some form of interprocess communication to send the data from the webserver to the CGI script, or can it just be done with stdin (and possible stdout)?
Let's say I have a list of words that are followed by a number.
Word 1
Word 2
Word 3
Word 4
I need two arrays. One for the words and one for the numbers.
Code:
string STORE_ARRAY[100];// stores string (word)
string operation[STORE_ARRAY];
int PARA_ARRAY[50];//stores parameter (#)
int parameter[PARA_ARRRAY];
For the file input, I'm using this:
Code:
in.is_open()){
string line;
while(getstring filename;
cin>>filename;
vector<string> file_input;
[Code] ....
So first it gets saved in file_input, but then it needs to split it and move it into the appropriate array.
Using cin.sync() works great so far, but my program still breaks if you copy something with multiple lines into the console.
string test = "";
while(true) {
cin.sync();
getline(cin, test );
cout << endl << "test: " << test << endl;
}
However, if you were to copy this:
1
2
3
and paste it into the program, the output would be1
2
3
test: 1
test: 2
And if you press enter one more time:1
2
3
test: 1
test: 2
test: 3
The 3 finally pops out.
Okay so this is part of a small uni module around the arduino board. The task is to simulate traffic lights at a junction. At the moment my code below runs through the sequence with 2 seperate lights. When one set of lights turns RED , the other turns GREEN.In my main loop method I need to add a button for a crossing. I want to be able to check if the button is pressed at each of the delays but do not want to have to hold it down.I have thought about putting it at the top of the loop but then the program will only check if button is pressed in that point therefore the user will have to hold it down?
Code:
int green1 = 13 ;
int amber1 = 12 ;
int red1 = 11 ;
int green2 = 6 ;
int amber2 = 7 ;
int red2 = 8 ;
}
[code]....
I'm reading input from a file using an ifstream. The program doesn't seem to read any characters but continually returns eof no matter what file I use. Even when I do ifstream.open(filename) nothing changes. This program is intended to be the lexical analyzer of a compiler, so symbols are returned to indicate what kind of input is in the file.
Here's the code:
#include "lex.h"
#include <cstlib>
#include <iostream>
#include <fstream>
//other functions
char Lex::getChar(){
ifstream input;
[Code] ....
I'm sure I messed up the initialization of the ifstream somehow.
I'm in a CIS 143 class which is Introduction to Programming using C++. We've been assigned a lab with little to no detail on how to do the things listed.
The purpose of this lab is to practice the file input and output concepts. For this lab you may assume that the input files exist and contain appropriate data inside of them.
Four separate text files* which contain the following lines, different for each file.
(*: This isn't on the lab, but don't worry about what the name, age, id, and major are. those can be random and I can just change them what they need to be)
Name
Age
Student ID Number
Major
Your program should ask the user which of the four input files they would like to open, and then read the contents from the file. Once the contents have been read in, it should output to both the screen and a file named "output.txt" the four values were read in, arranged as follows:
"Hello <name>! You are a <age> years old <major> student, and your ID number is <ID number>"
Now I am by no means saying "Do it for me". I just need to know how to have a user type file1, file2, file3, or file4, and then have the program open that file, then have the output.txt file arrange the wording into the sentence above.
This is what I have so far and I don't think it is anywhere near correct:
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
ifstream inFile;
string file1;
string file2;
[code]....
I need to read input from a file , which contains multiple sentences of varying lengths. After each new line char, i need to store that sentence into an array.
#include <iostream>
#include <cstring>
#include <fstream>
#include <cstdlib>
[Code].....
I need reading a specific input syntax.
something like
<Input> :: R C <Content>
3
3
.3. .15 9.2
.1. ..6 ...
6.5 7.. ...
... .5. ..9
4.7 .8. 1.6
9.. .6. ...
... ..1 7.4
... 6.. .9.
5.1 49. .3.
The program will prompt the user to enter a every student's first and last name, major ( of 4 choices CMPS MATH PHYSICS or EECE ), and grade. it's agreed that the professor will enter the name NoMore to stop the entry.
the program willl then store the info in a txt file. after closing the input file, the program will open it again read the records one at a time until end of file, and do some statistics including: highest grade, average grade, and highest average by major.
Finally the program will print the results....
I want the numbers to be put into the array until it hits a new line. Maximum number of numbers is 1000. What can I replace that while loop with to stop it from reading further into the input file?
Code:
while (input != '
'){
for(i=0; i<1000; i++)
fscanf(ifp, "%lf", &auctions_prices[i]);
I have written a C++ program I have multiple of CSV file used as input, which I open one at a time and close it after extracting data to a output file which is the only file.
I run getline(inFile,line);
outFile << line << endl;
I run this code, and only part of it is goes to the output file I got, also have spacing randomly to specific file and inconsistent
But when I slower the code, like system("Pause") in the loop, I can get extract what I want perfectly....
Is my program running to fast, why getline would be skipping part of what things I want?
I want to develop an application which can host multiple views of explorer (window), where as each window is totally separate from others. So that I can have multiple desktop views through my single explorer. Any built in feature in .NET ?
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