C++ :: Parallel Scan Of Sorted Sequences?
Feb 4, 2015
I need to take an unknown amount of sorted files and then output any number that is in at least half of them... I know I need to read in the files to a vector and then iterate through them all at the same time looking at the lowest number first and so on. But I am stuck at the point of taking an unknown amount of files and putting them in a container.
This is what I have so far but the vector isn't working and I think I should be putting each file into its own vector.
string get_file(string filename)
{
ifstream in(filename);
if (in)
[Code]....
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Oct 25, 2013
I'm trying to understand winsock with c++. Let's assume I have a 2 working applications, one is the client and one the server:
Client: I can enter a command, for example chat or filetransfer, it will then switch into this specific mode where I can enter commands like uploading a file, send a message etc.
Client
Code: ....
while (rc != SOCKET_ERROR) {
printf("
#");
gets(buf);
if (strcmp(buf, "CHAT") == 0){
// start chat mode
[Code] .....
I'm in a recv/send loop and I'm using streams...so basically all the data is being sent/received there. Now, if I want to upload a file, I send a FILETRANSFER String to the server. Then I will probably need another loop that receives file requests from the client. The server will need more details about the file, like the path, name, size...
Now, my question is, what's the best practise for something like that? I'm having problems understand how I can send 3 different values from the server to the client and how he will receive them in the right order store them in variables. And also, after sending something to the server, in some cases, the client will have to wait for the server to answer.
Is there a good example of a similar application?
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Apr 1, 2014
According to [URL] ....
" char myword[] = { 'H', 'e', 'l', 'l', 'o', ' ' };
char myword[] = "Hello";
In both cases, the array of characters myword is declared with a size of 6 elements of type char: the 5 characters that compose the word "Hello", plus a final null character (' '), which specifies the end of the sequence and that, in the second case, when using double quotes (") it is appended automatically."
However there are examples where word array is declared as :
char myword[] = { 'H', 'e', 'l', 'l', 'o' };
Is syntactically correct?? If yes, what is the size of myword? and does ' ' append by compiler automatically?
And is char myword[] = "abc" same as char myword[] = {'a','b','c',' '} or is it same as char myword[] = {'a','b','c'} ??
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Jul 15, 2013
I've been studying the heck out of the boost metafunction libraries. I understand a good deal of what things like varadic functions and integral sequence wrappers are, but I am having a hard time putting everything together to get working functions, such as performing arithmetic operations or functions like that of std::vector.
Here is an example of what I'm talking about:
// Sequences
template<typename T... N> struct seq;
template<typename T, T... N> struct seq_c;
// Integral constant wrapper
template<int T> struct int_
[Code] .....
My knowledge of all of this is pretty scattered and I've really been trying hard to put it all together. Is this correct? How can I apply this and use it to do more?
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Jun 25, 2014
Basically, I am inserting data from an ODBC connection into a PostgreSql database using the COPY query, but the COPY query stops and returns this error...
Quote
ERROR: invalid byte sequence for encoding "UTF8": 0x92
CONTEXT: COPY [TableName], line 1: "189572|1-00-1202|1-|00-|1202||AP||1...
STATEMENT: COPY [TableName] FROM STDIN (DELIMITER '|', NULL '')
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Sep 17, 2014
i wrote the following code :
Code:
#include<stdio.h>#include<conio.h>
#include<stdlib.h>
int a[][4] = {15,9,10,25,6,2,4,7,32,19,42,8,21,17,18,0};
void boxes();
void display();
void main()
{int ch,r=3,c=3,t;
[Code]...
not able to esc when i press esc key.how to get rid of this.
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Dec 13, 2014
I created a program that will create a file and print a list on it. Here is the code for my program:
Code:
int controlvalue(void) {FILE *controlvalue;
controlvalue = fopen("something.txt", "a+");
/* Series of fprintfs */
fclose (controlvalue);
return 1;}
Here is an example list created by my program:
Code:
[Gifts]Candy=45
Chocolate=32
Toy=128
Robot=754
Doll=1492
Star=21
Phone=72
Skateboard=87
Frame=314
Days=365
Perfume=421
I want to get the value of "Skateboard" on file. So I need to read 9 lines. On the 9th line, the gets() loop will stop. But, what if I only want to get the value of "Skateboard" as integer (87) and not a string? Also, is it possible to scan the value of Skateboard if it's located on a different (or unknown) line?
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Jan 28, 2013
This is my code:
int main() {
int num;
printf("Please enter a number: ");
scanf("%d", num);
printf("%d", num);
return 0;
}
when i compile and run it, it stops working and doesn't printf the integer.
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Sep 19, 2014
How would I be able to let the user enter multiple heart rates which would all be separate.
Code:
printf("Enter your recorded Heart Rates ");
scanf("%d", &in_rate);
//formulas
if (gender == 'm'){
target = 226 - age;
} else if (gender == 'f'){
[Code]...
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Dec 19, 2014
I'm writing a C++ module that is meant to recursively scan a directory and I'm curious what yall think of my strategy.
The program is a music player and so I'm trying to make the directory scanner as lightweight and efficient as I can. I've decided I want to scan the files in two passes- first I just want to get a list of all music files that are found in a directory/subdirectories and then I want to process the list and search for id3s/other tags.
As I'm a scanning the directory, I've decided to store the temporary list in a linked list where each node is containing an array of 100 strings. I did this because I obviously don't know how long the list will be and I from my understanding of the C++ vector class it basically just makes over sized arrays and moves them when it runs out of space. That sounded rather clunky to me, as did a traditional linked list.. I didn't see the point of allocating memory that many times in a row.
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Mar 4, 2013
This is my text file.
bak kut teh[tab]888.0[tab]989.0
spicy chicken nugget[tab]999.0[tab]978.0
I'm experiencing some problem in trying to scan and put it into an array for the food names (e.g an array for food which consist of bak kut teh and spicy chicken nugget) and another 2 array for the other individual integer into C. However there seem to be some problem with my code.
Is there a difference if I use both tab and space instead of space for all?
Code:
#include<stdio.h>
int main() {
FILE *fp;
char food[100];
char buff[BUFSIZ];
float num;
[Code] ....
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Dec 21, 2014
Is it possible to fgets() the string (or word) only after a delimiter? I yes then how?
Example: Code: printer, scanner, machine
Also, how can I sscanf() a string with an indefinite number of sizes and assign it to only one variable?
Example:
Code:
str = "I Love C programming 9000";
sscanf(str, "%s %d", strvar, intvar);
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Oct 4, 2013
I'm working on a silent auction program that will scan a file and find the highest from each group of bids, then have a running total of money made throughout the auction. I'm pretty sure the rest of my code works, i'm just getting stuck on finding the largest number from the line in the file, saving it, then moving to the next auction.
input file text (first number is num of auctions, after that it's num of bids, then the bids):
5 4 100 500 250 300 1 700 3 300 150 175 2 920 680 8 20 10 15 25 50 30 19 23
Sample Output
Auction 1 sold for $500.00!
Auction 2 sold for $700.00!
Auction 3 sold for $300.00!
Auction 4 sold for $920.00!
Auction 5 sold for $50.00!
The silent auction raised $2470.00 for charity!
Code:
# include <stdio.h>
# include <stdlib.h>
# include <time.h>
[Code].....
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May 17, 2013
i need to prompt the user of my program to input numbers into an array so that later on these numbers can be added or subtracted with other numbers to form a new array. My problem is I don't know how to make the user input numbers which will then be saved into the array for later use. Here is the parts of my code that relate to the problem:
Code:
float Xv, Yv, Zv, Xu, Yu, Zu ;
float vector1[VECTOR_LENGTH] = {Xv, Yv, Zv} ;
scanf("%1f %1f %1f", &Xv, &Yv, &Zv);
printf("The first element in the array vector1 is: %3f
", vector1[0]);
The point of that printf function is to see if what they have entered is actually registering as what i want it to. This does not work however and the value for this always comes up as 0.
how to scan numbers into an array so that they can be used for later use?
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Feb 3, 2015
I need a code that will search through string 1 and find the first place with a letter that also appears in string 2 and return the pointer of that place. This is what I wrote:
char strPbrk(const char *s1, const char *s2) {
char p = *s1;
for (int i = 0; i < strlen(s1); i++)
for (int j = 0; j < strlen(s2); j++)
if ((p+i) == *(s2+j))
return p;
return NULL;
}
but it continues to return wrong values idk what I'm doing wrong.
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Nov 6, 2013
we conform to the ISO C standard and this snippet of code : Code: vector<tree*> *leaves = new vector<tree*>[num_threads]; where num_threads is specified from command line arguments so not dynamically allocating it violates the standard.
Let's also assume num_threads is greater than one.
What I want to do is scan each vector in leaves for duplicates. If any two vectors in the set have matching addresses, they both immediately go onto the "unsafe" pile and will no longer be subject for testing.
If a vector clears one vector, we test it against the others in the set.
So if we have 3 vectors, A, B and C we test A against B then A against C. For efficiency, we then then just test B against C.
Like I said, I want a "safe" and "unsafe" pile. Every vector in "safe" is fully unique while every vector in "unsafe" is not unique.
I thought about just using a for-loop to loop through leaves and then iterate through each element but I'm not sure if that'll work just right out of the box.
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May 11, 2014
In our Qt application, we have to load several files on application start-up starting from a root directory.
We are recursively scanning the directories and loading the files.
The total time it takes is about 12 seconds. Can we reduce this time if we use multi-threading?
I have heard that multi-threading does not work everywhere and it increases code complexity and debugging issues.
Would multi-threading solve the above problem? We want it to be platform independent (Mac, Linux, Windows).
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Mar 19, 2015
I wrote this program to scan a number and a string until EOF then print them to a file named "data.list". the problem is that the program duplicates last line of input in the output file. so for example if the input is :
1 test
2 dream
3 code
then output (in data.list file) would be:
1 test
2 dream
3 code
3 code
I also changed the program code so that it reads from data.list file. even here it duplicates last line!
so when program reads the info above saved in data.list it would be:
1 test
2 dream
3 code
3 code
3 code
here's the code for writing:
#include <stdio.h>
int main( void )
{
int num;
char str[80];
FILE *fPTR;
fPTR = fopen( "data.list", "w" ); // opens a file named "data.list", create if doesn't exist
while(!feof(stdin)) // loop until End-Of-File is pressed. Ctrl-Z in Windows, Ctrl-D in Unix, Linux, Mac OS X
[Code]...
and the one for reading from file:
#include <stdio.h>
#include <conio.h>
int main( void )
{
int num;
char str[80];
FILE *fPTR;
[Code]...
How do I fix this behavior??
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Jan 20, 2015
I am doing "Virus Tracking System" Project. I have to scan the directory selected from treeview ....
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Mar 6, 2015
suppose you we given a file containing sorted numbers
ie
1
2
4
6
7
9
10
12
14
and you needed to inset the number 11 into the file and keep it sorted.
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Apr 2, 2013
I been ask to create a sorted linked list module, and to test each function with 1 unit, 2 +.so i wrote my addtofront function( we have to use the same as the teacher)
Code:
struct MyList{
char * name;
Sorted * AddmyChar;
struct MyList * next;
}
[code]....
but i cant seem to test it because it always display a seg fault.... i dont know what i did wrong....how do i call this function in main to display a string i want?
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Sep 14, 2014
I've been working to make program to find the mode of sorted array. But the program didn't return the results correctly. Here is the code:
#include <iostream>
using namespace std;
int main () {
cout<<"Enter the size"<<endl;
int size;
cin>>size;
int data [size];
[code]....
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Jul 21, 2014
My code has no errors. I'm just having problems with getting the grades of the file sorted. grades is not a struct, but is a int inside struct School. Below is what I;m having problems with(this is just the code I started working with,I made a few changes but it didn't work,I have no clue)
void selectionSortG() {
Students min;
int key;
for (int i = 0; i < size; i++){
min = student[i];
key = i;
for (int k = i; k < size; k++)
[Code] ....
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Oct 7, 2013
I have to merge two sorted files. Algotrithm that i'm using is below, but it reads not all the numbers in the files, and stops, even the files contain the same number of elements. What is wrong, I can't understand.
ifstream f1("E:desc1.txt");
ifstream f2("E:desc2.txt");
ofstream f("E:desc.txt");
cout <<endl<< "Nuerele sortate: " <<endl;
int n1, n2;
f1 >> n1;
f2 >> n2;
[code]...
desc1.txt is:
99 97 95 93 91 89
and desc2.txt is:
100 98 96 94 92 90
and I'm getting this:
100 99 98 97 96 95 94 93 92
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Sep 14, 2014
I've been working on my program to find mode of sorted array. But the program didn't return the res
#include <iostream>
using namespace std;
int main () {
cout<<"Enter the size"<<endl;
int size;
cin>>size;
int data [size];
[Code] ....
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Dec 1, 2014
I have vector pair like below, it is sorted but I want to remove duplicate values: The vector is like below:
std::vector<std:air<std::string,double>> fileWeight;
Here is what in vector:
scene1.jpg 0.4
scene2.png 0.4
scene3.jpg 2.3
scene4.jpg 4.1
The highlighted top 2 are duplciated. How can I remove duplciated like this where I have to check whole pair?
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