C++ :: How To Display A String Per Line On TXT File

Mar 6, 2015

How can i display a string per line on the .txt i made? There are 2 .txt files, the one has: John Finn Xach The other is: password1 password2 password3 Question is: How can i display, let's say, i input "John" so it will display something like this "John's password is password1" or if i input Xach, "Xach's password is password3" When i use something like :

Code:

while(getline(passwordFile, str))
{cout<< username <<" password is " << str;
break;
}

It will work for when i input "John", but it doesn't work if I input "Finn" or "Xach"

EDIT: I tried this one:

Code:

while(getline(userFile, str1) && (passwordFile, str2))
{
cout<< str1 <<" password is " << str2;
break;

The output would be: Finn password is password1

It iterates the username but not the password.

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C++ :: Read Line By Line From Text File To String

Jul 5, 2013

I have a text file (test.txt) with the following data:

01,05,25,20130728
01,06,25,20130728
01,07,25,20130728
01,08,25,20130728
01,05,25,20130728
01,05,25,20130728
01,05,45,20130728
01,05,65,20130728
01,05,85,20130728
01,05,35,20130728
01,05,25,20130728
01,05,35,20130728

I want to read this to one string called line. So far I have this code:

string line;
ifstream myfile ("/home/Test.txt");
if (myfile.is_open()) {
while (myfile.good()) {
getline (myfile, line);
for (int a = 0; a <= 335; a++) {
cout <<line.at(a);
} }
myfile.close();
}

so far its only printing the first line and then throwing an instance of 'std::out_of_range'

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May 12, 2014

I have to read the information about logic gates from a file. The file format is shown below:

Code:
gateOne = NAND(inpA, inpB)
gate2=NAND(1,2)
3 = NAND(23,25,26)

As, it can be seen from the above structure that whitespaces are not same everytime. So, to deal with this situation, i am using boost library to remove all whitespaces from the line which is being read and then try to find the name of gate and its input. My code is given below which is able to correctly find the gate names and its first input...but my code is not able to find the second, third and so on input names.

Code:
//C
#include <stdio.h>
//C++
#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <cstring>
#include <boost/algorithm/string/erase.hpp>

[Code] ....

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Jan 6, 2015

I am new in c programming. I want to write a function that will count the empty line of the file and display the content.

/* ***************************
** creator: firstprint *
******************************/

#include <stdio.h>
/* function that will identify if line is empty or not */
is_empty(char *buffer) {
while(isspace(*buffer)) buffer++;
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[Code] ....

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Mar 28, 2014

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Code:
id = fopen("F://CS223/namepass.txt", "r");
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srand(time(NULL));
if(id == NULL)
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[Code] .....

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Mar 7, 2014

How can a mulitline string be read line by line

ex: str = "PERIOD="week"
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Jul 10, 2013

My program takes in an input file from the command line and converts the string from the file into a linked list and then depending on the command it will manipulate the string to either reverse the list, print the list, or take a character out...I'm having trouble taking a character out, my code compiles fine but doesn't change the string at all

Code:

#include <stdio.h>
#include <stdlib.h>
#define SIZE 1024

[Code]....

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Apr 19, 2014

I created class called students which suppose to store students names of in array but when I call the display function it display only the first name. but I want it to display names depending on the array size.

#include <iostream>
#include <sstream>
using namespace std;
const int SIZE=5;

[Code]....

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Mar 17, 2013

I am having problems printing "->" on the beginning of each line, im trying to do it as a loop and ending it when the user types "q". also i would like to know how to ignore text from the user when the input begings with a specific character. heres what ive done so far, and not currrently working as expected.

Code:
#include <stdio.h>
int main (void) {
char prompt;
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[Code] ....

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Oct 21, 2014

Program to read in 15 numbers and display them as follows //each number on a separate line

Code:

# include <stdio.h>
# define MY_ARRAY 15
int main(){
int i ;
printf("please enter 15 numbers

[Code] ....

Error that i get from compiler:
Error E2062 array1.c 14: Invalid indirection in function main()
Error E2062 array1.c 19: Invalid indirection in function main()
both pointing to the separate "scanf"

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Aug 17, 2014

I am trying to read a file line by line and then do something with the informations, so my method looks like this:

Code:
void open_file(char *link) {
FILE *file = fopen(link, "r");
if (file == NULL) {
fprintf(stderr, "Could not open file.
");
exit(EXIT_FAILURE);

[Code] ....

1) The first complain of valgrind is at the line where I use fgets and its telling me (invalid write of size x), but I have allocated my line to 56000 and the read line is shorter, why is there a write size error then :S?

2) at the line where I realloc where I try to shrink the space he's telling me: Address .... is 0 bytes inside a block of size 56000, But I know i need only this space so why is there a write over space error :S??

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So I'm reading a file line by line and storing it backwards into a list. So if the file has has this format...
1
2
3
4

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Instead the code will store the last variable in all nodes. So the final list will look like this...
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Here is my code...

struct node *head = NULL;
int i;
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struct node *temp = malloc(sizeof(*temp));
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temp->next = head;
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Jul 15, 2013

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Code:
int main(){
FILE *fp1;
FILE *fp2;
FILE *i;
fp1=fopen("file1","r");
fp2=fopen("file3","w+");

[Code] ....

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Oct 5, 2013

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I tried the code below but it will write from the second line, the whole line in one vector index.

int str; // Temp string to
cout << "Read from a file!" << endl;
ifstream fin("functions.txt"); // Open it up!
string line;
// read line count from file; assuming it's the first line
getline( fin, line );

[Code]...

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Im trying to read from a file, line by line, with no specified number of values in the file. Check out my code:

int main() {
string x;
ifstream fin;
int count = 0;
char ch;
fin.open("CWC_Master.txt");
if(!fin)

[Code] .....

Now, this works great! However, its skipping some lines. And I dont know why. For example: Lets say that the input file is:

superman toy
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batman toy
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How can I fix my code so that it SIMPLY(i say simply because I am still a beginner coder) can read line by line?

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Aug 24, 2013

I can able to get the last line ten chars but i cant get if the last line is null.

here is my code

#include <cstdlib>
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
using namespace std;
int main(int argc, char *argv[]) {

[Code] ....

here with i have enclosed my file where i am pick my last ten chars ...

Attached Files : log.txt (4.8 KB)

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Code:
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...
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lines[100][0] //L
lines[100][1] //i
lines[100][2] //n
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Jul 2, 2013

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for more information, here is an example:

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Here is my code so far, but it does not seem to work;

#include<iostream>
#include<fstream>
using namespace std;
int main() {
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int hours[SIZE]; //Array declaration

[Code]...

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Jan 23, 2015

I am reading my file (20GB) line by line using boost like this

PHP Code:

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 char* bytes = static_cast<char*>(mr->get_address()); 

An exception is thrown in the second line while allocating memory for mr.

I use boost because it can also work in Mac which my code will be ported to.

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Jul 27, 2013

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Sep 11, 2014

void login() {
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cin >> loginYorN;
if (loginYorN == 1) {
cout << "Please enter your username: ";
cin >> accountInfo[1];

[code]...

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Now here is where I need to input line 1(username) from login.csv or login.txt and line2(password) and storage these into accountID and accountPW.

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Code:

#include<stdio.h>
int main() {
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void main() {
constintMaxNames(20);
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charNames[MaxNames + 1] [MaxLetters + 1];
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[Code] .....

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For i = 3;

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It print me like that : Text[1] :

I dont learn class String More than that look at the next example :

For i = 3;

Text[0] : I learn class String#abcdef
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You see that in the first sentence i have continue to introduce some characters after # character and look what is happened :

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#include<iostream>
#include<string>
using namespace std;
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string text[100], cuvant;
int i, j, m, lung = 0;
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