C :: Reading From A File And Skipping Lines To Find String In File

Nov 26, 2013

Program background: Ticket Sales Details You will sell tickets in advance and at the door. Prices for buying in advance and at the door will be given. Also, the total number of tickets sold in advance will be given. Each guest will have a unique number. If there are n tickets sold in advance, then these guests will be numbered 0 through n-1. As the event starts, requests to buy tickets at the door may be made and these guests will be numbered sequentially, starting at the lowest unassigned number. The maximum number of guests will be 1000. The first line of the file contains the following three values, separated by spaces: Cost of the presales tickets (in dollars), Cost of the tickets at the door (in dollars), and the number of presale tickets. The first two values will be positive real numbers to two decimal places and the last will be a positive integer.

The second line of the file will contain one positive integer representing the number of auction items followed by a positive real value to two decimal places (at most) representing the minimum bid increment, in dollars. The first value is guaranteed to be 1000 or less and the second will be in between 1 and 50, inclusive.

The third line of the file will contain all the prices of the auction items, in dollars, separated by spaces, in order. Thus, the first price is the price of item 0, the next price is the price of item 1, and so on. These values will be real numbers represented to up to 2 decimal places.

The fourth line of the file will contain the three following positive integers pertaining to the raffle: the number of raffle tickets available, the cost of a raffle ticket in dollars, and the number of raffle prizes. (It's strange to have raffle tickets that don't cost a whole number of dollars.)

The fifth line of the file will contain each of the values of the raffle items, in dollars, separated by spaces, in order. Thus, the first price is the price if item 0, the next price is the price of item 1, and so on. These values will be real numbers with upto 2 decimal places.

The sixth line of the file will contain ten positive integers representing the number of each of the drinks 0 through 9, in order, that are in stock.

The seventh line of the file will contain ten positive real numbers with upto 2 decimal places representing the price of each of the drinks 0 through 9, in order.

The eighth line of the file will contain a single positive integer, numEvents, representing the number of events that occur at the charity ball. These events are split into two groups: actions by guests at the ball and awards given (raffle, auction, person, totalrevenue). All of the actions precede all of the awards. You will produce exactly one line of output for each event described. Here are the formats of each event that could occur:

If a patron buys a ticket at the door, a command will be on a line by itself:

BUY TICKET k

where k is a positive integer indicating the number of tickets bought at the door. These guests will be numbered as previously mentioned. You are guaranteed that the total number of tickets bought, including presales, will not exceed 1000. This is what I have so far and I cannot figure out why it wont calculate the total revenue. I am not completely sure if it is even accessing the if statement in main.

Code:

#include <stdio.h> #include <stdlib.h>
#include <string.h>
#define N 1000

[Code].....

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C++ :: File Management - Skipping Certain Lines From Files

Mar 11, 2013

I am supposed to write a program that reads lines from files and see if the first character is an odd number, if so it will out put the remaining characters to output file, else itll seek to the beginning of the next line, this is what i came up with but its not working as it should, im not sure if its the version im using or the program I wrote, the commented part below was another algorithm I was trying to use.

#include<fstream>
#include<iostream>
using namespace std;
int main() {
char c;
int i =0;

[Code] ....

My text file was as follows:
input.txt
3Ali
4Sami
6Rashid
3Aya

output was unexpected , although some was relatively write but not as I wanted...

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Oct 15, 2013

I am trying to print a specific line from a textfile

e.g
I have a text file called info.txt and inside it contains the id,item name, price, quantity

Code:
1,shirt,100,10
2,pants,50,9
3,pen,20,8

I know how to find a specific word at the line in the file but how do I find and print out the specific line e.g(print out just the entire contents of line 2)?

Code:
string temDescription;
ofstream fout;
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[Code].....

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Jul 13, 2013

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1:
..
..
2:
..
..
3:
..
..
4:

in this text file i need to print only the lines between 2: and 3:. How could this be done?

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Jun 3, 2014

I am trying to read lines from a .txt file like this:

// "file.txt"
This is the first line.
This is the second line.

To do this, I tried using the following code:

int main() {
std::ifstream data;
data.open("file.txt");

[Code] ....

The output I want is:

This is the first line.
This is the second line.

However, all I am getting is:

This is the first line.

I can't quite see why this isn't working. I am decently familiar with file streams in C++, so I thought I would know what I was doing, but apparently not.

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Sep 1, 2014

The first part of the exercise is to read the lines from a file placing each line into an array. I thought my code looked correct however nothing but garbage prints out. Here's my code.

#include <iostream>
#include <fstream>
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[Code]...

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Feb 27, 2015

lets say this is our textfile

-----------------------------------
45(here is space)string and other shit is here
454(here is space)string and other shit is here
4121(here is space)string and other shit is here
77(here is space)string and other shit is here
45545(here is space)string and other shit is here
1122(here is space)string and other shit is here
-----------------------------------

how do i get exactly that number in every line start? and compare but i jus tneed to get them to variable so ?

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Apr 29, 2013

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I have a file that I need to read in blocks. I need to read in n lines at a time, do some processing, and then read in the next block of n lines until the file is done. I know the size of the block, but not the number of lines in the file unless I check that first. Normally I would read in like,

Code:
// declarations
string new_input_line, input_file;
// create an input stream and open the input_file
ifstream input_file_istream;
input_file_istream.open( input_file.c_str() );

[Code] .....

// process through data_block

With this approach, I'm not sure how I would keep looping to read the next block until I hit the end of the file without knowing how many lines are in the input file. I could process the file to find that out, or get that number from bash and pass it it as an argument, but it seems like that shouldn't be necessary.

I could also read in and store the entire file as a vector of string and then process through it afterwords, but that would not be a very efficient use of memory.

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Code:

typedef struct {
/* declartion of variables */
} App
typedef struct {

[Code].....

How do I access the array content? I'm suppose to strtok the contents from the lines stored in the array and use it again.

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Apr 18, 2014

I am trying to put pieces of a csv file into an array, but i only want to put certain pieces of it. This is the information that i have

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Code:

Write a programt that inputs (at most 50) records from a sequential file
#include <stdio.h>
#include <stdlib.h>
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[code]....

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and so on..

no i want to find the 44,495 in this textfile.. calculate a new value like 44,495 x 2 + 5

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Feb 7, 2013

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* * * * * * *
* * * * * * *
* * * * * * *
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So I am supposed to create a program that reads a file and replaces "<" with "<" , ">" with ">" , "&" with "&" , and " " " with """.........

The program takes a file "test.txt" and reads it, replaces the characters above with the corresponding strings, and then writes the output to "scrubbed.txt".

A sample input would be: <something>

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#include<stdio.h>
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[Code] ....

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Code:

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[Code]...

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Here's the code so far...

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#include <fstream>
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[Code] ....

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Code in main()
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[Code] ....

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(
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[Code]...

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Code:
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Code:
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Code:
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