C++ :: Library Program To Add Information About Books In Binary File
Jan 3, 2015
I am working on binary files in turbo c++ 3.5 and i want to create a library program. I want to add information about books in a binary file and do functions such as: Search and replace, delete a record, and etc.
I do this functions but i have 2 problems: 1. For example when i add 6 records about books to file, BooksReport function cant show all records and for example just show 4 or 5 records and when i search records, from 5 records, for example i just found 3 or 2 records. 2.When i search and replace a word on file, all records thats before this edited record, will be deleted.
I'm trying to change some information from binary file but I get segmentation fault. Suppose there are two teams which names are same. The names are wanted to change. But, I get segmentation fault.
team_name, city , stadium ,fdate, colors the team is in binary file manunited,manchester,old_trafford,1878,black-rd chelsea,london,stamford_bridge,1905,blue-whte manunited,manchester,old_trafford,1878,black-rd
So I was asked to create a C++ program that will ask the user to input 5 books with the ISBN, Title of the book and author/s. It will ask for 3 authors, if the book has only one author, you should leave "author 2 and author 3" blank and display only one author. Thing is... I'm having a problem with the if else condition at the last part of my program. I cant seem to make it work.
#include <iostream> #include <cstring> #define SIZE 5 using namespace std; int i;
I'm having a problem in my Library assignment, this section of my code is for reading in books saved in a 'book.dat' file on my desktop and inserting them into the linked list. It kind of works, but say if there is two books in the file, it only saves the second book twice.
I am writing a program that grabs information from a .dat file. I have the code all structured up, but I get these 2 errors that does not make any sense to me on how to fix the program.
errors (2):
Code: Error1error LNK2019: unresolved external symbol "void __cdecl swap(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>, class std::allocator<char> > *)"
Given a structure book defined as follows and an array lib of books
Code: struct Book{ char title[100]; char author[100]; int price; struct Book *nextedition; };
struct Book lib[1000]; I'm going to write a function to compute total price of books by a given author including all books which are future editions of his book, even if the author of that future edition is NOT the specified author. title author price nextedition Book1 Author1 25 &lib[2] Book2 Author2 20 NULL Book3 Author3 30 &lib[3] Book4 Author1 35 NULL For the example above, given the author "Author1", the function should return 90 (=25+30+35), and given the author "Author 3", the function should return 65 (=30+35).
So here's my attempt:
Code: int totalPrice(char author[100]){ int total=0; for (i=0; i<numbooks; i++) if(strcmp(author, lib[i].author==0))
[Code] ....
What I'm trying to do is finding the first book in the lib of the specified author using for loop and then let the while loop do the rest. However, it seems the price is over-counted after each iteration of the for loop but I don't know how to fix it.
Following is the program I wrote it basically takes 9 inputs and then save them into binary file. then print out the data stored in binary data and find inverse of it then print the inverse out. but its stuck in a loop somewhere.
Code: #include <stdio.h> int main() { int a[3][3],i,j; float determinant=0; int x; FILE *fp = fopen ("file.bin", "wb");
For class I need to write a program that inputs a file (the dividend), performs binary division on the file (using 0x12 as the divisor), and outputs the remainder(checksum).
I have researched binary division algorithms and I get the general gist, but I'm still unsure where to start. How would I store the dividend and divisor? As two arrays of bits?
Then, I need to figure out how to perform shifts and XORs on the the binary numbers. Maybe I should use bitwise operations?
I am making a multiple quiz program. So everything is working fine, except for the part where i'm trying to add a highscore for each user which is being stored in a binary file. I have added a sample of the program containing the error. This isn't the actual program, which is very long.
class user { //The collection of all info pertaining to the users char user_id[50]; public: int hscore1; user() { strcpy(user_id,"NULL"); hscore=0;
I am doing a program that saves information on the memory and then i need to put by ascending order the student number.. but i can't get it to work...i tried with strcmp but not worked...
Code: typedef struct { char name[100], email[100], adress[100], postal[100], number[20]; int phone }data; t
Then i have this to input data
Code: void add(data* contact) { if (i<total) { printf(" Name: ", i + 1); fflush(stdin);
I am creating a WinForm registration application and my program accepts user input information and stores it but I am struggling to use my login function. I believe there is an error in the area of cmd.Parameters.AddWithValue section, I dont think addwithvalue is correct ? I get a fatal crash has occurred when I click Login
string constring = "datasource=127.0.0.1;port=3306;username=root;password=welcome"; string Query = "SELECT * FROM 'userinfo'.'users' where 'username' = @userid and 'password' = @password)"; MySqlConnection conDatabase = new MySqlConnection(constring); MySqlCommand cmd = new MySqlCommand(Query, conDatabase); cmd.Parameters.AddWithValue("@userid", this.userid_txt.Text); cmd.Parameters.AddWithValue("@passone", this.passone_txt.Text);
[code]....
Fixed the crash error, simple typo but now I am getting SQL Syntax errors which I originally believed I fixed.
i want to display the grade report of two students in the table but this code will repeat the grade report of one student in the tables and what is wrong with this code below ?
#include<iostream> #include<string> #include<fstream> using namespace std;
How can I send information and receive from external command prompt from my program??. I want to run an external command prompt, a code that's is not mine, to send information to this command prompt, then make my program hit enter at the command prompt and then receive back information from the command prompt.
The problem is that ... Even though it is reading from a a file, it is not reading a one struct. In this piece of code I'm trying to read the last struct, which should be k... The struct itself is here
The problem is that i dont know how to do because 'getline' won't work i think.
the file looks like this:
******************* Inventory of MyInventory ******************* Some info More info ------------------- 000 Toys 6.25 a short description 126/44 Cards 2.25 some text ******************* Inventory of MyInventory2 ******************* Some info More info ------------------- 000 Toys 6.25 a short description 126/44 Cards 2.25 some text
So what I need to know:
- the name of the Inventory (MyInventory, MyInventory2...)
- the numbers in each row (000,126/44...)
- the name what it is (Toys,Cards...)
- the price (6.25,2.25...)
- and the description(problem here is, that there are not the same amount of words for each description)
I tried it with 'getline' but this is not working because the lines are so different each time.
I want to receive an information from a file. For instance, you created a file name "sample.txt" via fstream and stored a bunch of people's name, address, phone number in that "sample.txt".
Now, I want to see what's stored in this file. Suppose, I wanted some particular guys address, phone number by just typing is his/her name.
How to relate the name with address and phone number of particular people? I just started the file creating so I wanted to know about it.
#include<iostream> #include<conio.h> #include<fstream> #include<string> using namespace std; int main() { ofstream outputData;
I'm trying to add more student information to the specific txt file. I did struct my student information and separated it with an array with max size of 200.
The inside of my current file looks like
Toshi Aka Nonal Donald
The first one represent student[0] and next one is student[1] and so on till student[199]. Right now, only 4 space is occupied, which means the array has information till student[3] but not from student[4] (I guess it has null condition).
What I want to do is, I want to add a new student information to student[4] and till student[199] once at each time.
So, my prompt will look like Would like to add a new student? Y/N (if yes goes to below statement and exit if NO) Hi. Please enter the information of new student. ___________ Student added. Please press any key to continue.
If the key is pressed, it goes back to my initial prompt and continues till I press N.
I sure I'm not using for loop to do this thing, because I'm adding student name one by one.
However, the array is already occupied by other student name till student[3] so, I want to add a new student information to student[4] (I don't want to overwrite the current information). And if student[4] is occupied, then [5] and so on.
I want to take the informaition from this file and save it into a struct the file conteins name age year (in char) and a grade it is somthing like this
file Nikos Tolis 19 A 8 Iwanna Nikolaou 20 B 9 Kwstas Doukas 20 Β 6 Georgios Pappas 19 A 7 Iwannis Lekatis 20 Β 7 Nikos Ntoumas 19 A 5 Maria Oikonomou 20 B 6 Kwstas Argyrou 19 A 10 Irw Ntouma 20 B 8 Leuteris Doukas 19 A 6
I want to read till i found the '32' the space in ascii here is my code so far
Code: #include<stdio.h> #include<string.h> #include<stdlib.h> struct students { char *name; int age;
Create a simple data file like the example shown below containing the 4 dates below plus 10 or more additional dates. The file should include 1 date per line and each date should have the form MonthNumber-DayOfTheMonth-Last2DigitsOfTheYear with no extra spaces. All dates should be in this century. No error checking for invalid dates is necessary.
My Output displays like
February -19,1991
How do I get my program to ignore the dash between the dates?
#include <fstream> #include <iostream> #include <string> #include <cmath> using namespace std; int main(){ const int M = 13;
Here your supposed to create a program that takes in information and formats it into three columns.
I can't seem to use the float variable unitprice with decimal places here for, if I try to use %.1f and type in an input, the program seems to skip over the second scanf function, not allowing me to put input into the third scanf function as the program runs before I can.
I can use %f on its own and it works but this creates too many zeroes(and you're supposed to set the currency limit to $99999.99).
Code: #include <stdio.h> int main(void) { int itemno, month, year, day; float unitprice;
[Code]....
So the output should look like three columns. It's just the float that is the issue here....
