C :: Reading A File In And Separating Line With Strtok Function
May 2, 2013
I'm trying to read a file from the 2nd argument, skipping the first line of the file since it's the name of the columns, and separate each line as a token, by date, subject, startTime, endTime, and location.Here's my code that I got so far:
In the assignment we are forbidden to use fscanf(). I have been trying to get this to work, but I've started to realize that I do not have a complete understanding of what strtok() actually does. I'm getting this warning when debugging: "assignment makes integer from pointer without cast."
This warning happens when assigning str to goal and assist, and I think it is because they are, when dereferenced, integers. The code below correctly assigns the name into the correct spot, but leaves nonsense data in the goal and assist arrays.
ex:-7880, -7888 file example: NAME GOALS ASSISTS JOHN 1 2
Code: void readLinesFromFile( FILE* Ptr, int* goal, int* assist, char** name, int lines ){/* * Reads lines from files and populates the arrays with the corresponding info. */ int index; char hold[ MAX_LINE ] = { 0 }; char* str = NULL;
[Code] .....
From what I understand about strtok(), it returns a string, and takes in a character array and a key value that tells it when to stop. In the online examples I've seen, they use NULL in the first field. I'm not sure why.
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??
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.
How to read a file line by line and then later access them by doing something like
Code: lines[0] //Line number one ... lines[100] //Line number one hundred and one lines[100][0] //L lines[100][1] //i lines[100][2] //n lines[100][3] //e lines[100][4] // lines[100][5] //n ...
I'm currently working on making a program that is run through a GUI run through the command line. The program basically takes an app file and a boot file and runs it through a bunch of functions and generates a new outfile. Anyway I'm new to C and can't figure out how to code it so I can type the two file paths into the command line and read them into the function. Is it possible to do this within the "if else" statement?
finding the last line of the code? I have a program with two functions that open and display a joke.txt and punchline.txt file. My joke function (which reads the entire file) works fine. The punchline function, however, does not.
i would like to read the content of a text file data.txt (line by line ) directly from the command line using this command: a.exe < data.txt.
What could be the c++ code to read/get the content of these lines (without using ifstream). The treatment of the lines is not a problem for me but i really don't know how to access the content of the file from the c++ code
My question is how can i read one line from a ".txt" file? To be more clear, i'm trying to write a hangman game. Therefore I'm trying to get words from a "wordlist.txt" file i created. I know a little bit about ifstream, ofstream and fstream. So my function i created to get a random line from this txt (not-completed yet since i don't know how to get that randomized line);
void grw() { int line; srand (time(NULL)); line = (rand() % 7972) + 1; ifstream wordlist; wordlist.open("wordlist.txt"); }
I created a variable called 'line' for the line number and randomized it (there are 7972 words in ".txt" file). So what i want to do now is to get the word on that line.
I have attached the file that I need to read into a data structure. In the example I am just printing it to the screen. This following code has worked for me before, but now isn't. I have tried in visual studios, and on unix, and neither are running it. I ultimately need it to run on unix.
I am trying to separate out particular sets of routines into a separate implentation and header file which can be compiled independently to the main program such that the program source consists of a file called customers.h, customers.cpp, and exercise_1_5.cpp
Each of the files should contain the following:
customers.h should contain the definition of the customer structure and the declaration of print_customers.
customers.cpp should contain the implementation (or definition) for print_customers.
exercise_1_5.cpp should contain an include of customers.h and the main program.
This is my original code from a single .cpp file
#include<iostream> #include<string> using namespace std;
[Code].....
The error messages I am getting from the compiler on the customers.cpp file:
C:UsersBenDocumentsCS264lab3customers.cpp:5:22: error: variable or field 'print_customers' declared void C:UsersBenDocumentsCS264lab3customers.cpp:5:22: error: 'customer' was not declared in this scope C:UsersBenDocumentsCS264lab3customers.cpp:5:32: error: 'head' was not declared in this scope
I am working on a project for school that has us read in a text file that contains 8 lines of SSN and grades. I am not sure how to go about reading in the lines and differentiate between the SSN and grades in the calculations.
im trying to read employee information from a file using structures but im having problems with getting the file to open and read in the information
Code:
Write a programt that inputs (at most 50) records from a sequential file #include <stdio.h> #include <stdlib.h> struct employee // employee structure definition }
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 had an assignment to do a palindrome program but im stuck in this part.
"This c-string will be sent to a function that will remove all spaces and punctuation marks from its c-string as well as change any uppercase letters to lowercase. Use string tokens to eliminate the spaces & punctuation marks. Make sure you include the NULL as you concatenate the tokens into a c-string. Then copy back into the original c-string for the pass by reference."
I'm pretty sure I did that part except how can i pass this cstring back to main? We really haven't even touched much of pointers except to use strtok().
I wrote this program, it's supposed to take a user-specified file, which has a bunch of numbers, and add all the numbers in a line and give me a sum and average.
This would output: ------------------------------------ Group Size = 2 i = 1 number = 1 Sum = 1 i = 2 number = 2 Sum = 3 Average = 1.50
Group Size = 3 i = 1 number = 1 Sum = 1 i = 2 number = 2 Sum = 3 i = 3 number = 3 Sum = 6 Average = 2.00
Group Size = 4 i = 1 number = 1 Sum = 1 i = 2 number = 2 Sum = 3 i = 3 number = 3 Sum = 6 i = 4 number = 4 Sum = 10 Average = 2.50------------------------------------ // END CONTEXT
Anyway, I wrote this program. Here it is. But strtok doesn't want to advance to teh next token?
Code:
#include<stdio.h> #include<stdlib.h> #include<string.h> int main(void){ int a, sum, number, groupsize; }
I'm trying to make a program that will search for a line in a text file using a non default delimitor at the start of the line. An example line in the text file would be as follows:
F Mary Smyth, 19, United Kingdom
I have been able to use the find function to search for and return the 'F' character but would like it to then display the whole corresponding line. Is this possible with the find function?
