C :: Using Strtok And Strcpy In File
Sep 27, 2014How to use strtok and strcpy in a file?
View 1 Replies
ADVERTISEMENT
C :: File I/O And Strtok Not Advancing
Nov 20, 2013I 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.
Sample file:
------------------------------------
2 1 2
3 1 2 3
4 1 2 3 4
------------------------------------
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;
}
[code].....
C :: Reading A File In And Separating Line With Strtok Function
May 2, 2013I'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:
Code:
void readAppointment(){
if (arg != 2)
exit;
else {
FILE *fp;
fp = fopen( argv[1], "r");
char line[999];
[code]....
C :: Using Strtok In Conjunction With Fgets Function To Parse File Data
Feb 17, 2013In 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.
C :: How To Use Strcpy On 2D Array
Sep 20, 2014how to use strcpy on a 2D array. The names of the students are suppose to go along with the correct score(descending order).
Student's name are:
Jack 83
Pete 100
Shawn 75
Tim 40
Turns out according to their score:
Pete 100
Jack 83
Shawn 75
Tim 40
Code:
char students[20][50];
char name[20];
temp = 0;
for(i = 0; i < count; i++){
for(j = i + 1; j < count; j++){
if(averageScore[j] > averageScore[i]){
temp = averageScore[i];
[Code]....
C :: Using Strcpy For Arrays
Feb 2, 2013I am attempting to assign "randomChoice" as the array index of the "listOfWords" array then copy "listOfWords[randomChoice] to "selectedWord". I am not sure if it is that I do not fully understand the use of strcopy() or something wrong with my arrays.
This is my error:
Code:
hangman.cc: In function ‘void SelectWord(char (*)[80], int, char*):
hangman.cc:84: error: invalid conversion from 'char' to 'const char*' And my code:
Code: #include <iostream>#include <fstream>
#include <cstdlib>
#include <cassert>
#include <cstring>
[code].....
C++ :: Strcpy Gives Seg Fault
Dec 28, 2014I am trying to practice different concepts in C++ programming. Following is the program which compile successfully but gives seg fault at runtime.
#include <iostream>
#include <string.h>
using namespace std;
class A {
char *name;
int i,j;
const double k;
static float l;
int &m;
[Code] ....
C/C++ :: No Output When Implement Own Strcpy Function
Aug 20, 2014I am trying to implement own strcpy function, but no output is being printed.
#include<stdio.h>
#include<string.h>
void strcpy_own(char dest[], char src[], int len);
int main() {
char src[15]="jeevan", dest[15];
[Code] ....
C :: Strcpy - How To Update Old String In Stars Array With New That Includes Correct Letters
Apr 25, 2013This for loop replaces the stars ******** in an array that contains a word to be guessed with the correct letter (c) that the user inputs if the word contains that letter.
Problem: After every guess the same hidden string of stars ******* is displayed instead of ex: ***W**** (assuming W was entered by the user)
How can I update the old ******** string in the Stars array with the new string that includes the correct letters chosen, so after every correct guess at a letter in the word a new string is displayed including the correct letters chosen?
I'm pretty sure I have to use strcpy but not sure how to implement it using a loop.
Code:
for(i = 0; i < strlen(unscrambledWord); i++) {
if(unscrambledWord [i] == c) {
Stars[i] = c;
} }
C :: How Strtok Will Work In Beginning
Nov 28, 2013Assuming that we have the string :
Code:
***HELLO&SIR. & and * is the delimiters.
My question is how strtok will work in the beginning?
According to this to determine the beginning and the end of a token, the function first scans from the starting location for the first character not contained in delimiters (which becomes the beginning of the token). And then scans starting from this beginning of the token for the first character contained in delimiters, which becomes the end of the token. The scan also stops if the terminating null character is found.
This end of the token is automatically replaced by a null-character, and the beginning of the token is returned by the function. strtok will replace the first * with '' and the next call will start from the second * puts '' there and again the same with the third * ?
C++ :: Using STRTOK With Null Fields?
Jul 23, 2013I am beginner in C++ programming. And i was try use STRTOK code with NULL fields, but in ARRAY fields NULL values is skiped. For example:
input text in Memo2:
AnsiString PAT02[100][20];
for (int IndexVRadku02 = 0; IndexVRadku02 < Memo2->Lines->Count ; IndexVRadku02++) {
AnsiString PNF02 = Memo2->Lines->Strings[IndexVRadku02];
char * PN02;
[Code] ....
Result:
Array 00 01 02 03 04 05
00 0000 TEXT1 TEXT2
01 0002 TEXT3 TEXT4 TEXT5
02 0003 TEXT6
But i need this result:
Array 00 01 02 03 04 05
00 0000 TEXT1 TEXT2
01 0002 TEXT3 TEXT4 TEXT5
02 0003 TEXT6
C/C++ :: Strtok And Null Checking?
Mar 1, 2015I'm playing around with parts of code and am coming across some errors. Most of my concern is related to strtok(). I've used it before but with a char* named token. I used a while loop to continuously check whether token was equal to NULL. In the following code, however, there aren't any checks. I was wondering if that is why this code prints (null) while running. Also, I would like to know if it is possible to read input like this code attempts to do - assigning tokens to each variable one after the other.
The format of the input:
Zucchini, Squash, pound
Yellow, Squash, pound
Tomatoes, Ugly Ripe, each
#include <stdio.h>
#include <stdlib.h>
[code]....
C :: Removing Trailing Character With Strtok
Sep 18, 2013I am having a problem with the output of a file. My function does everything it needs to do with the exception of one line. I have a .dat file with the following:
Code:
joe clint james brint howard
jimmy
alexander
*
me
When I run the function my output is as such:
Code:
file opened
word: joe
digit: 3
word: clint
digit: 5
word: james
[Code] .....
ERROR non alphanumeric digit on line 4!
File closed "Howard" is only six digits in length. Also it seems to skips a line in the output which could be the extra character but I am not sure. What I find very interesting is the other names, (jimmy & alexander) on separate lines do not have that problem.
Here is my function:
Code:
#include "main.h"
#include "fileCheck.h"
int fileCheck(FILE *fp){
int line_count = 0;
int ret_val = 0;
int digit_count = 0;
char file[BUFF];
[Code] .....
How I can correct this? I am aware of sscanf to parse the line but I do not know the format of the file. All I know is the file will be alphanumeric and if there is a non-alphanumeric, I must print out an error with the line it occurred on such as the above output.
C :: Tokenizing String Without Strtok / Other Functions
Jul 14, 2014I am trying to make simpler equivalent of strtok().i want to separate string for my command line program. here is what i came up with
Code:
PVOID CmdArgs(PWCHAR Arg){
PWCHAR Return[10];
int I=0,s=0;
}
[code]....
i can not use winapi or standard c library because project im doing is pure ntdll api program (subsystem native in other words)
C/C++ :: Can Use Strtok For Splitting A String With A Certain Pattern
Oct 31, 2012I have a string like "THIS::IS::THE:EXAMPLE::STRING"
I want to split the string to tokens based on "::".
The tokens should be:
THIS
IS
THE:EXAMPLE
EXAMPLE
STRING
C/C++ :: Palindrome Program - Cstrings Using Strtok Function
Feb 28, 2014I 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."
void tokenptr(char drome[]) {
char *token;
size_t i;
token = strtok(drome, " ,.!:;?");
while (token != ' ') {
[Code] .....
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().
Visual C++ :: CFileDialog Saves File In Project File - Not Specified File
Apr 12, 2013I'm very new to MFC & VisualC++. I'm using MSVS2010 Pro. I am trying to write/debug a simple form that saves and restores the content of some edit controls. It seems to work as expected, except the file saves only to the Project Folder, regardless of where I browse and select to save the file.
Code:
void CMFC_FileDialogDlg::OnBnClickedbtnsave() {
this->UpdateData();
CFile f;
//Kinda Correct, Works but still saves in Project Folder
BOOL b_OpenFileDialog = FALSE;//this doesn't act as bool in CFileDialog?
[Code] ....
My only experience is a little simple VB programming in Excel, so any specific examples??? Also, rules seem to change from version to version? I have to "update" a number of undocumented programs.
C++ :: Multiple Of CSV File Used As Input / Extracting Data To A Output File - Getline Function
Jun 4, 2013I have written a C++ program I have multiple of CSV file used as input, which I open one at a time and close it after extracting data to a output file which is the only file.
I run getline(inFile,line);
outFile << line << endl;
I run this code, and only part of it is goes to the output file I got, also have spacing randomly to specific file and inconsistent
But when I slower the code, like system("Pause") in the loop, I can get extract what I want perfectly....
Is my program running to fast, why getline would be skipping part of what things I want?
C :: Program To Calculate Students Grades From Input File And Write To Output File
Aug 29, 2014One of my class assignments is to create a program that receive a .txt file containing a students name and their grades as follows:
John K. 99, 87, 57, 89, 90, 95
Amanda B. Jones 100, 88, 76, 99, 86, 92
etc..
The number of students is unknown until run time. You have to take those grades and average them weighing the first (4) at 10% a piece and the last (2) at 30% each.
Then return an output file with the students name and their letter grade A,B,C,D,F based on their computed score. In addition, on screen it needs to display the average scores for each Q1, Q2, etc. as well as the minimum and maximum for each test on the screen. I am having a hard time in assigning the scores to a variable so that they can then be computed as an average and then used to determine a letter grade. I have begun to write the code and am a bit stuck..here's what I have so far:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
[Code]....
C++ :: Data File Handling Error - Character Strings Not Copied On Text File
Nov 24, 2013I have this code for a computer project... (store management) but the character strings are not copied on text file..
#include<iostream.h>
#include<conio.h>
#include<fstream.h>
class Store {
public:
char *item_name[5];
store()
[Code] .....
Now when i run the program, it gives a error :::
ERROR
address 0x0
How can i write these strings to the text file?
C :: Create File To Write Text And Read Back The File Content
Mar 15, 2013The Objective Of This Program Is To Create A File To Write Text And Read Back The File Content. To Do That I Have Made Two Function writeFile() To Write And readFile() To Read.The readFile() function works just fine but writeFile() doesn't.
How writeFile() function Works? when writeFile() function Execute It Takes Characters User Type And When Hit Enter(ASC|| 10) It Ask "More?(Y/N)" That Means What User Want? Want To Go Next Line Or End Input?
If "Y" Than Inputs Are Taken From Next Line Else Input Ends.
But The Problem Is When Program Encounters ch==10 It Shows "More?(Y/N)" And Takes Input In cmd variable.If cmd=='Y' I Mean More From Next Line Than It Should Execute Scanf Again To Take ch I Mean User Input.But Its Not!!! Its Always Showing "More?(Y/N)" Again And Again Like A Loop.
Code:
#include <stdio.h>
void writeFile(void);
void readFile(void);
int main(){
[Code].....
C :: Printing Contents Of A File - Prints One Extra Character Not Present In The File
Feb 12, 2013I'm writing a program that stores records into a file and then these records can be printed out. A last name, first name, and score is stored to be exactly 36 characters long (using leading spaces to pad) making it easier to retrieve specific records. For example, three records stored in the file would like like this: (the underscores are simply to illustrate the distance, they are not in the file itself)
_______lastname_______firstname__90__________lname __________fname_100___________last___________first __60
When printed out, the names are formatted as follows:
lastname, firstname: 90
lname, fname: 100
last, first: 60
However, when I print them out this is what I get:
lastname, firstname: 90
lname, fname: 100$
last, first: 60H
For some reason, for any record after the first, an extra character is added to the end. These characters are not in the file, so I was thinking that the array for some reason wasn't being filled completely, (the array is initialized to size 36 and 36 characters are read from the file using fread) so it was printing out a random character assigned to the 36th array position. Except the character never changes, (always a $ for record 2, H for record 3, l for record 4 if i remember) and I've tried reducing the array size or the number of character read and it's the string that gets altered, the random character always remains. I figure the problem must be in the print_records function (appending seems to work no problem). Anyway here is my print records and appending records code.
Code: /*
- Prints a single record stored in the file pointed to by ifp.
*/
void print_record(FILE *ifp, int record) {
[Code]......
C :: Convert List Of Names From One Text File To Email Format In New File
Jan 19, 2014I have almost a hundred names in a text file that I want to convert to email addresses and save to another file. I seem to have it working, but it doesn't print the full names in the email prefix. The output I'm looking for is Doe_John@livebrandm, but I'm only getting D_J@livebrandm. I'm not sure what I should specifically be reading up on that applies to this directly.
Code:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE *fpin=fopen("namesIN.txt", "r");
FILE *fpout=fopen("emailOUT.txt", "a");
char first[20],last[20],inbuff[1500];
[Code]...
C :: Writing A Simple File / Text Parser To Read A Config File
Feb 6, 2014I am writing a simple file/text parser to read a config file for some code I am working on. It's dead simple and not particularly smart but it should get the job done. The code reads a config file:
Code:
readlength=2500000
start=0
finish=25000000
cutoff=20000
samplingfreq=250000
poles=10
filterpadding=500
}
[code]....
Here is where it gets wierd. You'll notice that there is an unused variable (filepath) in the config struct. This variable is not referenced or used anywhere in the code, ever. Yet if I comment out the declaration of char filepath[1024], the code segfaults partway through the read_config() function.
My best guess is that there is a buffer overflow elsewhere and it just so happens that the memory allocated for filepath happened to be there to catch it up until now, but I can't work out where it might be happening. With the declaration commented out, the read_config() function gets as far as reading the "padding" variable before it crashes. Yet when the declaration is there, then all the variabled are read correctly and everything seems to work.
C++ :: Implementation File Versus Header File - Eclipse Giving Errors
Feb 10, 2013I have written my program and it works when I keep everything in the header files, and then have my main. I am now splitting them up into implementation files, but Eclipse keeps giving me errors. It gives me error at every opening brace of the constructor and functions. It says on all of them "Redefinition of (name of constructor or method), Previously declared here." What am I doing wrong, because it works in the header file?
#include "KeyValuePair.h"
template<typename Key,typename Value>
KeyValuePair<Key,Value>::KeyValuePair()
[Code] .....
C++ :: Overloaded Operator Defined In Header File - Gives Error In CPP File Of Class
Apr 12, 2014I am working on an assignment in which i have to perform th following task
myClass itsObject1,itsObject2;
itsObject2=5000+itsObject1;
I have defined overloaded operator as follows in the header file but in the cpp file of the class it gives error.
friend vli &vli::operator + (int &a,vli &obj);
How to define it in cpp file of my class?