C++ :: Writing Float Value To File
Oct 11, 2014I'm trying to write the value of xcord to the file, but it's come out as jiberish like š™ for some reason.
#include <iostream>
#include <Windows.h>
using namespace std;
[code]....
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C++ :: Read Float Value From File?
Jan 12, 2014how to read float value from file like getw function used to read integer data.
View 2 Replies View RelatedC++ :: Turning A Limited Float Into Another Float?
Nov 20, 2013I can do the folowing:
float var1 ;
var1 = 9.12345 ;
printf("%.2f",var1) ;
the output will be 9.12. What if I wanted to save that as another separate float with displaying it on screen?
C/C++ :: Cannot Convert Float To Float Assignment
Jun 8, 2014#include <iostream>
#include <string.h>
#include <sstream>
[Code]....
C :: Scanning A File With Words And Int / Float Numbers
Dec 1, 2013scanning a file with both words and INT's/Float numbers. This is the file data here.
15 25 200
3 10
17.99 22.99 109.99
100 2 4
5.99 99.99 20.00 49.99
10 10 10 10 10 10 10 10 10 10
3.99 5.99 7.99 8.00 5.00 5.00 5.00 6.00 7.00 9.99
[Code]...
What I'm focused on is reading in the first three numbers which I already have with fscanf and then reading in BUY TICKET with the digit afterwards. My problem is that I don't know how to reach that part of the file without scanning in something I don't want to. Also, how would I scan the number after scanning BUY TICKET? Would it be something like using %s and %d right afterwards?
C/C++ :: Input Float And Integer And Save It To Txt File
Mar 20, 2014i am writing a program that requires me to write am input a float and an integer and save it to a txt file. When i try to compile my code i get an error "assignment from incompatible data type". ?
int *intconstant;
float *floatconstant;
int *value;
struct FILE *infileptr, *outfileptr;
infileptr = fopen("/home/brinkmann.brendon/assign14data.txt", "r");
outfileptr = fopen("/home/brinkmann.brendon/assign14report.txt", "w");
[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 :: Computing Grades From Input File And Writing To Output File
Aug 31, 2014 One 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 next (2) at 15% each and the final at 30%. 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:
//
// main.c
// Final Exam
//
[Code].....
The problem I'm having now is how to go about passing the grades to the function computeGrade and then compute the average and return that to the function.
C++ :: Can Edit Text File Without Writing Content Of Whole File Again
Mar 28, 2013Can i edit records stored in file without rewriting whole file again .?
View 1 Replies View RelatedC++ :: Debug Error When Taking A String And Casting It To Float With File Stream
May 9, 2014Debug Error
ProjectsFinal ProjectGrItemDebugGrItem.exe
R6010 - abort() has been called
I was going over this with a friend and it seems as though getline() is not reading anything in and thus throwing the abort error. I'm not sure why this is because I've included the textfile, with the correct name of course, in both the regular file location and the debug folder. I ask for user input and the user then inputs the name of the file they want, I do some required things behind the scenes and display the results for them in a cmd window. I've included pastebin files for both my header and cpp files because it is far to large for one post I shall, however, post the full code in the comments.
Quick Code
The problem occurs on line 159. I'm assuming once this line is fixed, line 163 will have the same problem.
// Read regular price
getline(nameFile, input, '$');
vectorList[count].regPrice = stof(input.c_str());// Casts string to a float
// Read sale price
getline(nameFile, input, '#');
vectorList[count].salePrice = stof(input.c_str());
Pastebin Links : [URL] ....
C/C++ :: Write A Program That Reads Four Float Numbers From The Input Text File
Apr 3, 2015I need to write a program that reads four float numbers from the input.txt file, then it prints out the greatest of the four numbers into the output.txt file. I did everything, but the numbers don't print out.
#include <iostream>
#include <fstream>
using namespace std;
int main() {
ifstream inFile;
ofstream outFile;
float number1, number2, number3, number4;
[Code]...
C++ :: Writing New Line To File
Sep 9, 2014I am executing below sample program
Code: #include<iostream.h>
#include <fstream.h>
using namespace std;
int main()
[Code]......
when i am counting the lines using wc command it is giving 1 instead of 2.
C++ :: Reading And Writing Bit To A File
Nov 3, 2014I'm writing a program using Huffman algorithm to compress text file. I have tested my program by just printing the printing ASCII character to file and it worked fine. However, now I have to implement using bits and my program doesn't work. It seems like I'm not reading or writing the right bits. Here is the result of my testing:In the input file I put abc the input file to compress it. Then I uncompress it the out out is aaa. Below is a snippet of how I read and write bits
Code:
class BitInput {
istream& in; // the istream to delegate to
char buf; // the buffer of bits
int nbits; public:
BitInputStream(istream& s) : in(s), buf(0), bufi(8) { }
[Code] ....
C# :: Writing To A File (Not Replacing)
Dec 11, 2011I have a question about an issue I am having on my final project. Within my ItemEntry.cs form, I am trying to get the application to append the already existing .txt file, rather than prompt the user to replace it. I can't seem to get the StreamWriter and FileStream to allow the user to write to the file.
Code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
[Code] .....
C :: Writing A Struct To A File
Sep 28, 2013I am trying to write a structure to a file. Example say the structure has two variables x and y . I want to write a function which modifies these variables and stores the modified version on a file. Such that next time I call the function . it has the values from the previous write. Here's an example of my code .
Code:
// initialize the structure struct->x = 0, struct->y = 0
File *fp = fopen("filename", "r+");
struct MYSTRUCT mystruct = (struct MYSTRUCT*)malloc(sizeof(MYSTRUCT))
//check
fread (mystruct, sizeof(MYSTRUCT), 1, fp);
// do some calculations.
fwrite(mystruct, sizeof(MYSTRUCT), 1, fp);
fclose(fp)
//return some value
}
The problem is that each time I run the program it shows the initialized value of the variables and not the value from last write. I guess the write isn't successful because when I open in w+ mode. i get the error file could not be opened and then i have to delete the file and re create it....
C :: File Reading And Writing
Sep 19, 2013I have a text file containing 500 signed decimal numbers. My task is to read each entry and convert into a 16-bit 2's complement representation (binary number) and write into the another text file.
View 2 Replies View RelatedC :: Writing New Line In A File?
Oct 4, 2014I have a problem writing new line in a file. So far, this is my code.
Code:
fprintf(f, (ctime(&mytime)));
fprintf(f, "%s %s %d %d", item, brand, price, amount);
fprintf(f, "
");
fclose(f);
C :: Reading And Writing To File
Mar 19, 2013Code:
#include <stdio.h>
struct hardware{
int recNum;
char toolName[30];
int quant;
double cost;
[Code] .....
I'm having issues with my functions working properly. I'm not sure where I'm going wrong with them and if i'm using the correct mode for the fopen.
C++ :: Reading And Writing To The Same File?
Apr 30, 2013Is there a way to read and write to the same file?
I'm writing a game program and I want to save the score at the end of the game to a txt file. The txt file already contains other game scores. How do I store the score without overwriting the previous scores.
I'm just using basic fstream.
C++ :: Writing Some Classes Into A File
May 28, 2013I want to write a program in cpp which will create a file and write some classes into it so that whenever i will execute that program i will have the auto generated file. How to do it....
View 1 Replies View RelatedC++ :: Buffer Not Writing To File?
Aug 22, 2014suddenly nothing is written to my file
void taglessLine(char line[],ofstream& buffer){
buffer.open("buffer.txt", ios::out);
int len=strlen(line);
[Code].....
C/C++ :: Reading And Writing Bit To A File
Nov 3, 2014I'm writing a program using Huffman algorithm to compress text file. I have tested my program by just printing the printing ASCII character to file and it worked fine. However, now I have to implement using bits and my program doesn't work. It seems like I'm not reading or writing the right bits. Here is the result of my testing:In the input file I put abc the input file to compress it. Then I uncompress it the out out is aaa. Below is a snippet of how I read and write bits
public:
BitInputStream(istream& s) : in(s), buf(0), bufi(8) { }
/** Read the next bit from the bit buffer.
* Return the bit read as the least significant bit of an int.
*/
int readBit(){
int i;
if(nbits == 8){
buf = in.get();
[Code] .....
C/C++ :: Newline When Writing To File
Sep 12, 2014I've got an issue with my code; whenever I add the " " for a newline, a newline is not actually printed onto the file.
Here's my code:
/*
Description: Lists all the files & other directories in the directory passed through argv.
*/
/*
Importing the required headers.
Dirent.h for the dirent struct.
Stdio.h for printf.
Conio.h for File input/output.
*/
#include <dirent.h>
#include <stdio.h>
#include <conio.h>
int main ( int argc, char *argv[] ) {
// Checking that the user has given the correct number of arguments.
[Code] .....
The solutions I've tried are:
Trying to add the ASCII character for a carriage return (13) and newline (10), but it didn't work.Using fputs() and fprintf() - both mentioned in the code.
C++ :: Writing To File In Callback Function
Mar 31, 2013I want to do a basic thing but for some strange reason there is something not working.
I need to write to a file but I'm handling all the code in a callback function, which in turn is declared in a class. Here is the architecture of my code:
Code:
int main (int argc, char **argv) {
ImageConverter Aclass;
while(1); //infinite loop
return 0;
[Code] ....
But this doesn't work, the file gets created but it allways overwrites itself which is not what I need to do.
What I am doing wrong? Is it because i am constantly declaring outfile?
C :: Writing Log File In Multithread Program
Oct 20, 2014I'm currently finishing writing some small application. I want to be able to log important information about the program execution to a logfile, and I have several questions.
First of all - I'd prefer to make the part that logs information to a file separate from the code I've already written. So, what interface should I expose to the rest of the program? Is one function void log(const char*); enough?
Another thing that came to my mind; my program runs two threads, and I want to be able to write to the log file from both threads, so the question is: Should I make sure that the writing to the file is mutually exclusive?
And if so, whose responsibility is it to make the logging to the file thread-safe? The actual part that does the logging (void log(const char*) for that matter), or the parts of the program that calls log(const char*) ?
And lastly, and probably less importantly, where is it customary to save the logfile? (the user's home folder maybe?)
C :: Writing Garbage Data To File
Mar 21, 2013Im programming client/server app that client provide the file name then the server send it to client then the client will save it ..this is part of code in client
Code:
char buffer[1024];
printf("FIle is being downloaded ...
");
printf("%s
",buffer);
}
[code],...
So i have 2 problems ::
1st one is when i write to file the file permission i cant define it with data type mode_t ,so the file does not open at all after creation...
2nd one is: the data in buffer is less than 1024 ,the data wrote to buffer but with garbage data . How to make the file read only the real data with garbage ??