C :: How To Test Program That Opens Files In Command Line

Mar 10, 2014

The below program is supposed to display the contents of all files listed in the command line. When I try to run the program I get the fatal error "Debug Assertion Failed" Expression: file != NULL. I've done some researching on the matter and I gather it might be because I don't have any files listed in the command line?

How to enter files in the command line! I opened the Command Window in Windows XP and tried typing in "C> argc" and "% argc" (argc being the name of the file containing the below program) without any luck.

Code:

#include <stdio.h>
#include <stdlib.h>
int main (int argc, char * argv[]) {
int ch; // int to hold EOF
int count;
FILE *fp;
for(count = 1; count <= argc; count++) // agrc loop

[Code]...

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C/C++ :: Program That Can Merge Files From Command Line In Li

Sep 22, 2014

I have written a C++ program that is supposed to open two text files (prog2a.dat and prog2b.dat) and write the contents of a specified range of lines to an output file (outfile.dat). I wrote a program that based on the example we were given (to take lines 5-15 from the first file and lines 4-12 of the second file and merge them into the output file) works perfectly. However, after asking my professor for some clarification on another part of the assignment, I found out I have not done this correctly. I have the code written so that it will always output the range of lines I mentioned earlier, but the program is actually supposed to allow the user to merge the files from the command line using whatever range they want by typing in the following command:

prog2 in1 5-15 in2 4-12 outfile

But I'm not sure how to tweak my current program to allow this to be done.

Here is the code that I have written, keep in mind that this works properly for the way it is written, but not how it is supposed to work for the purposes of the command line (hopefully that makes sense):

#include <iostream>
#include <fstream>
#include <cstdlib>
using namespace std;
int main() {
// Create output file
std::ofstream outFile("outfile.dat", ios::out);

[Code] .....

Is there any simple way to make this work as I described using the command line? Also, I am supposed to break this up into three files, a header file, the program file, and a test file (the test file contains main() and should close the 3 open files and display any error messages), but I'm getting really confused as to what should go in the header file. I know the header file should contain class definitions and constructors, but don't really know how to make that work for this specific program?

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C/C++ :: Calling Files From Command Line?

Apr 23, 2015

In the following program I have one input .txt file of random words.

Example:

DOOR FLAG APPLE
CAR

I need to create output .txt file which will invert and print every word in the next row.

Example:

ROOD
GALF
ELPPA
RAC

When I run the program with command line arguments:

program.exe FILEINPUT.TXT FILEOUTPUT.TXT

I get the output same as input.

Here is the program:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void form(char **a,char **b,int n,char* (*t)(char *));
void invert_words(char *);
void form(char **a,char **b,int n,char* (*t)(char *)) {

[code].....

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C++ :: How To Make A Program That Opens Unknown Files Extensions

Apr 6, 2013

Okay, so I think I have just passed the intermediate line in my skill of c++ and my question is how do I make a program that opens unknown files extensions. for example like .plr. Because I see a bunch of files for game modifications like that, that was a good reason I started c++ too.

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C++ :: Write A Program That Opens Two Text Files For Input?

Nov 23, 2013

I am trying to make a simple program, I would like it to be able to do the following, Write a program that opens two text files (input1.txt and input2.txt) for input .The program should write the followings in the two files. input1.txt:

This is the first line in input1.txt.
This is the second line in input1.txt.
This is the third line in input1.txt.
This is the fourth line in input1.txt.

input2.txt:

This is the first line in input2.txt.
This is the second line in input2.txt.
This is the third line in input2.txt.

What would be the best way to go about doing this? I wrote the program below, but I don't think that it works.

#include <iostream>
#include <fstream>
#include <string>
int main()
{
using namespace std;
string input1;

[Code]...

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C/C++ :: Searching Index Files From Linux Command Line

Oct 28, 2014

I have code that creates an index file created from a data file of records.

#include <iostream>
#include <fstream>
#include <map>

[Code]......

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C++ :: Input And Output Files - Names Should Be Read From Command Line

Aug 3, 2014

I am having an issue with the statement "Both the input and output files' names should be read from the command line." I don't understand what this means or what I need to do.

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C :: ANSI Program To Print Out Each Command Line Argument On Separate Line Using For Loop

Mar 5, 2013

I need to write a ANSI program to print out each command line argument on a separate line using a for-loop. also it need to print the name of the executable .so far I have

Code:

#include <stdio.h>
int main(int argc, char **argv) {
int i;
printf("")

[code]....

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C :: Program Which Writes Out Its Command Line Arguments In Reverse Order One Per Line?

May 7, 2013

l need to write a program which writes out its command line arguments in reverse order one per line. The output from the program should look like this:

% a.out Two roads diverged in a yellow wood
wood
yellow
a
in
diverged
roads
Two

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C++ :: How To Test A Program By Using Files Containing Tests

Sep 15, 2014

How to test a program by using files containing tests and with a go file i think.

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C++ :: Opens New Command Prompt Window For Input?

Oct 8, 2014

If I compile code which uses cin using the command prompt, then run the compiled program a new window opens when it reaches the cin line of code, for the input. If there is no cin used then all printing happens in the original window. Is there a way to stop this behavior of the opening of a new window?

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C/C++ :: Program That Opens Text File And Checks Usernames Listed In Text Files?

Jun 5, 2014

I want to make a program that opens a text file and checks the usernames listed in the text files to see if the names are registered on a site such as twitter. How easy would this be to make, what things would I need to know?

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C :: Incorporate Command Line Arguments Into Program?

May 26, 2014

In the following program, I have gotten it to work with IO redirection (not shown in this particular code), and have made some minor adjustments to get it to work with file processing. The only thing I have to do now is get it to work with command line arguments, and am slightly lost (and I have looked into it).

I basically just need to take a text file from a certain directory and send it to my program. Would need two files, an input and output file.

main.c
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "LAB_6B_7B.h"

[Code].....

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C/C++ :: How To Execute Program Through Command Line With Arguments

Aug 13, 2012

i wrote the c program for command line arguments,but i don't know how execute c program through command prompt

i did like this

d: cin>

then how should i proceed for execution

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C++ :: Program To Search Index File Using Command Line In Linux

Oct 28, 2014

I have code that creates an index file created from a data file of records.

#include <iostream>
#include <fstream>
#include <map>
#include <sstream>
#include <string>
#include <iomanip>
using namespace std;
class Record {

[Code]...

I now need to write a second program that allows the user to enter a command on the Linux command line such as

search 12382 prog5.idx

and returns the information for the record with that key. The code I included for the index file is correct and works properly, but how to write the second program.

Here is the index file created by the first program:

8: blank 0 $ 0.00
12165: Item16 30 $ 7.69
12345: Item06 45 $ 14.20
12382: Item09 62 $ 41.37
12434: Item04 21 $ 17.30
16541: Item12 21 $ 9.99
21212: Itme31 19 $ 8.35
34186: Item25 18 $ 17.75
41742: Item14 55 $ 12.36

The top line is a dummy record, the first number is the size of the file.

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C/C++ :: Unable To Create A Program That Takes Command Line Arguments And Prints Last One

Jan 18, 2015

I'm just getting back into the swing of things after a long time of not programming. I'm trying to create a program which takes in command line arguments and prints the last one. My code is as follows:

#include <iostream>
#include <vector>
#include <string>
using namespace std;
int main() {
string x;
vector<string> arguments;

[Code]...

And the error message I receive, a simple but frustrating one, is as follows:

Enter arguments, enter STOP to stop: Segmentation fault...

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C :: Test Is Not Recognized As Internal / External Command

Sep 11, 2013

My prog name is test and the problem is when i compile it gives error : 'test' is not recognized as an internal or external command,operable program or batch file.

Code:

#include <stdio.h>
#define ISDIGIT(y) ( y >= 48 && y <= 57 )
main( )
}

[code].....

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C++ :: Get Last Line Displayed By Another Command Line Window

Apr 14, 2013

I write a program which now works perfectly well. However, I want to make it run at the right time automatically, instead of waiting for a user to start it when needed.

The basic problem is, that in a WinPE environment an exe is running. Unfortunately it would need critical input, which must be inputted perfectly. So, I wrote a program which gets the data and sends it to the other app, by bringing it to the front and presses the keys needed using SendInput().

However, this program should wait for it's cue, then get on the inputting part. It's cue should be the point where the program waits for the first user input with this displayed on the last line:

Text:

My question is: how to listen and check whether the last line displayed is "Text:"?

I've tried with AttachConsole(), but for some reason it opens a new console window. I checked and the PID I'm using is the console window's, so I don't know why that happens.

The few lines I'm trying with:

HWND hwnd = FindWindow(NULL, "Administrator: Command Prompt");
SetForegroundWindow(hwnd);
SetFocus(hwnd);
DWORD process_id;
GetWindowThreadProcessId(hwnd, &process_id);

[Code] ...

Please don't criticize the first line. I know it can be ambiguous, but I modified it, When actually using it, the exe name will be in the title, so it will be unique.

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C :: Program That Opens A File In Notepad?

Mar 31, 2013

I need to write a c program that opens a file in note pad. The first line is the number 5, for how many rows of binary strings are to follow. Each line contains a string representing a binary number (with a maximum of 32 binary digits) The program is supposed to read this file, and convert each binary number to base 10.

This is the binary code to test:
5
0110010101010100100101
10110
10000

[Code]....

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C++ :: CPP Program That Opens Google Chrome And Goes To Specified URL

Dec 21, 2013

I've been searching for a long time to find a way to make a cpp program that opens google chrome and goes to a specified url and nothing is working. This is the current code i'm using but its not working because no one really specifies the includes & dlls necessary for execution or if they do they compile with errors....

This is the basic code i've been using. Apparently, ShellExecute is the preferred method to do it. Its not really turning out to be my favorite right now...

int main(){
ShellExecute(NULL, "open", "

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C :: Command Line Arguments

Jul 28, 2013

I am using visual studio 2010 c++ express for C/C++ programming but is novice here to take command line arguments..i did went to project->properties->debugging and specified there the command line arguments but it didnt work..i think i need to know the format to enter the arguments.

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C++ :: Command To Get A Line From The User

Sep 16, 2014

int get_command_line (char * sa) {
char * s;
char * l = fgets(s, 300*5, stdin);
int i = 0;
int j;
int n;

[Code] ....

The aim is to have the function return the number of arguments made after assigning each of the arguments to a c string stored in an array of five pointers. This is how I declare this:

int main(void)
int n;
char s0[300];
char s1[300];
char s2[300];
char s3[300];

[Code] ....

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C++ :: Using File From Command Line

Apr 13, 2013

I'm trying to read in a file specified in the command line but I'm having some trouble. The command line entry specifies the inputfile preceded by '<' and the output file preceded by '>' like so

./program -v < input_file.cmd > output_file.cmd

This is what I've got so far.

int main(int argc,char* argv[]){
string strv="-v";
string input="<";
string output=">";
string str;
string input_file;
const char* in=input_file.c_str();

[Code] .....

This compiles ok, but when i run it using :

./program -v < test1.cmd

I get a segfault, if i cout argc it returns '2' where i would expect for this command line entry, I 'd get 4.

I'm not yet outputting to file, just to the screen so im not specifying an output file yet.

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C/C++ :: How To Know Command Line Is Empty Or Not

Mar 13, 2013

I am writing a c++ program in Linux.. I am reading a line from commandline at run time using "getline(std::cin,str);". now, what i want is if i left the commandline as idle (terminal as idle), then i want to know that the commandline is empty... is it possible ???

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C++ :: Incorporate Button Into Current Program That Opens Up Calculator?

Nov 10, 2013

I want to incorporate a button into my current program that opens up a calculator in a different window. I have the code for the calculator and the program. I have never worked with buttons or windows.

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C++ :: Compiler Command Line Arguments

Jun 15, 2013

I have found this C++ online compiler (to use when I am at work): Compile and Execute C++ online

When you write and compile a program, on the right side (the "output" side), you can read this command line arguments:

$ g++ main.cpp -o demo -lm -pthread -lgmpxx -lreadline 2>&1

What is the meaning of the following arguments? -lm [link the math header file, right?]

-pthread
-lgmpxx
-lreadline

Any book (ebook, tutorial, printed book, whatever) where I can find all (absolutely all) these and other possible arguments?

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