How to pass in command line arguments when using ideone

0 votes
To test some C++ and Python programmes, I'm using the ideone online interpreter (http://ideone.com/).

Instead of using the STDIN input, how do I specify command line arguments?
Jun 6 in C++ by Nicholas
• 5,300 points
29 views

1 answer to this question.

0 votes

It appears that you won't be able to, however a fast hack should suffice:

static char * const ARGV[] = { "myprog", "hello", "world", NULL };

int main(int argc, char * argv[])
{
    argc = 3;
    argv = ARGV;

    // ...
}

Alternatively, you may transform the standard input to args:

#include <vector>
#include <string>
#include <iterator>
#include <iostream>

std::vector<char *> fabricate(std::vector<std::string> & v)
{
    std::vector<char *> res(v.size() + 1, NULL);
    for (std::size_t i = 0; i != v.size(); ++i) { res[i] = &v[i][0]; }
    return res;
}

std::vector<std::string> args_vector((std::istream_iterator<std::string>(std::cin)), std::istream_iterator<std::string>());

std::vector<char *> argv_vector = fabricate(args_vector);


int main(int argc, char * argv[])
{
    argc = args_vector.size();
    argv = argv_vector.data();

    // ...
}
answered Jun 21 by Damon
• 4,960 points

Related Questions In C++

0 votes
0 answers

How to traverse stack in C++?

Is traversing std::stack possible in C++? It is not possible to traverse using the following method.  Because there is no member end in std::stack. std::stack<int> foo; // .. for (__typeof(foo.begin()) it = foo.begin(); ...READ MORE

Jun 1 in C++ by Nicholas
• 5,300 points
72 views
0 votes
1 answer

How to use enums in C++

This will be sufficient to declare your ...READ MORE

answered Jun 20 in C++ by Damon
• 4,960 points
18 views
0 votes
1 answer

How to convert string to char array in C++?

Simplest way I can think of doing ...READ MORE

answered Jun 20 in C++ by Damon
• 4,960 points
46 views
0 votes
1 answer

When to use extern in C++

This is useful when dealing with global variables.  Global variables are declared in a header so that any source file that contains the header is aware of them, but you only need to "define" them once in one of your source files. To explain, using extern int x; informs the compiler that an int object named x exists elsewhere.  It is not the compiler's responsibility to know where it exists; it just needs to know the type and name so that it may utilise it.  After compiling all of the source files, the linker will resolve all x references to the one definition found in one of the generated source files. For it to operate, the x variable's declaration must have "external linkage," which simply means that it must be defined outside of a function (at what's known as "the file scope") and without the static keyword. header: #ifndef HEADER_H #define HEADER_H // any source file that ...READ MORE

answered Jun 21 in C++ by Damon
• 4,960 points
22 views
0 votes
2 answers
+1 vote
2 answers

how can i count the items in a list?

Syntax :            list. count(value) Code: colors = ['red', 'green', ...READ MORE

answered Jul 7, 2019 in Python by Neha
• 330 points

edited Jul 8, 2019 by Kalgi 2,916 views
0 votes
1 answer
0 votes
1 answer

How to use std::sort to sort an array in C++

We receive std::begin and std::end in C++0x/11, which are overloaded for arrays: #include <algorithm> int main(){ int v[2000]; ...READ MORE

answered Jun 1 in C++ by Damon
• 4,960 points
39 views
0 votes
1 answer

How to use new[ ] and delete[ ] operator in C++

int main(){ char *str; ...READ MORE

answered Jun 20 in C++ by Damon
• 4,960 points
25 views
webinar REGISTER FOR FREE WEBINAR X
Send OTP
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP