opening a file in DOS

How can I open another .exe file in my DOS-program.

do you mean execute another exe or open it and view the content?

system("MyProgram.exe"); will execute it, also look into the various spawn and exec functions

otherwise:

This code reads the contents of a file

Code:

FILE *fptr;  //file pointer

fptr=fopen("MyFile.txt", "rb"); //open file as read binary mode

while(YourMomIsFat)  //usually check for eof or something
{
    variable=fgetc(fptr);  //read a byte
    UseVariableInSomeWay();
}

there are numerous other ways to read from a file but this is just one.

in c++

Code:

#include <iostream>
#include <fstream>
...
ofstream fout=("c:\\whatever\\new.txt");
if (!fout.is_open())
{
     cerr<<"Oops, file can't be created or opened."<<endl;
     exit(1);
}
fout<<"Some Text"<<endl;
fout.close();

ifstream fin=("c:\\whatever\\new.txt");
if (!fin.is_open())
{
     cerr<<"Oops, file can't be opened."<<endl;
}
fin>>someText;
cout<<someText;
fin.close();
...

In English:

Code:

Open file.txt and read it.

One line of code, the obvious best choice

There are standard functions in C. All compilers are supposed to have them. Same deal with C++.

well duh!!! But thats not why hes asking, you cant expect someone to know all the standard c/c++ functions and understand exactly how to use them.

Thanks people....

http://www.rt.com/man/execl.3.html

There are several functions that allow you to excecute a file and are better to use than system("whatever.exe").

Do I hear an echo in here? Also, dont trust that include file, I dont think its dos standard.

Originally posted by thedumbmutt
well duh!!! But thats not why hes asking, you cant expect someone to know all the standard c/c++ functions and understand exactly how to use them.

True, but I'd say that most people who have been programming for a while know a pretty good deal of them (if not all of them) and how to use those that they know of. The c standard library isn't a very big library.

But he did ask, so that would suggest he needed some sort of help, examples are nice sometimes.

You're good at picking nicknames, I'll give you that.