devc++ input from file does not work - c++

Question

I'm trying to redirect a .txt content to .exe
program.exe < file.txt
and contents of file.txt are
35345345345
34543534562
23435635432
35683045342
69849593458
95238942394
28934928341
but the first index in array is the file path and the file contents is not displayed.
int main(int argc, char *args[])
{
for(int c = 0; c<argc; c++){
cout << "Param " << c << ": " << args[c] << "\n";
}
system("PAUSE");
return EXIT_SUCCESS;
}
Desired output:
Param0: 35345345345
Param1: 34543534562
Param2: 23435635432
Param3: 35683045342
Param4: 69849593458
Param5: 95238942394
Param6: 28934928341

Answer 1

The myapp < file.txt syntax passes to stdin (or cin if you prefer), not the arguments.

Answer 2

You have misunderstood what argc and argv are for. They contain the command line arguments to your program. If, for example, you ran:
program.exe something 123
The null terminated strings pointed to by argv will be program.exe, something, and 123.
You are attempting to redirect the contents of a file to program.exe using < file.txt. This is not a command line argument. It simply redirects the contents of the file to the standard input of your program. To get those contents you will need to extract from std::cin.

Answer 3

When you say "but the first index in array is the file path and the file contents is not displayed." it sounds like you're trying to read input from argv and argc. The angle bracket shell operator does not work that way. Instead, stdin (what cin and several C functions read from) has the contents of that file. So, to read from the file in the case above, you'd use cin.
If you instead really wanted to have a file automatically inserted into the argument list, I can't help you with the windows shell. However, if you have the option of using bash, the following will work:
program.exe `cat file.txt`
The backtick operator expands into the result of the command contained within, and so the contents are then passed as arguments to program.exe (again, under the bash shell and not the windows shell)

Answer 4

This code does what i was expecting to do with the other one. Thanks everybody who helped.
#include <iostream>
#include <string>
using namespace std;
int main()
{
string line;
while (getline(cin, line))
cout << "line: " << line << '\n';
}