main's char *argv[] doesn't include arguments if stdin is file

Question

I'm a little newbie in C.

./main 7 4

This command in terminal causes that argv[1] = 7, argv[2] = 4.

./main <input.in

When I use redirecting of stdin in terminal, it only shows argc = 1(./main).

Is there any way how to solve this problem or do i have to try a different way?

Answer 1

You shell interprets the <file.txt as "send file.txt's contents to this processes' stdin", so your program will never see the <file.txt part.

There is no way to resolve this, as this is a deliberate feature of POSIX (and possibly other) shells.