int main(int argc, char *argv[])

Question

If I have this:

int main(int argc, char *argv[])

In the body, you can sometimes find programs using argv[1].

When do w

Answer 1

Let's suppose your C++ executable file is:

/home/user/program (or C:\program.exe in Windows)

if you execute:

./home/user/program 1 2 (or C:\program.exe 1 2 in Windows)

argv[0] = /home/user/program (C:\program.exe)
argv[1] = 1
argv[2] = 2

That is because:

• argv[0] is the path of the executable file
• argv[1] is the 1st argument

Edit:

Now I see that argv[0] isn't necessarily the path of the executable file.
Read the following SO question: Is args[0] guaranteed to be the path of execution?