this version of getchar/putchar removes a character from output

So here is short/simple program that just takes your keyboard input, and outputs it when you press enter:

Code:

---

#include<stdio.h>
#include<stdlib.h>


int main()
{
  int c = getchar();


  while(c != EOF)
  {
      putchar(c);
      c = getchar();
  }
}

---

In "The C Programming Language" book, the author says doing this is more terse equivalent:

Code:

---

int main()
{
  int c = getchar();


  while((c = getchar()) != EOF)
  {
      putchar(c);
  }
}

---

However, the behavior is slightly different, on the first input, it removes a character. I can't figure out why:

Code:

---

a

abc
abc


---

> int c = getchar();
> while((c = getchar()) != EOF)
There are two calls to getchar before you get to your first putchar.

Quote:

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Originally Posted by Salem

> int c = getchar();
> while((c = getchar()) != EOF)
There are two calls to getchar before you get to your first putchar.

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Lol, that's correct, so it "consumes" a character.

Missing these little things makes me feel so dumb.