Simple question on while loops

why does this work

Code:

---

printf ("Please enter a sentence");
while ((ch = getchar()) != '.') {  //i know that '\n' would terminate on new line character
if (ch == '.' || ch == '!' || ch == '?')
break;
sentence[i++] = ch;

---

but this doesnt?

Code:

---

printf ("Please enter a sentence");
while ((ch = getchar()) != '.' || ch != '!' || ch != '?') {
sentence[i++] = ch;

---

the scond code doesn't teminate

Can you think of a value for ch where

Code:

---

ch != '.' || ch != '!' || ch != '?'

---

could possibly be false?

think that i'm getting this wrong but from what i understand this means.....

the value is true as long as ch does not equal '.' or '!' or '?'

Right. And since ch can never equal all three of those at the same time, that means it is always true.

hahahhahahahahaahah, lol, i'm an idiot!!!

tks