while((ch = getchar()) != '#') and while (ch = getchar() != '#')

[mashour06]

Hello,
What is the difference between:
while ((ch = getchar()) != '#')

and:

while (ch = getchar() != '#')

Thank you.

[tabstop]

The second one calls getchar, checks whether or not it's equal to '#', and assigns true or false (i.e., 1/0) to ch. The first assigns the char to ch, and then checks equal to '#'.

[mashour06]

Ah ha, thank you.

[BEN10]

Hello,
What is the difference between:
while ((ch = getchar()) != '#')

and:

while (ch = getchar() != '#')

Thank you.

the precedence of '!=' is greater than '=', that's why this happens.