I know () has higher precedence than <<, and << has higher precedence than ==, but I want to know why I can't write cout<<a==b; yet can write cout<<(a==b); in C++.
How the compiler translates cout<<a==b; and then shows error?
<< has higher precedence than == as you can see here.
The statement
cout<<a==b
is equivalent to
(cout<<a)==b
The expression
cout<<a
returns a stream. This stream is compared to b. If there is no left shift operator for a stream and a or no comparing operator for a stream and b this causes a compiler error
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