CODEWITHSUNDEEP
c++
user5401362
user5401362

Reputation:

Why does logical OR operator not evaluating the parenthesized right hand side condition first?

Consider the code:

int i=2, j=3;
if(i<5 or (++i==j))
    cout << "i=" << i;

The output is:

i=2

Why not using parenthesis have any effect in the above condition? Why not the output is 3?

compiler: g++ 4.8.2 on Ubuntu 14.04LTS

Upvotes: 0

Views: 86

Answers (1)

Bathsheba
Bathsheba

Reputation: 234635

or is the same as ||, which performs a short-circuit evaluation from left to right. This means that once the result of the expression containing || is known, evaluation stops.

(|| is also a sequencing point, so the behaviour is well-defined even in the case where i >= 5).

Since i < 5 is true, the other expression is not computed; so i is not incremented.

Upvotes: 6

Related Questions