Newsgroup: comp.lang.c++
Subject: Range of enumerations according to Stroustrup
From: Peter <pilarp@...>
Date: Sat, 14 Sep 2013 11:55:06 -0700 (PDT)
In Stroustrup's book the following statement can be found:
"The range of an enumeration holds all the enumeration's enumerator values rounded up to the nearest larger binary power minus 1. The range goes down to 0 if the smallest enumerator is non-negative and to the nearest lesser negative binary power if the smallest enumerator is negative".
The statement is followed by an example which contradicts the rule stated above:
enum e3 { min = -10, max = 1000000 }; // range -1048576:1048575
Why would the lower limit be -1048576? The smallest enumerator is -10 and the nearest negative binary power lesser than -10 is -16, not -1048576.
Subject: Range of enumerations according to Stroustrup
From: Peter <pilarp@...>
Date: Sat, 14 Sep 2013 11:55:06 -0700 (PDT)
In Stroustrup's book the following statement can be found:
"The range of an enumeration holds all the enumeration's enumerator values rounded up to the nearest larger binary power minus 1. The range goes down to 0 if the smallest enumerator is non-negative and to the nearest lesser negative binary power if the smallest enumerator is negative".
The statement is followed by an example which contradicts the rule stated above:
enum e3 { min = -10, max = 1000000 }; // range -1048576:1048575
Why would the lower limit be -1048576? The smallest enumerator is -10 and the nearest negative binary power lesser than -10 is -16, not -1048576.
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