Difference between revisions of "Enum"
(Created page with "'''<code>enum</code>''' can be used to create an '''enumerated type''', which is a datatype in which constants can be named and values are automatically assigned. If the <cod...") |
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'''<code>enum</code>''' can be used to create an '''enumerated type''', which is a datatype in which constants can be named and values are automatically assigned. | '''<code>enum</code>''' can be used to create an '''enumerated type''', which is a datatype in which constants can be named and values are automatically assigned. | ||
− | If the <code>bool</code> data type did not exist in C++, one could be created and used follows: | + | If the <code>bool</code> data type did not exist in C++, one could be created and used as follows: |
<source lang="cpp"> | <source lang="cpp"> | ||
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return (0); | return (0); | ||
} | } | ||
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</source> | </source> | ||
Latest revision as of 13:19, 27 January 2018
enum
can be used to create an enumerated type, which is a datatype in which constants can be named and values are automatically assigned.
If the bool
data type did not exist in C++, one could be created and used as follows:
#include <iostream>
enum bool {false, true};
// false is automatically assigned the value 0
// true is automatically assigned the next integral value after false, which is 1
using namespace std;
int main()
{
bool var = false;
var = true;
if (var)
cout << "This statement will always print" << endl;
return (0);
}
The datatype can, like structs, be declared globally.
More details:
- Each identifier in the list of constants must adhere to standard identifier rules
- The identifier for the data type name must adhere to standard identifier rules
- Individual constant identifiers can be set equal to specific values and, if this is done, later identifiers without explicit assignments take on the previous identifier's value plus 1 (e.g. with
enum mytype {first = 5, second};
,second
is assigned a value of 6) - For much more information, see http://en.cppreference.com/w/cpp/language/enum