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As far as I can see there are 3 ways to use booleans in c
#define FALSE 0 ... #define TRUE !(FALSE) are there other methods I missed? What are the pros and cons of the different methods?
I suppose the fastest would be number 3, 2 is more easily readable still (although bitwise negation will slightly add to overhead), 1 is most readable not compatible with all compilers.
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Boolean Variables and Data Type ( or lack thereof in C ) A true boolean data type could be used for storing logical values, and would only have two legal values - "true", and "false". C does not have boolean data types, and normally uses integers for boolean testing.
In C, Boolean is a data type that contains two types of values, i.e., 0 and 1. Basically, the bool type value represents two types of behavior, either true or false. Here, '0' represents false value, while '1' represents true value. In C Boolean, '0' is stored as 0, and another integer is stored as 1.
A boolean is a data type in the C Standard Library which can store true or false . Every non-zero value corresponds to true while 0 corresponds to false . The boolean works as it does in C++.
A Boolean variable has only two possible values: true or false. It is common to use Booleans with control statements to determine the flow of a program. In this example, when the boolean value "x" is true, vertical black lines are drawn and when the boolean value "x" is false, horizontal gray lines are drawn.
Just include <stdbool.h> if your system provides it. That defines a number of macros, including bool, false, and true (defined to _Bool, 0, and 1 respectively). See section 7.16 of C99 for more details.
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