Arduino else if command8/16/2023 This task is in the form of a conditional statement called an if else. The #elif is functionally equivalent to the #elseif directive. So, if Arduino reads the push-button switch an even number of times it will. Processing continues similar to an ifdef directive. The expression #ifndef Name evaluates to true in Name has The Value TEST2_DEFINED_WITHOUT_A_VALUE (test2) is defined ![]() TEST1 is NOT Defined, and TEST2 (test2) is defined TEST1 (test1) is defined and TEST2 is not defined #ifdef TEST2 // another check (nested within the first) * process the input based on the what was defined above */ The following sample code showing use of the #ifdef directive chain with nested #ifdef directives can be nested, however, all directives inĪ given logical level must exist in a single file. Input is evaluated until an #endif directive is encountered.Ī #endif directive ends the #ifdef processing. #else directive is processed if it exists. If all #elseif directives evaluate to be false, the If an #ifdef is evaluated to be false, then the #elseifĭirective is processed as if it was an #ifdef directive. Test1 and test2 are not defined, test3 is defined If the condition is true, the instructions will be executed written inside (that is, inside the opening and closing braces) and you can use if/else to run a set of code if the condition is true the if block will be run, and if it false the else block. Test1 is not defined, test2 is defined, test3 is unchecked if and if / else statement: if statement in Arduino is used to check if a certain condition is true (True, 1) or false (false, 0). Test1 is defined, test2 and test3 are unchecked If the #ifdef directive evaluated to be true, In this case (true), the input file linesĪre processed until a #elseif, #else, or #endifĭirectives are valid only following a #ifdef directive. The expression #ifdef Name evaluates to true in Name has #ifndef Name0 lines to evaluate if Name0 is Not defined #elseif Name1 lines to evaluate if Name1 is defined, and Name0 is defined #else lines to evaluate if Name0 is defined and Name1 is Not defined #endif #elif NameN lines to evaluate if NameN is defined, and Name0-Name(N-1) is Not defined #else lines to evaluate if Name0-NameN are Not defined #endif ![]() #ifdef Name0 lines to evaluate if Name0 is defined #elseif Name1 lines to evaluate if Name1 is defined, and Name0 is Not defined The syntax of the conditional directives are: #endif are the logical directives of the preprocessor.įate of information processed the preprocessor. ![]() Next: #echo - #error Up: Preprocessor directives Previous: #undef #ifdef - #ifndef - #elseif - #elif - #else - #endif
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