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    <p>You could create masks for each of the groups:</p> <pre><code>typedef enum { AN_TRISTATE_0 = 0x00001, AN_TRISTATE_1 = 0x00002, AN_TRISTATE_MASK = 0x0000f, AN_NOTHING = 0x00010, // Should this be 0x00000 ? AN_MOTOR_1 = 0x00100, AN_MOTOR_2 = 0x00200, AN_MOTOR_3 = 0x00400, AN_MOTOR_MASK = 0x00f00, AN_SENSOR_1 = 0x01000, AN_SENSOR_2 = 0x02000, AN_SENSOR_3 = 0x04000, AN_SENSOR_4 = 0x08000, AN_SENSOR_5 = 0x10000, AN_SENSOR_MASK = 0xff000 } adc_pin_func_t; </code></pre> <p>And then simply test a group against the mask using the <code>&amp;</code> operator:</p> <pre><code>if (a_particular_pin &amp; AN_SENSOR_MASK) { // it's a sensor pin } else if (a_particular_pin &amp; AN_MOTOR_MASK) { // it's a motor pin } </code></pre> <p>EDIT: As others have suggested using a range, then you could probably create a macro for the test, which would allow you to change how the test is performed without the need to change the code (always a good thing):</p> <pre><code>#define IS_AN_SENSOR(x) (((x) &amp; AN_SENSOR_MASK) != 0) #define IS_AN_MOTOR(x) (((x) &amp; AN_MOTOR_MASK) != 0) // etc. </code></pre> <p>and then the test becomes:</p> <pre><code>if (IS_AN_SENSOR(a_particular_pin)) { // it's a sensor pin } else if (IS_AN_MOTOR(a_particular_pin)) { // it's a motor pin } // etc </code></pre> <p>If you then needed to change to using a range then only the macros need to change (and you'd obviously need to define the range min/max):</p> <pre><code>#define IS_AN_SENSOR(x) ((x) &gt;= AN_SENSOR_START &amp;&amp; (x) &lt;= AN_SENSOR_END) // etc </code></pre>
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    1. COBetter than my answer in my opinion as less idiosynchratic. +1
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    2. COI agree, bitmasking is best method
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