General C coding notes and Examples

SWITCH( ) Statement

Allows easy testing of multiple values.

1. The constant 'test', having been assigned the value of 3, would work as shown.

2. 5 and 1 would execute the same code.

3. Always use the 'DEFAULT' case, some compilers will behave oddly and possibly generate a lot of extra code if it is not included.

4. An omitted [BREAK;] at the end a block will have the effect of running extra code. ie, omitting the [BREAK;] in the [CASE 0:] block will allow a value of 0 to run "code 0" and "code 5/1"

CHAR temp;
CHAR CONST test = 3;

SWITCH (temp){
    CASE 0:
        {
        //code 0
        BREAK;
        }
    CASE 5:
    CASE 1:
        {
        //code 5/1
        BREAK;
        }
    CASE test:
    CASE 3:
        {
        //code test/3
        BREAK;
        }
    DEFAULT:
        BREAK;
    }