VSMechatronics/C19/DefineExamples/define_example.c

#define UP 1
#define DOWN 2

int main()
{
    int i = 1;
    
    if (i == UP )
    {
        // Do something
    }
    
    if ( i == DOWN)
    {
        // Doe something else
    }
    return 0;
}