#ifdef
        
        #ifdef — 
      Conditional reading of code.
                
       
      
        
        Description
        
      If a macro is defined then #ifdef can
    incorporate text into an orchestra upto the next
    #end.  
    This is similar to, but independent of, the macro system in the score
    language.  
    
       
      
        
        Syntax
        #ifdef NAME
        ....
        #else 
        ....
        #end 
       
      
        
        Performance
        
      Note that the #ifdef can be nested, like in the C preprocessor language.
    
       
      
        
        Examples
        
      Here is a simple example of the conditional.
      
        
          
          
            Example 14. Simple example of the #ifdef form.
          
          
            
#define debug
     instr 1
#ifdef debug
     print "calling oscil"
#end
     a1   oscil 32000,440,1
     out  a1
     endin
           
         
        
    
       
      
      
        
        Credits
        
      
        
          
            | Author: John ffitch | 
          
            | University of Bath/Codemist Ltd. | 
          
            | Bath, UK | 
          
            | April 2005 | 
        
        
    
        New in Csound5 (and 4.23f13)