how to execute an excutable file

[Nofriyadi Nurdam <nnurdam_rh yahoo com>]

Hi all,
 
 I have compiled the program "HelloWorld.c". 
 The C compiler gave me the executable file a.out as output.
 As I executed the a.out in console, I got answer "command not found".
 Is there someone who can tell me about that.
 
 Thanks in advance
 Nofriyadi

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