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- EchoOn / EchoOff
- Put echo on during batch reading of a file
- Usage
- EchoOn()
EchoOff()
- Arguments
- No argument.
- Returned Object
- No returned value.
- Description
- When a file is run in batch, using: aml -i filename
- Description
- No output is made of the computations made within the file. It is possible to change this by writing in the file ''filename'' the command EchoOn(). As soon as it is read, aml outputs the results of subsequent computation on the standard output. The effect of this command can be cancelled by the command EchoOff().
- Note
- These functions can be used for debugging a batch file as follows: in order to trace the different steps of a program, the user can call EchoOn() and insert debugging strings in the file. Since STRINGs objects are evaluated as strings of characters, the resulting STRING will be output to the standard output as soon as a STRING object is encountered in the batch file. When a particular debugging STRING is output to the screen, the user thus knows that a particular step of computation has been reached.
- See Also
- Display
Examples
# example of a batch file
EchoOn()
# string object which will be echoed to the screen,
# indicating to the user which step of computation is being computed
"step1"
1+4
"step2" # another debugging string
+2
EchoOff()
Sqrt(10)
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