Checkpoint C

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At this point you should understand:

• the general idea of verb debugging
• how control words create control structures by grouping sentences into blocks
• what the T block test result is
• how the test result determines which B block to execute
• how the test result determines when control structure execution is finished

Check your understanding by doing the following exercises:

• debug step through your convert verb
• create a temporary script file and define a verb called conv that is similar to convert, but insists on a 'f' argument to do the conversion to Fahrenheit and gives a string result indicating there was an error if the left argument is neither 'c' nor 'f'.
  
  Hint: use the control structure sketched out here:

if. x = 'c' do. ...
  elseif. x = 'f' do. ...
  elseif. 1 do. 'left arg not c or f'
end.

or try a select. structure.



• create a temporary script file and define a dyad called plus that adds its left argument to its right. But, if there is an error, it should give a string result.
  
  Hints:
  • use dyad : 0;
  • 4 plus 9 should return 13;
  • 'a' plus 9 should return your error string (perhaps, 'there was an error');
  • Use a try. control structure to catch the error and give the string result.

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