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.
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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