Testing, debugging and error types

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Notes de leçon Diapos Questions d'entraînement

Notes de leçon

Types of error

A syntax error violates language grammar, such as a missing required bracket; a compiler or interpreter reports it before executing the affected code.
A logic error produces unintended behaviour despite syntactically valid code.
A runtime error arises during execution, such as a rejected out-of-range access. Errors can be handled; they do not invariably crash the whole application.

Program error types

Testing

Test data types: normal (valid), boundary (at the edge of valid ranges) and erroneous (invalid). For age 18-65: normal 30; boundary 18, 65 (and 17, 66 as invalid boundaries); erroneous "abc".
A test plan lists inputs, expected outputs and actual outputs.
Iterative testing: testing during development. Final/terminal testing: at the end against the specification.

Test data categories

Debugging tools

Trace tables, breakpoints, stepping through code, watch windows, print statements; IDE error messages.

Debugging tools

Good practice

Write comments, meaningful names, modular code; test each module; fix one error at a time.

Defensive design

Anticipate misuse and handle errors gracefully.

Diapos

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Questions d'entraînement

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1.What is a bug?
Easy
- Aan error in a program
- Ba feature
- Ca variable
- Da loop
2.What is debugging?
Easy
- Afinding and fixing errors
- Bwriting code
- Ccompiling
- Drunning
3.A program runs to completion but calculates the wrong result because its algorithm is incorrect. What type of error is this?
Easy
- Alogic error
- Bsyntax error
- Cruntime error
- Dhardware error
4.Which error is caused by a missing bracket?
Easy
- Asyntax error
- Blogic error
- Cruntime error
- Dnone
5.What is erroneous test data?
Easy
- Ainvalid data that should be rejected
- Bvalid data
- Cboundary data
- Dno data
6.For valid ages 18 to 65, which is boundary data?
Easy
- A18
- B30
- C"abc"
- D100
7.For valid ages 18 to 65, which is normal data?
Easy
- A30
- B17
- C66
- D"abc"
8.What does a breakpoint do?
Easy
- Apauses the program at a chosen line
- Bends the program
- Cadds a loop
- Ddeletes code

Plus de questions

9.What does a trace table show?
Easy
- Avariable values step by step
- Berror messages
- Cfile sizes
- Dnetwork traffic
10.What is a test plan?
Easy
- Aa table of tests, expected results and actual results
- Ba list of bugs
- Ca flowchart
- Da loop
11.What is iterative testing?
Easy
- Atesting throughout development
- Btesting at the very end only
- Ctesting hardware
- Dno testing
12.What type of error is using×instead of + in a sum?
Medium
- Alogic error
- Bsyntax error
- Cruntime error
- Dnone
13.In a language that checks array bounds at runtime, what happens when an out-of-range index is accessed?
Medium
- Aruntime error
- Bsyntax error
- Clogic error
- Dnone
14.An integer input range is 1–10 inclusive. Which group tests both endpoints and the values immediately outside them?
Medium
- A0, 1, 10, 11
- B5 only
- C1000 only
- Dnone
15.Why test boundary data?
Medium
- Amany errors occur at limits
- Bthey are easy
- Cthey are rare
- Dthey are identical to normal
16.What is final testing?
Medium
- Atesting the whole program against requirements at the end
- Btesting one line
- Ctesting hardware
- Dwriting code
17.What does stepping through code do?
Medium
- Aruns the program one line at a time
- Bdeletes lines
- Ccompiles
- Dcompresses
18.A program sorts [3,1,2] but outputs [1,3,2]. What error type is this?
Medium
- Alogic error
- Bsyntax error
- Cruntime error
- Dhardware error
19.What is a good first step when a program crashes?
Medium
- Aread the error message and find the line
- Bdelete the program
- Cignore it
- Dre-install
20.Why use comments in code?
Medium
- Ato explain code and aid maintenance
- Bto slow the program
- Cto hide errors
- Dto add data
21.Why test each module separately?
Medium
- Aeasier to find where errors are
- Bto avoid testing
- Cto slow work
- Dno reason
22.What is 'expected output'?
Easy
- Athe result the test should produce
- Bthe actual result
- Can error
- Da loop
23.What is 'actual output'?
Easy
- Awhat the program really produces
- Bwhat is expected
- Cthe plan
- Dthe data
24.What is a watch window?
Medium
- Aa tool showing variable values during running
- Ba hardware part
- Ca loop
- Da flowchart
25.What should you do after fixing a bug?
Medium
- Aretest to check it works and did not break anything
- Bignore
- Cdelete tests
- Dstop
26.A syntax error breaks the rules of the language.
Easy
True or false?
27.A logic error produces wrong output.
Easy
True or false?
28.A logic error stops the program compiling.
Easy
True or false?
29.Boundary data tests the limits of an input range.
Easy
True or false?
30.Testing is only done once at the end.
Medium
True or false?
31.Which are types of test data?
Medium
- Anormal
- Bboundary
- Cerroneous
- Drandom sleep
- Ecompile
32.Which are debugging tools?
Medium
- Atrace table
- Bbreakpoint
- Csingle stepping
- Dwatch window
- Emonitor brightness control
33.Explain how you would choose test data for a program that accepts marks from 0 to 100.
Medium

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