Robust And Secure Programming
Gbogbo ọrọ náà
Ask a program for a number between 1 and 10 and somebody will type 0, and somebody else will type 11, and somebody else will type seven, and somebody else will press Enter without typing anything at all. None of those people is being difficult. They are what a user is, and a program that only works when it is given exactly what it expected is not finished.
This lesson covers the three things the specification asks for here. Writing simple data validation routines, using the checks it names by example: a minimum length, an empty string, and a number within a given range. Writing a simple authentication routine using a username and a password. And selecting suitable test data that covers normal, or typical, boundary and erroneous cases, and being able to justify the choice. That last objective is the one candidates prepare for least and it is worth as many marks as the other two.
Ebumnobi
- Be able to write simple data validation routines.
- Be able to write simple authentication routines.
- Be able to select suitable test data that covers normal (typical), boundary and erroneous data. Be able to justify the choice of test data.
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
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Akwụkwọ Ọmụmụ
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Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Robust And Secure Programming. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which of these is a data validation check named in the specification? A. Checking that a password has been encrypted B. Checking that a string is not empty C. Checking that a name is spelled correctly D. Checking that a user is over 18 by asking twice Answer: B
- A routine accepts values from 20 to 40 inclusive. Which is a boundary test value? A. 0 B. 30 C. 41 D. forty Answer: C
- Which loop structure is most appropriate for a validation routine? A. A FOR loop B. A REPEAT UNTIL loop C. A nested FOR loop D. No loop is needed Answer: B
- In an authentication routine, why should the failure message not say which of the username and the password was wrong? A. It would make the message too long B. It would confirm to a guesser that a username exists C. The program cannot tell which was wrong D. The specification forbids messages Answer: B
- What does validation check? A. That the data entered is true B. That the data entered is reasonable C. That the user is who they claim to be D. That the program has no syntax errors Answer: B
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