Validation and Verification of Input Data

Validation and Verification of Input Data

2210 Computer Science

​Syllabus Check

​Understand the need for validation and verification checks to be made on input data (validation could include range checks , length checks,type checks and check digits).

Multiple Choice

What do you think is the best reason why we need to validate and to verify input data of programs?

• to guarantee that the data we enter is error-free.

• nothing

• for fun

Multiple Select

What are the possible errors in an input data?

• omitted data

• mistype data

• misread word/value

Multiple Choice

An automatic check to make sure data is sensible and possible.

• Validation

• Verification

Multiple Choice

A check to see if the data entered is correct.

• Validation

• Verification

​Validation

• ​automated checking by a program that data is reasonable,and/or within set bounds before it is accepted into a computer system.

• ​types of validation checks:

  • ​range check

  • ​presence check

  • ​type check

  • ​lookup

  • ​length check

  • ​format check

​Types of Validation Check

​

Multiple Choice

Specifies that data entered must be numerical data in a range.

• range check

• presence check

• type check

• lookup

• length check

​Range Check

• ​Specifies that data entered must be numerical data in a range.

​_______________________________________________​

Program requirement:

Display A* if the mark entered is 90-100.

​

​Validation statement:

​If mark >=90 AND <=100

​THEN

​PRINT "A*"

Multiple Choice

Given the range check validation statement to identify if the age belongs to Generation X:

IF age >33 AND <48

input = 40

Is it accepted or rejected?

• Accept (Valid)

• Reject (Invalid)

Multiple Choice

Specifies that data entered has to be a certain number of characters long.

• presence check

• type check

• lookup

• length check

• format check

​Length Check

• ​Specifies that data entered has to be a certain number of characters long.

​_______________________________________________​

Program requirement:

A password with 8 characters.

​

​p@s5w0rd (valid)

​l3tme1n (invalid)

Multiple Select

Program requirement: password with 8 characaters. Which are the valid input data?

• pl4y5taxon

• l3g0

• c0Lorwh3

• yomekid