Quiz7-InputValidation

Question 1

An input validation loop is sometimes called an ERROR HANDLER(T/F)

Answer 1

True

Question 2

If a user is asked to enter the number of widgets he or she wants to buy and enters “two”, the program will automatically change the entry to an integer(T/F)

Answer 2

False

Question 3

If a user is asked to enter the number of widgets he or she wants to buy, the iSINTEGER function can be used to validate this input.(T/F)

Answer 3

True

Question 4

Programs should be designed to inspect all input before processing that input.(T.F)

Answer 4

True

Question 5

A priming read is needed when a pretest loop is executed.(T/F)

Answer 5

True

Question 6

A Boolean function can often be used to validate data(T/F)

Answer 6

True

Question 7

The most difficult input error to validate is an empty read.(T/F)

Answer 7

False

Question 8

Defensive programming is the practice of anticipating errors that can happen while a program is running and designing the program to catch and deal with those errors.(T/F)

Answer 8

True

Question 9

Checking for the accuracy of data, even when the user provides valid input, is part of input validation. (T/F)

Answer 9

True

Question 10

Checking that input data is reasonable is programmatically impossible.(T/F)

Answer 10

False

Question 11

Input validation is not needed if the program is well designed.(T/F)

Answer 11

False

Question 12

A programmer is not permitted to use library functions for input validation.(T/F)

Answer 12

False

Question 13

What do computer programmers say about the fact that computers can’t tell the difference between good and bad data?

Answer 13

Garbage in, Garbage out

Question 14

The purpose of _____________ is to get the first input value for the validation of a loop.

Answer 14

The priming read

Question 15

Designing a program to avoid common errors is called ____________ programming.

Answer 15

defensive

Question 16

Input ___________ is commonly done with a loop that iterates as long as an input variable contains bad data.

Answer 16

validation

Question 17

A(n) ___________ is another term for input validation.

Answer 17

Error Trap

Question 18

The priming read is placed __________ the loop.

Answer 18

Before

Question 19

If the user, when asked for his/her date of birth, enters a date in the future, this error should be caught by a ____________ check.

A) date
B) time
C) reasonableness

Answer 19

C) reasonableness

Question 20

Accepting February 29 for input only in a leap year is a check that should be caught by a ____________ check.

A) date
B) time
C) reasonableness

Answer 20

A) date

Question 21

Which function could be used to validate an entry for a user’s chosen name that must be between 4 and 12 characters?

Answer 21

legnth

Question 22

Which function could be used to validate that the correct data type was input for an amount of money?

A) isReal
B) isString
C) Legnth

Answer 22

A) isReal

Question 23

Which function could be used to simplify the process of string validation?

A) isReal
B) isString
C) toLower

Answer 23

toLower

Question 24

What would display if the following statements are coded and executed and the user enters 3 twice at the prompts?

Display “Enter your age:”
Input age
Do
Display “Impossible! Enter an age greater than 0:”
Input age
While age <=0
Display “Thank you”

A) Impossible! Enter an age greater than 0:

B) Thank you.
Impossible! Enter an age greater than 0:

C) Impossible! Enter an age greater than 0:
Thank you.

Answer 24

C) Impossible! Enter an age greater than 0:
Thank you.

Question 25

What would display if the following statements are coded and executed and the user enters -3 at the first prompt, - at the next prompt, and 22 at the third prompt?

Display “Enter your age:”
Input age
While age <=0
Display “Impossible! Enter an age greater than 0:”
Input age
End While
Display “Thank you.”

A) Impossible! Enter an age greater than 0:
Impossible! Enter an age greater than 0:
Thank you.

B) Impossible! Enter an age greater than 0:
Impossible! Enter an age greater than 0:
Impossible! Enter an age greater than 0:

C) Thank you.

Answer 25

A) Impossible! Enter an age greater than 0:
Impossible! Enter an age greater than 0:
Thank you.

Question 26

What is wrong with the following pseudocode that validates a user’s entry?

Display “Do you want to play again? Enter y or n.”
While toLower(choice) != “y” AND toLower (choice) != “n”
Display “Please answer y or n. Play again?”
Input choice
End While

A) There is no check for uppercase Y or N
B) There is no priming read
C) The Boolean expression should be an OR, not AND

Answer 26

B) There is no priming read