SDD HSC Quiz 5A Q1-10

A metalanguage is

• either an EBNF or railroad diagram.
• used to make sense of programming languages.
• another name for a high-level language.
• used to describe the syntax of another language.

In EBNF {<thing>} means that <thing>:

• is repeated one or more times.
• is repeated zero or more times.
• is optional.
• can take on more than one value.

Which of the following is true of multidimensional arrays?

• Data is stored in records.
• Each data item takes the same value.
• All data items are of the same data type.
• No two data items can have the same value.

Declaring a user defined variable involves:

• Defining the data type then declaring the variable.
• Declaring the variable then defining the data type.
• Determining the number of indexes then declaring the variable.
• Opening the data type and then reading its contents.

If RND generates a random number in the range 0 to less than 1. INT(RND*6)+4 would result in integers in the range:

• 4 to 10.
• 6 to 10.
• 4 to 9.
• 3 to 9.

A multi-dimensional array requires 3 indexes and needs to store 1000 data items. Which Visual Basic statement achieves this task?

• DIM Test(10,10,10)
• DIM Test(9,9,9)
• DIM Test(999,999,999)
• DIM Test(400,300,300)

A data structure containing a series of records could be:

• an array of records.
• a file.
• a multi-dimensional array.
• Both A and B.

If a digit is defined in EBNF to be 1|2|3|4|5. A syntactically correct HiNum is:

• HELLO/1/2/1/BYE

• HELLO1232/BYE

• HELLO1/2/3/4BYE

• HELLO1/2/3/BYE

A data structure is declared in Pascal using the following statements. Which of the following is correct?

• An array of records exists called ThisThat. It contains six data items.

• Each record of type ThisThat will contain six data items.

• A variable declared with type ThisThat will be an array with 3 records.

• A variable of type ThisThat will contain two records. Each record containing three fields.

What is the purpose of the following fragment of Visual Basic code:

• A loop counts from 1 to 1000. 1000 random numbers are totalled. Each number is either a 0 or a 1.

• The number of 0s and the number of 1s generated is calculated for 1000 random numbers. Each random number can be either a 0 or a 1.

• One thousand 0s and 1s are generated. The total of all the 0s is stored in Total(0) and the total of all the 1s in Total(1).

• 1000 random numbers from 0 to 1 are generated. Each number is added to the total after it is generated.