Unit 2.2 Programming Techniques MCQs L2

The following is true about Top-down approach

• The Main procedure is defined first, with other subs to follow

• The detailed list of all operations is drawn up first, before we can start planning

• We start from the top of the program and complete the algorithm by getting to the

  bottom of it

• Functions can’t be included as they can’t be directly called by procedures.

Structured code has the following benefit

• Reduces the number of lines of code

• Improves efficiency

• Makes code easier to read and debug

• All of these options are true

Variable scope refers to

• Variable data type

• Variable identifier

• Logic errors associated with a variable

• Different use of global and local variables

The advantages of parameter passing don’t include this

• The same subprogram can be reused in more cases

• Parameter passing makes it easier to use global variables

• More flexible coding

• Can cut down on the use of wasteful global variables

The main difference between procedures and functions is

• Procedures are usually longer and have more instructions

• Functions use parameter passing, while procedures don’t

• Functions are more difficult to debug

• Functions return values, while procedures don’t

When a variable first appears outside any subprograms

• It is a global variable

• It is a local variable

• It is a parameter variable

• It is not a valid variable

Converting procedures to functions usually causes these effects

• Shorter code

• Slows the program down

• Reduction of the number of global variables, more parameter passing

• Makes it more difficult to use selection

From this statement: a:=getChoice() we can see that

• getChoice() is a function

• getChoice() is a global variable

• a is an array

• getChoice() is a procedure

Trying to use a local variable from outside its scope will cause

• A global variable to be overwritten by it

• A wrong procedure to run

• A crash with a report “Unknown variable”

• A logical error

Identify a correct statement:

• Global variables waste memory

• showResults(choice,cutoff) is a function

• An array index is its length

• Nested iteration structures can share the same counter variable