TERM 1 | Practical | Chapter 4

Question 1

What is the difference between DIV and MOD?

Answer 1

Div Divides the first number by the second, then discards the remainder
Mod Divides the first number by the second, then keeps only the remainder

Question 2

What is the result?

9 MOD 5

Answer 2

4

Question 3

When we evaluate basic mathematical operators in mathematical expressions,
they need to be evaluated using the ____rule

Answer 3

BODMAS

Question 4

Operators with the same importance are executed from___to___, in the order in which they appear.

Answer 4

Left

Right

Question 5

Evaluate the expression below:

2 + 3 *26 / (16 – 3) – 5

Answer 5

= 2 + 3 * 26 / 13 – 5 (Level 1 – brackets)
= 2 + 78 / 13 – 5 (Level 2 – multiplication)
= 2 + 6 – 5 (Level 2 –division)
= 8 – 5 (Level 3 – addition)
= 3 (Level 3 – subtraction)

Question 6

What is a trace table?

Answer 6

A trace table is a tool used to track how the value of variables change in a program
after each line of code is executed. This tool is helpful for testing an algorithm
because it helps you to determine if an algorithm gives the correct result.

Question 7

What do you need to create a trace table

Answer 7

● identify all the variables
● create a table with a column for each line number, a separate column for
each variable, and a column for the output
● follow the code line-by-line and write down the new value of the variable that
changed.

Question 8

What is an IPO Table?

Answer 8

An Input-Processing-Output (IPO) table is a planning tool that can be used to record your inputs,
processing and output. Usually, before you write a program,

Question 9

In Delphi, you can format real numbers to display in a speci c format. In this unit we will use the\_\_\_\_\_
function to format real numbers.

Answer 9

FloatToStrF

Question 10

What does Precision refers to?

Answer 10

Precision refers to the total number of digits a number will display. If the number of digits in the Value
exceeds the total number of digits in the Precision, then the Value is rounded to the total number of
digits as per the Precision

Question 11

What is a format and give 2 examples

Answer 11

Format indicates how a Value will be formatted into a string. The formats that we will use this
year are:

ffCurrency
ffFixed

Question 12

What would be the value of this number?
rVal:=452.769;
lblOut.Caption:=FloatToStrF(rVal,ffFixed,8,1);

Answer 12

452.8

Question 13

What would be the output of this function

rSquare := Sqr(4); //

Answer 13

rSquare = 16

Question 14

what does the SQRT FUNCTION calculate?

Answer 14

The SQRT function calculates the square root of a number.

Question 15

What does the Round function calculate

Answer 15

The ROUND function is used to round a real number to the nearest integer
number.

Question 16

What does the TRUNC FUNCTION calculate

Answer 16

The TRUNC function truncates (removes or ‘chops off’) the decimal part of a real
number. It returns an integer after the truncation.

Question 17

What does the Random function calculate?

Answer 17

The RANDOM function is used to generate random numbers.

Question 18

If a variable needs to be accessed from more than one event handler, it must be
declared outside of the event handlers in the___section at the top of the
program. We say that these variables have global scope.

Answer 18

VAR