8.1.3 Selection (IF)

Question 1

What is selection?

Answer 1

Selection decides which statements or instructions are executed based on a condition e.g.

IF X > Y THEN
    OUTPUT X
ENDIF

OUTPUT X is only executed if the condition X > Y is true.

Question 2

Relational Operators

Answer 2

Description Pseudocode

Equal to | =
Less than | <
Greater than | >
Not equal to | <>
Less than or equal to | <=
Greater than or equal to | >=

Question 3

IF … THEN … ENDIF Conditional Statement

Answer 3

OUTPUT “What is 12 MOD 7? ”
INPUT answer

IF answer = “5“ THEN
OUTPUT “CORRECT”
ENDIF

Question 4

IF … THEN … ELSE … ENDIF Conditional Statement

Answer 4

OUTPUT “What is 12 MOD 7?”
INPUT answer

IF answer = “5“ THEN
OUTPUT “Correct”
ELSE
OUTPUT “Incorrect”
ENDIF

Question 5

IF … THEN … ELSE IF … THEN … ELSE … ENDIF Conditional Statement

Answer 5

INTEGER score ← 0
STRING grade ← “”

OUTPUT “Enter Score: ”
INPUT score

IF score < 50 THEN
grade ← “Fail”
ELSE IF score < 65 THEN
grade ← “Pass”
ELSE
grade ← “Merit”
ENDIF

Question 6

If Statements with Boolean Operators

Answer 6

IF a < b AND a < c THEN
OUTPUT “a is the smallest”
ENDIF

IF name == “John” OR name == “john” THEN
OUTPUT “Hi John”
ENDIF