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Computer Science IGCSEPDF 102
142 pagesrevision 46930
PDF 102
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8.1.2 Selection Statements
8.1.2 Input and Output
Nested
statement
When there is an else clause
Input
Output
INPUT <identifier>
OUTPUT <identifier>
Sequence:
● It is the order in which the statements in a program are executed.
● A logical sequence is necessary for the program to function correctly.
● If statements may or may not contain an ELSE clause.
● The else clause only functions when the condition for the if statement is false.
● Nested if statements are used to handle hierarchical decision making.
When there is no else clause
Input:
It is the value given to the computer by the user.
Output:
The information a computer displays, stores or transmits to another computer.
IF
IF <condition> THEN
<statement(s)>
ENDIF
IF <condition> THEN
<statement(s)>
ELSE
<statement(s)>
ENDIF
IF <condition> THEN
<statements>
ELSE
IF <condition> THEN
<statements>
ELSE
<statements>
ENDIF
ENDIF
IF statements: