← IGCSE Computer Science Paper 2

Defining a procedure with one parameter

Defines a procedure with one parameter. In the brackets after the name, write the parameter identifier, a colon, then its data type. Size is used inside the body.

Part of: IGCSE Computer Science 0478 — 8.1c Procedures and Functions — Module 11

Understanding Defining a procedure with one parameter in IGCSE Computer Science Paper 2

What it does: Inside the body between PROCEDURE and ENDPROCEDURE, the parameter name Size is used like a variable to output its value. The parameter identifier comes first, then a colon, then the data type: Size : INTEGER. A procedure starts with PROCEDURE and finishes with ENDPROCEDURE. ENDFUNCTION is for functions.

Common mistakes: The parameter is called Size, so the loop must use Size. Length is not defined anywhere. It should be FOR Count ← 1 TO Size. A procedure must finish with ENDPROCEDURE. ENDFUNCTION is used to close a function.

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Learning

Duo

Which header correctly defines a procedure with one parameter called Size?

PROCEDURE Line(Size : INTEGER)PROCEDURE Line(INTEGER : Size)

Matches

PROCEDURE Line(Size INTEGER)

↓

The colon is missing between the parameter name and its data type. It should be Size : INTEGER.

Applying

Meanings

Term

PROCEDURE Line(Size : INTEGER)

Meaning

Defines a procedure with one parameter. In the brackets after the name, write the parameter identifier, a colon, then its data type. Size is used inside the body.

Practice

PROCEDURE Line(Size : INTEGER)

Testing

Gaps

PROCEDURE Line(Size : )

Check Answer

Spots

1PROCEDURE Line(Size : INTEGER)

2 FOR Count ← 1 TO Length

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Quick Questions

1. Which header correctly defines a procedure with one parameter called Size?

A. PROCEDURE Line(Size : INTEGER) ✓

B. PROCEDURE Line(INTEGER : Size)

The parameter identifier comes first, then a colon, then the data type: Size : INTEGER.

2. Which procedure header is written correctly?

A. PROCEDURE Greet(Name : STRING) ✓

B. PROCEDURE Greet(Name STRING)

The identifier and the data type must be separated by a colon. Without it the header is wrong.

3. Where is the parameter written when you define a procedure?

A. On the line after ENDPROCEDURE

B. In brackets straight after the procedure name ✓

The parameter goes in the brackets in the header, for example PROCEDURE Line(Size : INTEGER).

4. Which keyword ends the definition of a procedure?

A. ENDPROCEDURE ✓

B. ENDFUNCTION

A procedure starts with PROCEDURE and finishes with ENDPROCEDURE. ENDFUNCTION is for functions.

5. A procedure is defined as PROCEDURE Greet(Name : STRING). Which line inside the body outputs the value that was passed in?

A. OUTPUT "Hello Name"

B. OUTPUT "Hello ", Name ✓

Name without quotes uses the parameter's value. Inside quotes, Name is just the letters N-a-m-e.

Match the Pairs

PROCEDURE Line(Size : INTEGER) → Starts a procedure called Line with one parameter, Size, which must hold a whole number

PROCEDURE ShowName(Name : STRING) → Starts a procedure with one parameter, Name, that holds text

A parameter is used inside the procedure body like a variable, for example to output its value → OUTPUT Size

A procedure with a REAL parameter ends with ENDPROCEDURE after its body → PROCEDURE ShowPrice(Price : REAL) OUTPUT Price ENDPROCEDURE

PROCEDURE Line(Size INTEGER) → The colon is missing between the parameter name and its data type. It should be Size : INTEGER.

PROCEDURE Line(INTEGER : Size) → The identifier and data type are the wrong way round. The identifier comes first, then the colon, then the type: Size : INTEGER.

Key Term

PROCEDURE Line(Size : INTEGER)

Defines a procedure with one parameter. In the brackets after the name, write the parameter identifier, a colon, then its data type. Size is used inside the body.

Fill in the Blanks

1. PROCEDURE Line(Size : INTEGER) OUTPUT Size ENDPROCEDURE

Hint: Type the data type used for whole numbers.

2. PROCEDURE Greet(Name : STRING) OUTPUT "Hello ", Name ENDPROCEDURE

Hint: Type the keyword that starts a procedure definition.

3. PROCEDURE ShowPrice(Cost : REAL) OUTPUT Cost ENDPROCEDURE

Hint: Type the keyword that closes the procedure.

4. PROCEDURE Line(Size : INTEGER) OUTPUT Size ENDPROCEDURE

Hint: Type the parameter identifier so the body uses the value passed in.

5. PROCEDURE Greet(Name : STRING) OUTPUT Name ENDPROCEDURE

Hint: Type the symbol that separates the parameter identifier from its data type.

Spot the Error

Question 1

A PROCEDURE Line(Size : INTEGER)

B FOR Count ← 1 TO Length

C OUTPUT "*"

D NEXT Count

E ENDPROCEDURE

Line B — The parameter is called Size, so the loop must use Size. Length is not defined anywhere. It should be FOR Count ← 1 TO Size.

Question 2

A PROCEDURE Greet(Name : STRING)

B OUTPUT "Hello "

C OUTPUT Name

D ENDFUNCTION

Line D — A procedure must finish with ENDPROCEDURE. ENDFUNCTION is used to close a function.

Question 3

A PROCEDURE ShowTotal(Cost, REAL)

B OUTPUT "Total: ", Cost

C ENDPROCEDURE

Line A — A parameter is written as identifier, colon, data type. The comma should be a colon: ShowTotal(Cost : REAL).

Question 4

A PROCEDURE Box(Side : INTEGER)

B DECLARE Area : INTEGER

C Area ← Side * Side

D OUTPUT Size

E ENDPROCEDURE

Line D — The parameter is named Side, so Size does not exist in this procedure. The line should output the calculated value: OUTPUT Area.

Question 5

A PROCEDURE Stars(Num : INTEGER)

B FOR Count ← 1 TO Num

C OUTPUT "*

D NEXT Count

E ENDPROCEDURE

Line C — The string is missing its closing quotation mark. It should be OUTPUT "*".

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