IGCSE Computer Science Paper 2 Word Scramble: 8.1c Procedures and Functions (Modules 409–418)
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Word scramble
Unscramble the letters and write each key term on the line.
1
LLAC LMA1(UEEVNA, AEVUL2)
Each value in a call must match its parameter in number, order and data type, so a STRING cannot go to an INTEGER parameter and values cannot be swapped or left out.
2
EDNFEI NHET LCLA
Write procedures and functions at the start of the code, before the main program. The main program comes after and holds the CALL statements and function calls that use them.
3
ENTURR
______ followed by a value or expression sends that value back to where the function was called, e.g. ______ Number1 * Number1. It also ends the function.
4
TSERURN
Keyword in a function header, followed by a data type such as INTEGER, REAL, STRING or BOOLEAN. The value sent back by RETURN must be of that same type.
5
1SAQ0RMSE(UU, 02) + 1
A function call is written inside an expression, with no CALL keyword. The returned value replaces the call, then the rest of the expression is worked out.
6
PTTOUU MUAUSQ1RS(E0, 02)
Puts a function call inside OUTPUT. The function runs first, then the value it RETURNs is displayed. Text can be added: OUTPUT "Sum = ", SumSquare(10, 20).
7
ATLOT ← EUSRQ3SUM(A, 4)
The function runs, and the value it returns is stored in the variable on the left of the arrow. You can use that variable later. Its type must match the function's return type.
8
FI ERSNEV(EIUBNM) NHET
A function that RETURNS a BOOLEAN can be called straight in an IF or WHILE condition. The call gives TRUE or FALSE, so no comparison is needed.
Answer Key
IGCSE Computer Science Paper 2 · Modules 409–418
1LLAC LMA1(UEEVNA, AEVUL2) → CALL Name(value1, value2) — Each value in a call must match its parameter in number, order and data type, so a STRING cannot go to an INTEGER parameter and values cannot be swapped or left out.
2EDNFEI NHET LCLA → Define then call — Write procedures and functions at the start of the code, before the main program. The main program comes after and holds the CALL statements and function calls that use them.
3ENTURR → RETURN — RETURN followed by a value or expression sends that value back to where the function was called, e.g. RETURN Number1 * Number1. It also ends the function.
4TSERURN → RETURNS — Keyword in a function header, followed by a data type such as INTEGER, REAL, STRING or BOOLEAN. The value sent back by RETURN must be of that same type.
51SAQ0RMSE(UU, 02) + 1 → SumSquare(10, 20) + 1 — A function call is written inside an expression, with no CALL keyword. The returned value replaces the call, then the rest of the expression is worked out.
6PTTOUU MUAUSQ1RS(E0, 02) → OUTPUT SumSquare(10, 20) — Puts a function call inside OUTPUT. The function runs first, then the value it RETURNs is displayed. Text can be added: OUTPUT "Sum = ", SumSquare(10, 20).
7ATLOT ← EUSRQ3SUM(A, 4) → Total ← SumSquare(3, 4) — The function runs, and the value it returns is stored in the variable on the left of the arrow. You can use that variable later. Its type must match the function's return type.
8FI ERSNEV(EIUBNM) NHET → IF IsEven(Number) THEN — A function that RETURNS a BOOLEAN can be called straight in an IF or WHILE condition. The call gives TRUE or FALSE, so no comparison is needed.