INPUT and data types · ⁨INPUT과 데이터 타입⁩

INPUT reads what the user types

• INPUT reads one line the user types and stores it in a variable.
• Pair it with OUTPUT to talk to the user.

INPUT Name
OUTPUT "Hello, ", Name

DECLARE the type so numbers work

• Text typed in is a string by default.
• DECLARE a variable as INTEGER (or REAL) so INPUT reads a number.

DECLARE Age : INTEGER
INPUT Age
OUTPUT Age + 1

The five data types

• Every value has a type. The 2026–2028 syllabus uses five: INTEGER, REAL, CHAR, STRING and BOOLEAN.

DECLARE Price : REAL
DECLARE Letter : CHAR
DECLARE Passed : BOOLEAN
Price ← 2.50
Letter ← 'A'
Passed ← TRUE
OUTPUT Price, " ", Letter, " ", Passed

Watch out

• Without DECLARE ... : INTEGER, INPUT keeps the value as a string, so Age + 1 would fail.
• CHAR holds one character in single quotes ('A'); STRING holds many in double quotes.

Common mistakes

• INPUT x reads a value into x.
• Choose the right type: INTEGER, REAL, STRING, BOOLEAN or CHAR.

Now you try

• Each task reads one input with INPUT.
• Press Check answer to test it.