← IGCSE Computer Science Paper 1

Digital wallets

Software or an app on a phone or computer that stores a person's digital currency and is used to send and receive it. Losing access to it can mean losing the currency.

Part of: IGCSE Computer Science 0478 — 5.2 Digital Currency — Module 6

Understanding Digital wallets in IGCSE Computer Science Paper 1

What it does: This code creates a wallet app stored on a phone, showing that wallets are software on a device. The receive command shows the wallet accepting digital currency from another person. A digital wallet is an app or program, so it runs on devices such as phones and computers. Losing access to a wallet can mean losing the currency, because nobody can give the access back automatically. A digital wallet is used to send payments to other people.

Common mistakes: To check how much currency the wallet holds you read its balance with wallet.GetBalance(). Send() is used to pay someone, not to read the balance. Receiving a payment adds currency to the wallet, so the line should be balance ← balance + 10. Subtracting is what happens when you send.

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This module's key terms are also in a printable crossword (Modules 500–509) and word search (Modules 490–509).

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Learning
Duo
What is a digital wallet?
A leather case that holds coins and notesAn app or software that stores your digital currency and is used to send and receive it
Matches
wallet = "physical leather purse"
↓
A digital wallet is software or an app, not a physical purse that holds coins and notes
Applying
Meanings
Term
digital wallet
Meaning
Software or an app on a phone or computer that stores a person's digital currency and is used to send and receive it. Losing access to it can mean losing the currency.
Practice
DECLARE walletBalance : INTEGER
Testing
Gaps
(wallet, "Sam", 5)
Check Answer
Spots
1wallet ← OpenWallet("Sam")
2balance ← wallet.Send()

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Quick Questions

1. What is a digital wallet?
A. An app or software that stores your digital currency and is used to send and receive it ✓
B. A leather case that holds coins and notes
A digital wallet is software on a phone or computer. It is not a physical object holding cash.
2. Where can a digital wallet be stored?
A. On a phone or a computer ✓
B. Only inside a bank vault
A digital wallet is an app or program, so it runs on devices such as phones and computers.
3. Which action can you do with a digital wallet?
A. Print new coins and notes
B. Send and receive digital currency payments ✓
Wallets are used to send and receive digital currency. They do not create physical money.
4. What does a digital wallet hold that lets you use your currency?
A. A paper copy of every transaction in the world
B. The access details to your digital currency ✓
The wallet holds the access you need to your currency, so you can send and receive it.
5. A student loses their phone and has no way into their wallet. What could happen?
A. They could lose their digital currency ✓
B. Their currency is always safely returned automatically
Losing access to a wallet can mean losing the currency, because nobody can give the access back automatically.

Match the Pairs

wallet.send("Sam", 0.5) → Sends 0.5 units of digital currency from the wallet to another person
balance = wallet.getBalance() → Checks how much digital currency the wallet gives access to
A digital wallet is an app on a phone or computer that stores a person's digital currency → wallet = WalletApp("phone")
A wallet is used to receive payments as well as send them → wallet.receive("Ana", 2)
wallet = "physical leather purse" → A digital wallet is software or an app, not a physical purse that holds coins and notes
lostPhone -> currency is always safe → Losing access to a wallet can mean losing the digital currency stored in it

Key Term

digital wallet
Software or an app on a phone or computer that stores a person's digital currency and is used to send and receive it. Losing access to it can mean losing the currency.

Fill in the Blanks

1. SEND(wallet, "Sam", 5)
Hint: Type the command that pays currency out of the wallet to another person.
2. balance ← balance + payment
Hint: Type the operator that makes the wallet balance go up when currency is received.
3. IF balance >= amount THEN SEND(wallet, "Sam", amount) ENDIF
Hint: Type the comparison operator that checks the wallet holds enough currency to cover the payment.
4. IF phoneLost THEN access ← FALSE
Hint: Type the Boolean value showing the owner can no longer reach their wallet.
5. wallet ← OPEN(privateKey)
Hint: Type the command that unlocks the wallet using the secret access code.

Spot the Error

Question 1
A wallet ← OpenWallet("Sam")
B balance ← wallet.Send()
C OUTPUT "Balance: ", balance
Line B — To check how much currency the wallet holds you read its balance with wallet.GetBalance(). Send() is used to pay someone, not to read the balance.
Question 2
A balance ← 50
B balance ← balance - 10
C OUTPUT balance
Line B — Receiving a payment adds currency to the wallet, so the line should be balance ← balance + 10. Subtracting is what happens when you send.
Question 3
A friend ← "address_77X"
B amount ← 5
C wallet.Receive(friend, amount)
Line C — The program is paying a friend, so it must use wallet.Send(friend, amount). Receive is used when money arrives in your wallet.
Question 4
A OUTPUT "Enter your password"
B INPUT password
C IF password <> wallet.key THEN
D wallet.Open()
E ENDIF
Line C — The wallet should only open when the password matches the key. Using <> would let in people who enter the wrong password, so it should be =.
Question 5
A backup ← wallet.key
B phone ← "lost"
C wallet.Restore(phone)
Line C — A wallet is restored on a new device using the saved backup key. The lost phone cannot be used, so it should be wallet.Restore(backup).

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