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ALGORITHM IN REAL-LIFE

As you now understand what algorithms are, you might be surprised to know how
many algorithms you encounter every single day.

Here are a few examples of algorithm in real-life:

Example 1: ATM Machine

When you use an Automatic Teller Machine (ATM) to withdraw money, the ATM

follows a specific algorithm to verify your identity and check that you have enough
money in your account. Here is the simplified algorithm an ATM follows:

Step 1 User inserts debit card.

Step 2 ATM asks for PIN (secret number).

Step 3 Is PIN correct?

If NO: Show error and eject card.

If YES: Continue.

Step 4 User selects amount to withdraw.
Step 5 Is enough money in account?

If NO: Show error.

If YES: Dispense cash.

Step 6 Print receipt and eject card.

Example 2: Search Engine

When you search something on a search engine

like Google, it uses a smart set of steps to find useful
information for you. It looks at your search words,
related popular pages and past searches. It gives you

results in just a second.

Example 3: Traffic Lights

Traffic lights also follow an algorithm. They systematically
change from red to yellow to green in a fixed order and stay on

for a certain time. Even in busy cities, more advanced algorithms

Algorithmic Thinking 47