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When to break?

The order in which you execute your code inside the loop and check when you should break is important. The following would run the code a different number of times.

# Code, then check condition
repeat {
    code
    if(condition) {
        break
    }
}

# Check condition, then code
repeat {
    if(condition) {
        break
    }
    code
}

Let's see this in an extension of the previous exercise. For the purposes of this example, the runif() function has been replaced with a static multiplier to remove randomness.

Cet exercice fait partie du cours

Intermediate R for Finance

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Instructions

  • The structure of a repeat loop has been created. Fill in the blanks so that the loop checks if the stock_price is below 66, and breaks if so. Run this, and note the number of times that the stock price was printed.
  • Move the statement print(stock_price) to after the if statement, but still inside the repeat loop. Run the script again, how many times was the stock_price printed now?

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Stock price
stock_price <- 67.55

___ {
  # New stock price
  stock_price <- stock_price * .995
  print(stock_price)
  
  # Check
  if(stock_price ___ ___) {
    print("Stock price is below 66! Buy it while it's cheap!")
    ___
  }

}
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