iOS Swift - Swift Language Essentials
You want to declare a variable that can hold a decimal number and change later. Which declaration is correct?
You want to declare a variable that can hold a decimal number and change later. Which declaration is correct?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify variable mutability
Variable must be changeable, so usevar.Step 2: Choose correct type for decimal
Decimal numbers requireDoubleorFloat, butDoubleis preferred for precision.Step 3: Check value and type match
Value 9.99 matchesDoubletype.Final Answer:
var price: Double = 9.99 -> Option BQuick Check:
Mutable decimal variable = D [OK]
Quick Trick: Use var with Double for changeable decimals [OK]
Common Mistakes:
- Using let for changeable values
- Assigning decimal to Int type
- Using Float without reason
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