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There are 3 ways to store numbers: int, double and float.
int - only whole numbers
55 409834 45425346
float - up to 7 decimal places (32-bit)
0.1234567 1234.7654321 22.45
double - up to 15 decimal places (64 bit)
0.123456789123456 22.45 55.0
you do not have to use all the decimal places, it is just imporant to know what type of number will be used and then pick the type with the least amount of decimal places that will hold that number. Example: if you need 9 decimal places, pick double. If you need 6 decimal places, pick float. If you don't need any decimal places then use int.
Piplup Pochama16,851 Points
Unlike integers (type: Int) which are whole numbers without fractional values, i.e.
1 250 55234125134124
Doubles can be numbers with fractional values, such as
6.234253 8.8 83765438762.357
You can tell when a number is a Double when the number includes a decimal point (also known as a floating point).
Whole numbers can be represented as a Double by adding ".0" at the end:
1.0 250.0 55234125134124.0
Bonus fact: Doubles in Swift are numbers with at least 15 decimal place precision.
Jake Adams1,608 Points
From Apple's documentation:
"Floating-point numbers are numbers with a fractional component, such as 3.14159, 0.1, and -273.15."
Float is 32-bit floating point number and a
Double is a 64-bit floating point number.
Float has some accuracy issues, it's always considered best practice to use
Double when dealing with currency.