SWIFT

swift double v float

Double is 64-bit // stores more precise decimal number
Float is 32-bit 

float vs double in swift

/* Float can only hold seven digits of decimal numbers
while Double can hold twice the number. */
// i.e:
let valueOfPi: Float = 3.142857143 
print(valueOfPi) // 3.142857

let valueOfRandomDecimal: Double = 7.1428571434322432345331
print(valueOfRandomNumber) // 7.142857143432243