📅  最后修改于: 2022-03-11 15:00:00.991000             🧑  作者: Mango
//Multiply the double you want to round by 10^(the number of decimal place precision you want), use the "round()" function, then divide by that number again
let x = 1.23556789
let y = Double(round(1000*x)/1000)
print(y) // 1.236