如何格式化具有指定精度级别的数字？

number = 3.1415926
formatted_number = round(number, 2)
print(formatted_number)  # 输出：3.14

let number = 3.1415926;
let formattedNumber = number.toFixed(2);
console.log(formattedNumber);  // 输出："3.14"

double number = 3.1415926;
DecimalFormat decimalFormat = new DecimalFormat("#.##");
String formattedNumber = decimalFormat.format(number);
System.out.println(formattedNumber);  // 输出："3.14"

double number = 3.1415926;
string formattedNumber = number.ToString("0.00");
Console.WriteLine(formattedNumber);  // 输出："3.14"