如何仅在需要时打印带有两个小数的双精度

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

number = 3.1415926
formattedNumber = "{:.2f}".format(number)
print(formattedNumber)  # 输出结果为 "3.14"

import java.text.DecimalFormat;

public class Main {
    public static void main(String[] args) {
        double number = 3.1415926;
        DecimalFormat decimalFormat = new DecimalFormat("#.00");
        String formattedNumber = decimalFormat.format(number);
        System.out.println(formattedNumber);  // 输出结果为 "3.14"
    }
}

double number = 3.1415926;
string formattedNumber = String.Format("{0:.00}", number);
Console.WriteLine(formattedNumber);  // 输出结果为 "3.14"