将浮点数限制为两个小数点

num = 3.1415926
rounded_num = round(num, 2)
print(rounded_num)  # 输出 3.14

let num = 3.1415926;
let rounded_num = num.toFixed(2);
console.log(rounded_num);  // 输出 "3.14"

double num = 3.1415926;
double rounded_num = Math.round(num * 100) / 100.0;
System.out.println(rounded_num);  // 输出 3.14

double num = 3.1415926;
double rounded_num = Math.Round(num, 2);
Console.WriteLine(rounded_num);  // 输出 3.14

$num = 3.1415926;
$rounded_num = round($num, 2);
echo $rounded_num;  // 输出 3.14