如何以两位精度显示输出

num = 3.1415926
print("{:.2f}".format(num))

double num = 3.1415926;
System.out.printf("%.2f", num);

let num = 3.1415926;
console.log(num.toFixed(2));

#include<iostream>
#include <iomanip>

int main() {
    double num = 3.1415926;
    std::cout<< std::fixed<< std::setprecision(2)<< num<< std::endl;
    return 0;
}

$num = 3.1415926;
printf("%.2f", $num);