how to only print a set number of digits cpp cout code example

Example 1: how to specify how many decimal to print out with std::cout

#include <iostream>
#include <iomanip>

int main()
{
    double d = 122.345;
    std::cout << std::fixed << std::setprecision(2) << d;
}

//result that get print out: 122.34

Example 2: how to format decimal palces in c++

std::cout << std::setprecision(2) << std::fixed;
// where the 2 is how many decimal places you want
// note you need to <iomanip>