/C++/How to specify how many decimal to print out with std::cout

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

Source: stackoverflow.com

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