How to use setprecision in C++

by 
#include <iomanip>
#include <iostream>

int main()
{
    double num1 = 3.12345678;
    std::cout << std::fixed << std::showpoint;
    std::cout << std::setprecision(2);
    std::cout << num1 << std::endl;
    return 0;
}

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