Question

How to round in scientific notation with C++

Answer 1

#include <iostream>
#include <iomanip>
#include <cfenv>

int main()
{
    std::cout << std::setprecision(0) << std::scientific;

    std::fesetround(FE_DOWNWARD);
    std::cout << "round down: " << 0.52 << "\n";       

    std::fesetround(FE_UPWARD);
    std::cout << "round up: " << 0.52;           
}




/*
run:

round down: 5e-01
round up: 6e-01

*/

 

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