Question

How to generate NaN float value in C++

Answer 1

#include <iostream>
#include <cmath>

int main()
{
    float f;
    
    f = nanf("");
    
    std::cout << f;
}




/*
run:

nan

*/

 

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Answer 2

#include <iostream>
#include <cmath>

int main()
{
    float f = NAN;
    
    std::cout << f;
}




/*
run:

nan

*/

 

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