Question

How to get the fraction and exponent of a real number in C++

Answer 1

#include <iostream>
#include <cmath>

int main() {
    double d = 3.14;
    int exponent;

    // Mantissa is the fractional part of a number = 0.785000
    
    double fraction = std::frexp(d, &exponent);
    
    std::cout << "fraction = " << fraction << " exponent = " << exponent << std::endl;
}



/*
run:

fraction = 0.785 exponent = 2

*/

 

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