C++ Programming/Code/Standard C Library/Functions/frexp

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#include <cmath>
double frexp( double num, int* exp );

The function frexp() is used to decompose num into two parts: a mantissa between 0.5 and 1 (returned by the function) and an exponent returned as exp. Scientific notation works like this:

num = mantissa * (2 ^ exp)
Related topics
ldexp - modf