Gets the mantissa and exponent of a double value.

#include <math.h>

double frexp (double x, int *expptr);

Parameters

x

Value to find exponent for.

expptr

Pointer to stored integer exponent n.

Remarks

Breaks down the value x into a mantissa m and an exponent n, such that the absolute value of m is greater than or equal to 0.5 and less than 1.0, and x = m * 2n.

Return Values

• The mantissa value.
• 0 for both the mantissa and the exponent if x is 0.

Requirements

See Also

ldexp, modf