frexp, frexpf, frexpl - Split floating-point number into mantissa and exponent

Definition	#include <math.h> double frexp(double value, int *e_p); float frexpf(float value, int *e_p); (C11) long double frexpl(long double value, int *e_p); (C11) The functions split a floating-point number value into the mantissa x and the exponent n on thebasis of the formula: value = x * 2n
	|x| n	is in the interval [0.5, 1.0[ is an integer
	The result from these functions is the mantissa x and an integer value for the exponent n. The exponent is returned indirectly via a result parameter e_p. frexp is the inverse function of ldexp.
Return val.	Mantissa x		a floating-point number of type double which satisfies the equation value = x * 2n and lies in the interval [0.5, 1.0[.
	0		if value is equal to 0 (the exponent is also equal to 0 in this case).
Note	Note that the argument e_p must be a pointer!
Example	Normalized representation of the number 5 to base 2: #include <stdio.h> #include <math.h> int main(void) { double z; int exp; z = frexp((double)5, &exp); printf("5 = %g * 2 ** %d\n", z, exp); return 0; }
See also	ldexp, modf