ldexp, ldexpf, ldexpl - Calculate binary value

Definition	#include <math.h> double ldexp(double x, int exp); float ldexpf(floatx, int exp); (C11) long double ldexpl(long double x, int exp); (C11) Given its arguments x (mantissa) and exp (exponent), these functions calculate the number: x * 2exp ldexp is the inverse function of frexp.
Return val.	x * 2exp	if successful.
	+/-HUGE_VAL +/-HUGE_VALF +/-HUGE_VALL	depending on the function type and the sign of x, if an overflow occurs. In addition, errno is set to ERANGE (result too large).
Example	ldexp is the inverse function of frexp: frexp splits its floating-point argument into mantissa and exponent to the base 2, while ldexp uses these parts to calculate the original value in its internal floating-point representation. This is shown below for the number 5.342: #include <stdio.h> #include <math.h> int main(void) { double x; int ex; x = frexp(5.342, &ex); printf("Mantissa : %f\nexponent : %d\n", x, ex); printf("Initial value : %f\n", ldexp(x, ex)); return 0; }
See also	frexp, modf