scalbnl Function

Calculates the signed exponent of a double precision floating-point value.

Include

<math.h>

Prototype

long double scalbnl(long double x, int n);

Argument

x

multiplier

n

the power to which FLT_RADIX is raised

Return Value

Efficiently calculates and returns the value of x times FLT_RADIXn.

Remarks

A range error might occur.

Example

#include <math.h>
#include <stdio.h>
#include <errno.h>

int main(void)
{
  long double x, y;
  int power;

  errno = 0;
  x = 13.45;
  power = 8;
  y = scalbnl(x, power);
  if (errno)
    perror("Error");
  printf("FLT_RADIX raised to the power %d, times %Lf is %Lf\n", power, x, y);
}

Example Output

FLT_RADIX raised to the power 8, times 13.450000 is 3443.200000