exp2f Function

Calculates the base 2 exponential function of x (2 raised to the power x, where x is a single precision floating-point value).

Include

<math.h>

Prototype

float exp2f(float x);

Argument

x

value for which to return the exponential

Return Value

Returns the base 2 exponential of x. On an overflow, exp returns inf and on an underflow exp returns 0.

Remarks

A range error occurs if the magnitude of x is too large.

Example

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

int main(void)
{
  float x, y;

  errno = 0;
  x = 1.0;
  y = exp2f(x);
  if (errno)
    perror("Error");
  printf("The base 2 exponential of %f is %f\n", x, y);

  errno = 0;
  x = 10;
  y = exp2f(x);
  if (errno)
    perror("Error");
  printf("The base 2 exponential of %f is %f\n", x, y);

  errno = 0;
  x = -10;
  y = exp2f(x);
  if (errno)
    perror("Error");
  printf("The base 2 exponential of %f is %f\n", x, y);
}

Example Output

The base 2 exponential of 1.000000 is 2.000000
The base 2 exponential of 10.000000 is 1024.000000
The base 2 exponential of -10.000000 is 0.000977