cbrt Function

Calculates the real cube root of a double precision floating-point value.

Include

<math.h>

Prototype

double cbrt(double x);

Argument

x
a non-negative floating-point value

Return Value

Returns the real cube root of x.

Example

See the notes at the beginning of this chapter or section for information on using printf() or scanf() (and other functions reading and writing the stdin or stdout streams) in the example code.

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

int main(void)
{
  double x, y;

  errno = 0;
  x = 0.0;
  y = cbrt(x);
  if (errno)
    perror("Error");
  printf("The cube root of %f is %f\n", x, y);

  errno = 0;
  x = 9.5;
  y = cbrt(x);
  if (errno)
    perror("Error");
  printf("The cube root of %f is %f\n", x, y);

  errno = 0;
  x = -25.0;
  y = cbrt(x);
  if (errno)
    perror("Error");
  printf("The cube root of %f is %f\n", x, y);
}

Example Output

The cube root of 0.000000 is 0.000000
The cube root of 9.500000 is 2.117912
The cube root of -25.000000 is -2.924018