# Copying of component values

[Русская версия / Russian version](copy-rus.md)

## Function options

```c
inline void bgc_fp32_quaternion_copy(BGC_FP32_Quaternion* const destination, const BGC_FP32_Quaternion* const source);

inline void bgc_fp64_quaternion_copy(BGC_FP64_Quaternion* const destination, const BGC_FP64_Quaternion* const source);
```

These functions allow to copy the component values of one quaternion to another quaternion.

Each of these functions is equivalent to the following lines of code:

```c
destination->s = source->s;
destination->x = source->x;
destination->y = source->y;
destination->z = source->z;
```

## Parameters

|  Parameter  | Direction  | Description                                                                      |
| ----------- | ---------- | -------------------------------------------------------------------------------- |
| destination |     out    | A pointer to a quaternion to set component values from *source*                  |
|   source    |     in     | A pointer to a quaternion which component values will be copied to *destination* |

The *source* and *destination* parameters must be valid pointers. The NULL (0) value is also considered invalid.

## Example

```c
#include <stdio.h>
#include <basic-geometry.h>

int main()
{
    BGC_FP32_Quaternion q1, q2;

    q1.s = 1.1f;
    q1.x = -2.0f;
    q1.y = 7.4f;
    q1.z = 1.8f;

    bgc_fp32_quaternion_copy(&q2, &q1);

    printf("s = %f, x = %f, y = %f, z = %f\n", q2.s, q2.x, q2.y, q2.z);

    return 0;
}
```

[Documentation](../intro-eng.md) / [Quaternions](../quaternion-eng.md)