# Swapping

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

The exchange functions allow two quaternions of the same type to exchange
component values.

Function for **BGC_FP32_Quaternion**:

```c
inline void bgc_fp32_quaternion_swap(BGC_FP32_Quaternion* const quarternion1, BGC_FP32_Quaternion* const quarternion2);
```

Function for **BGC_FP64_Quaternion**:

```c
inline void bgc_fp64_quaternion_swap(BGC_FP64_Quaternion* const quarternion1, BGC_FP64_Quaternion* const quarternion2);
```

The **quarternion1** and **quarternion2** parameters must be valid pointers.
The NULL (0) value is considered invalid.

The quaternion **quarternion1** after calling this function will have the same
component values the quaternion **quarternion2** had before calling
the function.

And the quaternion **quarternion2** after calling this function will have
the same compnent values the quaternion **quarternion1** had before calling
the function.

### Example

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

int main()
{
    BGC_FP32_Quaternion q1, q2;

    bgc_fp32_quaternion_set_values(&q1, 4, -2, 7, 5);
    bgc_fp32_quaternion_set_values(&q2, -5, 10, -1, -3);

    bgc_fp32_quaternion_swap(&q1, &q2);

    printf("Quaternion #1: s = %f, x = %f, y = %f, z = %f\n", q1.s, q1.x, q1.y, q1.z);
    printf("Quaternion #2: s = %f, x = %f, y = %f, z = %f\n", q2.s, q2.x, q2.y, q2.z);

    return 0;
}
```

The console output:

```
Quaternion #1: s = -5.000000, x = 10.000000, y = -1.000000, z = -3.000000
Quaternion #2: s = 4.000000, x = -2.000000, y = 7.000000, z = 5.000000
```

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