union c

//-std=c99
#include <stdio.h>
#include <stdlib.h>

#include <stdint.h>

int main (int argc, char **argv)
{

//from VulkanSDK
typedef union VkClearColorValue {
    float       float32[4];
    int32_t     int32[4];
    uint32_t    uint32[4];
} VkClearColorValue;

typedef struct VkClearDepthStencilValue {
    float       depth;
    uint32_t    stencil;
} VkClearDepthStencilValue;

typedef union VkClearValue {
    VkClearColorValue           color;
    VkClearDepthStencilValue    depthStencil;
} VkClearValue;



    VkClearValue test1;
    VkClearValue test2;

    VkClearColorValue vcv;
    VkClearDepthStencilValue cdsv;

    vcv.float32[0]=0.1f;
    vcv.float32[1]=0.2f;
    vcv.float32[2]=0.3f;
    vcv.float32[3]=0.4f;

    printf("vcv (0): %f\n",vcv.float32[0]);
    printf("vcv (1): %f\n",vcv.float32[1]);
    printf("vcv (2): %f\n",vcv.float32[2]);
    printf("vcv (3): %f\n\n",vcv.float32[3]);

    cdsv.depth=0.5f;
    cdsv.stencil=1;

    printf("cdsv (0): %f\n",cdsv.depth);
    printf("cdsv (1): %d\n\n",cdsv.stencil);


    test1.color = vcv;

    test2.depthStencil = cdsv;


    printf("test1 (0): %f\n",test1.color.float32[0]);
    printf("test1 (1): %f\n",test1.color.float32[1]);
    printf("test1 (2): %f\n",test1.color.float32[2]);
    printf("test1 (3): %f\n\n",test1.color.float32[3]);

    printf("test2 (0): %f\n",test2.depthStencil.depth);
    printf("test2 (1): %d\n",test2.depthStencil.stencil);

    //wrong code
    //test1.color = vcv;
    //test1.depthStencil = cdsv;

return 0;
}