union c

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

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

    typedef struct s1 {
        float fV1;
        float fV2;
    } s1;

    typedef struct s2 {
        float fV1;
        char cV2;
    } s2;

    typedef union u1 {
        s1 m1;
        s2 m2;
    } u1;

    union u1 nu1 = {{0.1f,0.2f}};

    printf("nu1 (0): %f\n",nu1.m1.fV1);
    printf("nu1 (1): %f\n\n",nu1.m1.fV2);

    //designated union initializer
    union u1 nu2 = {.m2.fV1 = 0.3f, .m2.cV2='C'};

    printf("nu2 (0): %f\n",nu2.m2.fV1);
    printf("nu2 (1): %c\n\n",nu2.m2.cV2);

    union u1 nu3;

    nu3.m2.fV1 = 0.5f;
    nu3.m2.cV2 = 'c';

    printf("nu3 (0): %f\n",nu3.m2.fV1);
    printf("nu3 (1): %c\n\n",nu3.m2.cV2);



return 0;
}