一次使用多个联合体成员

#include <stdio.h>

int main( void ){
    union flag {
        char   c;
        int    i;
        long   l;
        float  f;
        double d;
    } shared;

    shared.c = '$';

    printf(\nchar c   = %c,  shared.c);
    printf(\nint i    = %d,  shared.i);
    printf(\nlong l   = %ld, shared.l);
    printf(\nfloat f  = %f,  shared.f);
    printf(\ndouble d = %f,  shared.d);

    shared.d = 123456789.8765;

    printf(\n\nchar c   = %c,  shared.c);
    printf(\nint i    = %d,  shared.i);
    printf(\nlong l   = %ld, shared.l);
    printf(\nfloat f  = %f,  shared.f);
    printf(\ndouble d = %f\n,  shared.d);

    return 0;
}