union « struct « C Array Q&A

1. Access struct members as if they are a single array?    stackoverflow.com

I have two structures, with values that should compute a pondered average, like this simplified version:

typedef struct
{
  int v_move, v_read, v_suck, v_flush, v_nop, v_call;
} values;

typedef struct
{
  int qtt_move, qtt_read, ...

2. array orientation in structure    stackoverflow.com

For the union declaration below

union a
{
    int i;
    char ch[2];
};
union a u;
u.ch[0] = 3;
u.ch[1] = 2;

3. Casting of structs in union on char array    cboard.cprogramming.com