union bit7int
{
    struct
    {
        int iv : 7;
        :1;
    };
    uint8_t bv;
} ;

uint8_t get7bitsInteger(int x)
{
    struct bit7int b7i = {.bv = 0};

    b7i.iv = x / (1U << (sizeof(int) - 7));
    return b7i.bv;
}