16进制BCD字节转int

int main()
{
    uint8_t a[] = {0x12, 0x34};
    char b[10];
    sprintf(b, "%02x%02x", a[0], a[1]);
    int c = atoi(b);
    printf("b=%s\n", b);
    printf("c=%d\n", c);

    return 0;
}