小编Veg*_*gas的帖子

我在玩弄 MutableLiveData 的方法来找出什么触发了观察者，什么没有。

现在，我有这个活动：

class ActivityA : AppCompatActivity() {
    private val liveData = MutableLiveData<Int>().apply { this.value = 10 }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        liveData.observe(this, Observer {
            Log.v("ActivityA", "liveData = $it")
        })
        Log.v("ActivityA", "liveData = ${liveData.value}")
        liveData.value = 11
        liveData.postValue(12)
        liveData.value = 13
    }
}

输出如下：

liveData = 10
liveData = 13
liveData = 12

不应该是这个吗？

liveData = 10
liveData = 11
liveData = 13
liveData = 12

#include <stdio.h>
#include <limits.h>

typedef struct item {
    int low; int high; char label[16];
} Item;

typedef struct item_coll {
    size_t length; Item *items[];
} ItemColl;

char *find_first_in_range(ItemColl *ic, int rlow, int rhigh) {
    for (size_t i = 0; i < ic->length; i++)
        if (ic->items[i]->low >= rlow && ic->items[i]->high <= rhigh)
            return &ic->items[i]->label[0];
    return NULL;
}

int main() {
    struct item fruits[] = {
        {10, 20, "Apple"},
        {12, 14, "Pear"},
        {8, 12, "Banana"},
        {2, 4, "Grape"},
        {15, 35, "Watermelon"}
    }; …

在此处调试此代码段时:

int main () {
   char str[] = "Stackoverflow";
   char a = *str;
   return 0;
}

为什么a显示为83 'S'？