c++ - 将 bool 数组转换为 int32、unsigned int 和 double？

Question

我有大小为 32、48、64 的 bool 数组(每个 bool 值代表一个位)。如何将它们转换为具有良好性能的数字(int、unsigned int、double48、double64)？例如:

bool ar[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1}
int num = bitArrayToInt32(ar,32);// num = 65

Answer 1

O(n):

int bitArrayToInt32(bool arr[], int count)
{
    int ret = 0;
    int tmp;
    for (int i = 0; i < count; i++) {
        tmp = arr[i];
        ret |= tmp << (count - i - 1);
    }
    return ret;
}

int main()
{
    bool ar[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1};
    int num = bitArrayToInt32(ar,32);
    printf("number = %d\n", num);
}