将布尔数组转换为int32，unsigned int和double? [英] Convert bool array to int32 ,unsigned int and double?

问题描述

我将布尔数组的大小设置为:32、48、64(每个布尔值代表一点).如何将它们转换为具有良好性能的数字(int，unsigned int，double48，double64)? 例如:

I've bool arrays of sizes : 32, 48, 64 (each boolean represents a bit). how can I convert them to a number with a good performance( int, unsigned int, double48, double64)? for example :

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

推荐答案

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);
}

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