1774: [编程入门]C语言之二进制位问题

解题思路:

注意事项:

参考代码:#include<stdio.h>
#include<math.h>
int main()
{
    int getbits(int value, int n1, int n2);
    unsigned int value, a, b;
    scanf("%u%u%u", &value, &a, &b);
    int k = getbits(value, a, b);
    printf("%u", k);
    return 0;
}

int getbits(int value, int n1, int n2)
{
    int i = n2 - n1 + 1;;
    int s = 1, sum = 1;
    for (int k = 0; k < i - 1; k++)
    {
        s *= 2;
        sum += s;
    }
    value = value >> n1;
    value = value & sum;
    return value*pow(2,n1);

}