#include<stdio.h>


int setbits( unsigned int x, int p, int n, unsigned int y )
{
    unsigned int mask = ~(~0 << n);     //得到一个n位为1的掩码
    unsigned int y_n = y & mask;        //获取y的最右边n位

    x = x & ~(mask << (p-n+1));     //清除
    x = x | (y_n << (p-n+1));

    return x;
}


int main()
{
    int x = 60;     // 00111100
    int y = 36;     // 00100100     目的值为，00110000, 48
    int p = 4;
    int n = 3;

    printf("%d\n", setbits( x, p, n, y ));
    

    return 0;
}