C Primer Plus（第六版）15.9 编程练习 第5题

//

// main.c

// 15.9-5

//

// Created by cjm on 2024/2/5.

//

#include <stdio.h>

#include <limits.h>

char * itobs(int n, char * ps);

unsigned int rotate(unsigned int x,int i);

int main()

{

unsigned int x=2999999999;

printf("%u\n",rotate(x,3));//注意这里的打印格式

return 0;

}

unsigned int rotate(unsigned int x,int i)

{

unsigned int len;

len = sizeof (unsigned int)*CHAR_BIT;

char str[len+1];

while(i!=0)

{

printf("旋转前 x=%s\n",itobs(x, str));

printf(" x<<1=%s\n",itobs(x<<1, str));

printf("x>>(len-1)=%s\n",itobs(x>>(len-1), str));

x=x<<1|((x>>(len-1))&1);

printf("旋转后 x=%s\n",itobs(x, str));

i--;

}

return x;

}

char * itobs(int n, char * ps)

{

int i;

const static int size = CHAR_BIT * sizeof (int);

for (i = size - 1; i >= 0; i--, n >>= 1)

{

ps[i] = (01 & n) + '0';

}

ps[size] = '\0';

return ps;

}