算术/逻辑移位的实现。

2019-11-10 20:17:21

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/*.c文件声明：算术/逻辑移位的实现。C语言的移位要取决于数据类型：对于无符号数，左移时右侧补0（相当于逻辑移位）对于无符号数，右移时左侧补0（相当于逻辑移位）对于有符号数，左移时右侧补0（叫算术移位，相当于逻辑移位）对于有符号数，右移时左侧补符号位（如果正数就补0，负数就补1，叫算术移位），原来符号位的值会被移到下一位！PRintf中的%d表示：十进制整数。由下例可知，它可以自动识别该数是有符号数还是无符号数。*/#include<stdio.h>int main(void){short signed_bit_8 = 0xffff;//直接将该变量塞爆，无报错。直接写该内存空间。unsigned short unsigned_bit_8 = 0xffff;printf("signed_bit_8 = %d/n",signed_bit_8);//out_put = -1printf("unsigned_bit_8 = %d/n",unsigned_bit_8);//out_put = 65535signed_bit_8 = signed_bit_8 << 1;unsigned_bit_8 = unsigned_bit_8 << 1;printf("signed_bit_8 = %d/n",signed_bit_8);//out_put = -2printf("unsigned_bit_8 = %d/n",unsigned_bit_8);//out_put = 65534signed_bit_8 = 0xffff;unsigned_bit_8 = 0xffff;signed_bit_8 = signed_bit_8 >> 1;unsigned_bit_8 = unsigned_bit_8 >> 1;printf("signed_bit_8 = %d/n",signed_bit_8);//out_put = -1printf("unsigned_bit_8 = %d/n",unsigned_bit_8);//out_put = 32767return 0;}

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