算術/邏輯移位的實現。

2019-11-10 19:13:24

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/*.c文件聲明：算術/邏輯移位的實現。C語言的移位要取決于數據類型：對于無符號數，左移時右側補0（相當于邏輯移位）對于無符號數，右移時左側補0（相當于邏輯移位）對于有符號數，左移時右側補0（叫算術移位，相當于邏輯移位）對于有符號數，右移時左側補符號位（如果正數就補0，負數就補1，叫算術移位），原來符號位的值會被移到下一位！PRintf中的%d表示：十進制整數。由下例可知，它可以自動識別該數是有符號數還是無符號數。*/#include<stdio.h>int main(void){short signed_bit_8 = 0xffff;//直接將該變量塞爆，無報錯。直接寫該內存空間。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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