Linux下C语言&_测试位

(某数&0x04)等价于((某数&0x4)==0x4)

类似汇编的test

#include<stdio.h>#include<string.h>void fun(int s){ printf("- is hex:%x dec:%d\n",s,s); if(s&0x4)printf("-&04\n");  if(s&0x2)printf("-&2\n");  if((s&0x4)==0x4)printf("(-&04)==0x4\n");  if((s&0x4)==1)printf("(-&04)==1\n");  if((s&0x01)==1)printf("(-&0x01)==1\n");}int main(){  int s=0x4;  fun(s);  printf("==============\n");  fun(0x46);  printf("==============\n");  fun(0xf2);  printf("==============\n");  fun(0xf7);  return 0;}

- is hex:4 dec:4
-&04
(-&04)==0x4
==============
- is hex:46 dec:70
-&04
-&2
(-&04)==0x4
==============
- is hex:f2 dec:242
-&2
==============
- is hex:f7 dec:247
-&04
-&2
(-&04)==0x4
(-&0x01)==1