转：printf打印输出2进制

 1 void print_2(int val2)
 2 {
 3     unsigned char *p = (unsigned char*)&val2 + 3; //从低位到高位,低端字节计算机
 4     for(int k = 0; k <= 3; k++)
 5     {
 6         int val2 = *(p-k);
 7         for (int i = 7; i >= 0; i--)
 8         {
 9             if(val2 & (1 << i))
10                 printf("1");
11             else
12                 printf("0");
13         }
14         printf(" ");
15     }
16 }