关于win32与win64的兼容性问题

源代码：
（操作系统作业）printf("\nMemory attached at %X\n",(int)shm);

shm是个char*地址；

gcc编译出现警告：[email protected]:~ $ gcc -o shmread shmread.c
shmread.c: In function ‘main’:
shmread.c:31:40: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
printf("\nMemory attached at %X\n",(int)shm);
^
错误原因：企图将指针类型转换为无符号32位整型数，但这在64位环境下会发生兼容性问题。
解决办法：printf("\nMemory attached at %ld\n",(long)shm);