以下代码的打印结果?
#include<stdio.h>
int main()
{
const char* c[] = { "ENTER","NEW","POINT","FIRST" };
const char** cp[] = { c + 3,c + 2,c + 1,c };
const char*** cpp = cp;
printf("%s\n", **++cpp);
printf("%s\n", *-- * ++cpp + 3);
printf("%s\n", *cpp[-2] + 3); printf("%s\n", cpp[-1][-1] + 1);
return 0;
}
答案:
解析:
include<stdio.h>
int main()
{
const char* c[] = { "ENTER","NEW","POINT","FIRST" };
const char** cp[] = { c + 3,c + 2,c + 1,c };
const char*** cpp = cp;
printf("%s\n", **++cpp);//*++cpp为c+2,再解引用指向c+2地址的值即PPOINT
printf("%s\n", *-- * ++cpp + 3);//*++cpp为c+1再减一为c,再解引用指向指针数组变量ENTER,其存放的是ENTER字符串的首地址,再加三得到E的地址,打印得到ER;
printf("%s\n", *cpp[-2] + 3);//即**(cpp-2)+3,*++cpp为c+3,再解引用指向c+3的值,即FIRST的首元素地址,再加三指向S,打印得到ST
printf("%s\n", cpp[-1][-1] + 1);//即*(*(cpp-1)-1)+1,*(cpp-1)为c+2,减一得到c+1,再解引用得到NEW首元素地址,再加一得到E的地址,打印得到EW
return 0;
}