[求助]还是指针问题呢．迷茫

#include <iostream.h>
void main()
{char s[]=”hello”;
s[0]=’a’
cout<<s[0]<<endl;
char *p=”hello”;
p[0]=’a’;
cout<<p[0]<<endl;}

字符指针与字符数组的关系．搞不明白呢　　找高手帮我．