Why this code is not running? Why str1 is not assigned to str2 ?? I know i have an option of using strcpy but i wish to know the reason why this is not working??

#include<stdio.h>
int main()
{
char str1[]="hello";
char str2[10];
str2=str1;
printf("%s",str2);
return 0;
}

Whereas if I use pointers than it works like here..

#include<stdio.h>
int main()
(
char *s="good morning";
char *q;
q=s;
while(*q!='\0')
{
printf("%c",*q);
q++;
}
return 0;
}

This works. Now the string has been copied via pointers so why such difference??