帮忙改一个C程序，谢谢 - C/C++ / C语言

C/C++ code:
#include <stdio.h>
#include <string.h>
struct s1
{
char a[10];
};
struct s2
{
char b[10];
};

int main()
{
struct s1 *ps1;
struct s2 *ps2;
ps1->a ="wanggl";
strcpy(ps2->b,ps1->a);
printf("%s\n",ps2->b);
getchar();
return 0;
}


1>c:\documents and settings\administrator\桌面\c51\te\te.cpp(16) : error C2440: “=”: 无法从“const char [7]”转换为“char [10]”

---

int main()
{
  struct s1 ps1;
  struct s2 ps2;
  strcpy(ps1.a ,"wanggl");
  strcpy(ps2.b,ps1.a);
  printf("%s\n",ps2.b);
  getchar();
  return 0;
}

---

C/C++ code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct s1
{
char a[10];
};
struct s2
{
char b[10];
};

int main()
{
struct s1 *ps1;
struct s2 *ps2;
ps1 = (struct s1 *)malloc(sizeof(struct s1));
ps2 = (struct s2 *)malloc(sizeof(struct s2));
ps1->a ="wanggl";
strcpy(ps2->b,ps1->a);
printf("%s\n",ps2->b);
getchar();
return 0;
}

上面竟然没分配内