为结构体成员分配内存（vc++6.0调试）

#include <stdio.h>
#include <string.h>
// #include <stdlib.h>     //if open ,error occur.

typedef struct stu
{
 char *name;
 int soc;
 int ll;

};

int main()
{
 struct   stu st;
 st.name = ( char *)malloc(sizeof( struct stu));  //if struct use '->',error occur!!!!
 strcpy(st.name,"asfghjkll ");
 st.soc=99;
 printf("st.name is %s\n",st.name);
 printf("st.soc is %d\n",st.soc);
 printf("st.soc is %d\n",sizeof(  st));  //size of st.name is 4.in vc++6.0.

 free(st.name);
return 0;

}