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it's gives error because we can,t assign value in string like ptr="hello world";

there are no errors in the program. since i have executed the same thing. we can assign values to the variables with that object (obj).

#include <stdio.h>

struct st{ 
int a; 
char *ptr; 
}obj; 

main()
{   
   obj.a=10;	
   obj.ptr="Hello World";
   printf("%d,%s",obj.a,obj.ptr);
}

Dynamic allocation is not possible fr char pointer, for that u need to use this procedure:
char arry[100] ; /* store data into this */
char *p = malloc(sizeof(strlen(arry)*char));
strcpy(p,arry);

obj.a = 10;
char buf[12] = "Hello World";
obj.ptr = buf;
cout << "obj.int= " << obj.a << endl;
cout << "obj.ptr= " << obj.ptr << endl;

#include <stdio.h>
struct st{
int a;
char ptr[10];
}obj;
main()
{
struct st obj= {10,"hello world"};
printf("%d,%s",obj.a,obj.ptr);
}

l