structure and pointer

[askcq]

#include <stdio.h>

typedef struct exam ex;
struct exam {
int val;
};

int main() {
int aa;
ex user;
ex *ex_ptr;

printf("\n value ");
scanf("%d", &(ex_ptr->val));
ex_ptr = &user;
printf("%d",*(i nt *)aa= (ex_ptr->val));

}

iam trying to assign the value "val" to the integer aa.
But segmentation fault arises ...pls help

[weaknessforcats]

On line 14 you are using ex_ptr before you put an address in it:

[code=c]
scanf("%d", &(ex_ptr->val));
[/code]

[askcq]

yes changed it ...but again the same error occurs

[gpraghuram]

HI,
Allocate memory for the pointer and the call scanf.

ex *ex_ptr=(struct exam*)malloc(sizeof(struct exam)); ///Add this line

printf("\n value ");
scanf("%d", &(ex_ptr->val));

Thanks
Raghuram

[askcq]

yes....but still it shows error ...

[weaknessforcats]

yes....but still it shows error ...

Not when I ran this code:
[code=c]
ex *ex_ptr=(struct exam*)malloc(si zeof(struct exam)); ///Add this line

printf("\n value ");
scanf("%d", &(ex_ptr->val));
printf("You entered %d\n", ex_ptr->val);

}
[/code]