[linux-help] C help!!(out of list discussion subject)

[Weqaar Ali Janjua <wxjanjua@xxxxxxxxxxx>]

Hello guyz,

     This question is kinda out of the list discussion but any help will be 
greatly appreciated. Can anybody help me out with the following C 
programming problem:

I make a structure with some char type variables:
-------------------START OF CODE------------------------------
/*POINTER TEST*/
#include <stdio.h>

//Structure Definition
struct weqaar {
char *fish;
char *sick;
};

int main(void) {
struct weqaar a; //initializing variable of type 'struct weqaar'
struct weqaar b; //initializing variable of type 'struct weqaar'
struct weqaar *ptr;
ptr=&a;

printf("\nenter value of a.fish:");
gets(a.fish);
printf("\nenter value of a.sick:");
gets(a.sick);
printf("%s\t%s",a.fish,a.sick);
printf("\n");
//checking the values stored in mem.
printf("b.fish is %s,\tb.sick is %s",b.fish,b.sick);
//
printf("\n");
printf("\nenter value of b.fish:");
gets(b.fish);
printf("\nenter value of b.sick:");
gets(b.sick);
printf("%s\t%s",b.fish,b.sick);
printf("\n");
printf("%s\t%s",a.fish,a.sick);
printf("\n");
printf("PTR values are: %s\t%s\n",ptr->fish,ptr->sick);
printf("Mem. location addresses of b.fish and b.sick are %p %p",b.fish,b.sick);
return 0;
}
-------------------END OF CODE------------------------------
Now I execute the program and store some data in the variables suppose:
I enter 'ash' in 'a.fish' and 'dish' in 'a.sick' AND 'madonna' in 'b.fish' 
and 'nicole' in 'b.sick' and then terminate the program.
When I run the program again  the commented line in my C prog. gives me the 
output "madonna    nicole", that means the values are still 
there(structures being of storage type static) and my last line prints out 
the memory addresses '0C5B' and 'FFF0' of variables 'b.fish' and 'b.sick' 
and the program terminates exit(1). Then I note these addresses and write 
another piece of code:
-------------------START OF CODE------------------------------
#include <stdio.h>

int main(void) {
char *hackPtr=0xFFF0; //note that line
printf("%s",hackPtr);
return 0;
}
-------------------END OF CODE------------------------------
now note the line 'char *hackPtr=0xFFF0;' , I have to specify 0x before the 
address I got from the output of my first program, If I dont specify '0x' 
the compiler takes it as a string value, my core question is how can I get 
the accurate/in-the-form memory address as '0xFFF0'?? and how can I make my 
other program modify the value in that location???can I read the string in 
that location with my second program???or do I have to decode the value I 
get(maybe HEX)???? AND how can I make structure of any non-static storage 
type?????
Thanx in advance,
Weqaar Ali Janjua
BECE
Wichita State University


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