i get illegal operation.

im new in C++

this is only a sample code:

Code:

---

#include <iostream>
#include <fstream>
using namespace std;

int main () {
    char *a;
    char *b;
    char *c;
    char *d;
    ifstream ab ("word.txt");
    ifstream bb ("wordlist.txt");
    ab>>c; //line 11    b=c;
    cout<<b;
    bb>>d; //line 14
    a=d;
    cout<<b<<a;
    cin.get();
}

---

note: the text with red font is the coz of "illegal operation" but if i change it to a same variable i dont recieve illegal operation but whenever line 14 is executed both variable b and a change to the value from the document.

this is the problem if i use same variable to line 11 and 14:
i change the variable c to d from line 11.

ab>>d;
b=d; meaning if string from the word.txt is aaaa, b = "aaaa"
when line 14 is executed
ab>>d;
a=d; if string from wordlist.txt is bbbb supposed to be a= "bbbb"
but b is also become b= "bbbb"

any help!!

Your pointers a, b, c and d are pointing at "random" locations, you need to allocate some memory, or otherwise point at some valid memory location.

--
Mats

Just use std::string instead of raw char pointers.

i am new in C++ and dont know how to allocate memory can you give me a sample? thanks

Just use std::string instead.

Here's a quick introduction:

http://www.cprogramming.com/tutorial/string.html