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POSegmentation fault in an attempt to implement a binary tree
 

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  1. POSegmentation fault in an attempt to implement a binary tree
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    <p>I am trying to implement a binary tree structure in C++. I want a tree with '8' depth i.e. I want an attribute_struct with 1 attribute_node and 2 pointers to other 2 attribute_struct to make a binary tree. Here is the data structure and its creation method that I defined :</p> <pre><code>struct person{ public : char name[20]; }; struct attribute_node{ int attribute; person * child_person; }; struct attribute_struct{ attribute_node head_node; attribute_struct * yes_node; attribute_struct * no_node; }; attribute_struct initialize_struct(attribute_struct initial_struct, int prop){ if(prop &lt; 8){ attribute_struct new_yes_struct, new_no_struct; attribute_node temp_yes_node, temp_no_node; temp_yes_node.attribute = prop; temp_yes_node.child_person = NULL; temp_no_node.attribute = prop; temp_no_node.child_person = NULL; new_yes_struct.head_node = temp_yes_node; new_no_struct.head_node = temp_no_node; new_yes_struct.yes_node = NULL; new_no_struct.yes_node = NULL; new_yes_struct.no_node = NULL; new_no_struct.no_node = NULL; attribute_struct temp_yes_struct = initialize_struct(new_yes_struct, prop+1), temp_no_struct = initialize_struct(new_no_struct, prop+1); initial_struct.yes_node = &amp;temp_yes_struct; initial_struct.no_node = &amp;temp_no_struct; return initial_struct; }else{ person temp_person; strcpy(temp_person.name, "temp"); initial_struct.head_node.child_person = &amp;temp_person; return initial_struct; } } attribute_struct create_initial_attribute_structure(){ attribute_struct main_structure; attribute_node temp_node; temp_node.attribute = 3; temp_node.child_person = NULL; main_structure.head_node = temp_node; main_structure.yes_node = NULL; main_structure.no_node = NULL; main_structure = initialize_struct(main_structure, 1); return main_structure; } </code></pre> <p>Well, I am getting a segmentation fault when I try to use the structure as below.</p> <pre><code>int main(){ attribute_struct main_struct = create_initial_attribute_structure(); attribute_struct * current_head; current_head = &amp;main_struct; int iter = 0; while(iter &lt; 7){ current_head = (*current_head).yes_node; cout &lt;&lt; iter &lt;&lt; endl; iter++; } return 0; } </code></pre> <p>I cant determine whether the data structure is created wrong or if I am referencing it the wrong way. I used gdb but as its in the main function with no parameters I am not able to deduce anything.</p> <p>Well the seg fault is after printing iter 2. So, how can I determine whether the attibute_struct defined is correct and with 8 level of depth or whether I am referencing a NULL object? Using if(current_head == NULL) cout &lt;&lt; "Error"; inside the while loop does not help.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USOleg V. Kozlyuk
    1. USuser2365015
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POSegmentation fault in an attempt to implement a binary tree
      1. This table or related slice is empty.
      1. VTDownMod
    1. CO_I used gdb but as its in the main function with no parameters I am not able to deduce anything._ where does gdb indicate you are in code at the time of the crash? Looking at the variables in use, which (pointer) appears invalid and how could it have got that way?
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      1. POSegmentation fault in an attempt to implement a binary tree
      1. USmah
    2. COHello. Questions in Stackoverflow always seem a little nicer, if you actually put a question into them - not just describe a problem.
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      1. POSegmentation fault in an attempt to implement a binary tree
      1. USkratenko
    3. COBacktrace gives me this - #0 0x0000000000400bc2 in ?? () #1 0x0000000000000003 in ?? () #2 0x0000000000000000 in ?? ()
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      1. POSegmentation fault in an attempt to implement a binary tree
      1. USuser2365015
 

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