Things we've covered this year

• command line interface to compile c code:

>>> gcc family-tree.c -o family-tree

• writing header files and breaking up c into multiple linked files. Example header file that includes definitions for each sort function:

void selectionSort(int arr[], int n);

void insertionSort(int arr[], int n);

void bubbleSort(int arr[], int n);

• big O notation and sorting functions; selection, bubble, and insertion are all O(n2) while merge, quick and heap are are typically O(nlogn) or similar because they break the problem in half at each computation
• Defining structures and creating types:

typedef struct _node *node;
struct _node{
  char name[20];
  int child_amount;
  node mother;
  node father;
  node spouse;
  node *children;
};

• Allocating memory properly when declaring a structure. IE: if you're declaring a pointer to a block of memory you first have to allocate that block of memory.

node newNode(char *title){
  node person = malloc(sizeof(struct _node));
  person->children = malloc(sizeof(node) * 10);
  strncpy(person->name, title, 20);
  person->mother = NULL;
  person->father = NULL;
  person->spouse = NULL;
  int child_amount = 0;
  return person;
};

• Above works, below doesnt:

node newNode(char *title){
  node person;
  strncpy(person->name, title, 20);
  person->mother = NULL;
  person->father = NULL;
  person->spouse = NULL;
  int child_amount = 0;
  return person;
};

• Passing pointers properly - for instance if you are passing arguments to a function that takes pointers, you can pass a pointer, or you can pass the address of a variable with &var
• setting up linked lists and trees with structures that contain pointers to the next structure
• Navigating trees using recursion

Using Recursion

• Implemented a depth-first search with whitespace adding
• printout is little off, not quite sure why but it mostly works, here's the output:

>>> ./family-tree
greg Spouse: laurie
   nate Spouse: wifey
     child1
       childOfChild1
         childOfChildOfChild1
    child2
 caitlin

• caitlin should line up with nate and child1 should line up with child2... it also crashes periodically and infinite loops spaces... but works 4 out of 5 times and prints that.

attachments

		last modified	size
	family-tree.c	Fri Oct 31 2025 12:38 pm	3.0K