You are to implement four functions, see comments about what each function should do. We recommend you implement them in the order given, from the easist countKeys to the hardest addKey.

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

Functions to implement

You are to implement four functions, see comments about what each function should do. We recommend you implement them in the order given, from the easist countKeys to the hardest addKey.

// count number of keys in a dict.

int countKeys(const dictNode *dict) { return 0;

}

// given a key, look up its corresponding value in the

// dictionary, returns -1 if the value is not in the dictionary.

// your search for key should end when the key in the next node

// is bigger than the lookup key or you reached the end of the

// list.

int lookupKey(const dictNode *dict, const char *key) { return -1;

}

 

// delete the node in a dict with given key, return the value of

// the deleted node if it was found, return -1 if it wasn't found.

int deleteKey(dictNode **dictPtr, const char *key) { return -1;

}

 

// given a key/value pair, first lookup the key in the dictionary,

// if it is already there, update the dictionary with the new

// value; if it is not in the dictionary, insert a new node into

// the dictionary, still make sure that the key is in alphabetical

// order.

// IMPORTANT: When creating a new node, make sure you dynamically

 

// allocate memory to store a copy of the key in the memory. You

// may use strdup function. DO NOT STORE the input key from the

// argument directly into the node. There is no guarantee that key

// pointer's value will stay the same.

// YOU MUST KEEP THE ALPHABETICAL ORDER OF THE KEY in the dictionary.

void addKey(dictNode **dictPtr, const char *key, int value) { return;

}

Useful library functions

The following library functions would be helpful during your implementation. use the command

 

%man functionName

 to learn more about how to use these library functions.

 

int strcmp(const char *s1, const char *s2); char *strdup(const char *s);

void *malloc(size_t size); void free(void *ptr);

 

Edit/Compile/Test your C code

Compile your code

Assuming you successfully copied and unpacked hw3handout.tar file in ~/311 folder on your W204 account, the following command will help you compile the given C program. The original tar file contains a complete C program that compiles and works.

cse-p204inst11.cse.psu.edu 160% cd ~/311/hw7handout

You use make command in the hw7handout folder to compile all the .c files to create an executable called dict.

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