# write the //TODO part of the program: /*************************************************************************** * scramble.c * * Problem Set 3 * * Implements Scramble with CS50. …

write the //TODO part of the program:

/***************************************************************************
* scramble.c
*
* Problem Set 3
*
* Implements Scramble with CS50.
*
* Usage: scramble [#]
*
* where # is an optional grid number.
***************************************************************************/

#include [removed]
#include [removed]
#include [removed]
#include [removed]
#include [removed]
#include [removed]

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// duration of a game in seconds
#define DURATION 30

// grid’s dimensions
#define DIMENSION 4

// maximum number of words in any dictionary
#define WORDS 172806

// maximum number of letters in any word
#define LETTERS 29

// default dictionary
// http://www.becomeawordgameexpert.com/wordlists.htm
#define DICTIONARY “words”

// for logging
FILE* log;

// grid
char grid[DIMENSION][DIMENSION];

// flags with which we can mark grid’s letters while searching for words
bool marks[DIMENSION][DIMENSION];

// defines a word as having an array of letters plus a flag
// indicating whether word has been found on grid
typedef struct
{
bool found;
char letters[LETTERS + 1];
}
word;

// defines a dictionary as having a size and an array of words
struct
{
int size;
word words[WORDS];
}
dictionary;

// prototypes
void clear(void);
bool crawl(string letters, int x, int y);
void draw(void);
bool find(string s);
void initialize(void);
bool lookup(string s);
void scramble(void);

// This is Scramble.
int main(int argc, string argv[])
{
// ensure proper usage
if (argc > 2)
{
printf(“Usage: %s [#]n”, basename(argv[0]));
return 1;
}

// seed pseudorandom number generator
if (argc == 2)
{
int seed = atoi(argv[1]);
if (seed <= 0)
{
printf(“Invalid grid.n”);
return 1;
}
srand(seed);
}
else
srand(time(NULL));

// determine path to dictionary
string directory = dirname(argv[0]);
char path[strlen(directory) + 1 + strlen(DICTIONARY) + 1];
sprintf(path, “%s/%s”, directory, DICTIONARY);

{
printf(“Could not open dictionary.n”);
return 1;
}

// initialize the grid
initialize();

// initialize user’s score
int score = 0;

// calculate time of game’s end
int end = time(NULL) + DURATION;

// open log
log = fopen(“log.txt”, “w”);
if (log == NULL)
{
printf(“Could not open log.n”);
return 1;
}

// accept words until timer expires
while (true)
{
// clear the screen
clear();

// draw the current state of the grid
draw();

// log board
for (int row = 0; row < DIMENSION; row++)
{
for (int col = 0; col [removed]= end)
{
printf(“33[31m”); // red
printf(“Time: %dnn”, 0);
printf(“33[39m”); // default
break;
}

// report time remaining
printf(“Time: %dnn”, end – now);

// prompt for word
printf(“> “);
string s = GetString();

// quit playing if user hits ctrl-d
if (s == NULL)
break;

// log word
fprintf(log, “%sn”, s);

// check whether to scramble grid
if (strcmp(s, “SCRAMBLE”) == 0)
scramble();

// or to look for word on grid and in dictionary
else
{
if (find(s) && lookup(s))
score += strlen(s);
}
}

// close log
fclose(log);

return 0;
}

/**
* Clears screen.
*/
void clear()
{
printf(“33[2J”);
printf(“33[%d;%dH”, 0, 0);
}

/**
* Crawls grid recursively for letters starting at grid[x][y].
* Returns true iff all letters are found.
*/
bool crawl(string letters, int x, int y)
{
// if out of letters, then we must’ve found them all!
if (strlen(letters) == 0)
return true;

// don’t fall off the grid!
if (x [removed]= DIMENSION)
return false;
if (y [removed]= DIMENSION)
return false;

// been here before!
if (marks[x][y])
return false;

// check grid[x][y] for current letter
if (grid[x][y] != letters[0])
return false;

// mark location
marks[x][y] = true;

// look left and right for next letter
for (int i = -1; i <= 1; i++)
{
// look down and up for next letter
for (int j = -1; j <= 1; j++)
{
// check grid[x + i][y + j] for next letter
if (crawl(&letters[1], x + i, y + j))
return true;
}
}

// unmark location
marks[x][y] = false;

// fail
return false;
}

/**
* Prints the grid in its current state.
*/
void draw(void)
{
// TODO
}

/**
* Returns true iff word, s, is found in grid.
*/
bool find(string s)
{
// word must be at least 2 characters in length
if (strlen(s) < 2)
return false;

// search grid for word
for (int row = 0; row < DIMENSION; row++)
{
for (int col = 0; col < DIMENSION; col++)
{
// reset marks
for (int i = 0; i < DIMENSION; i++)
for (int j = 0; j < DIMENSION; j++)
marks[i][j] = false;

// search for word starting at grid[i][j]
if (crawl(s, row, col))
return true;
}
}
return false;
}

/**
* Initializes grid with letters.
*/
void initialize(void)
{
// http://en.wikipedia.org/wiki/Letter_frequency
float frequencies[] = {
8.167, // a
1.492, // b
2.782, // c
4.253, // d
12.702, // e
2.228, // f
2.015, // g
6.094, // h
6.966, // i
0.153, // j
0.747, // k
4.025, // l
2.406, // m
6.749, // n
7.507, // o
1.929, // p
0.095, // q
5.987, // r
6.327, // s
9.056, // t
2.758, // u
1.037, // v
2.365, // w
0.150, // x
1.974, // y
0.074 // z
};
int n = sizeof(frequencies) / sizeof(float);

// iterate over grid
for (int row = 0; row < DIMENSION; row++)
{
for (int col = 0; col < DIMENSION; col++)
{
// generate pseudorandom double in [0, 1]
double d = rand() / (double) RAND_MAX;

// map d onto range of frequencies
for (int k = 0; k < n; k++)
{
d -= frequencies[k] / 100;
if (d < 0.0 || k == n – 1)
{
grid[row][col] = ‘A’ + k;
break;
}
}
}
}
}

/**
* Loads words from dictionary with given filename, s, into a global array.
*/
{
// open dictionary
FILE* file = fopen(s, “r”);
if (file == NULL)
return false;

// initialize dictionary’s size
dictionary.size = 0;

char buffer[LETTERS + 2];
while (fgets(buffer, LETTERS + 2, file))
{
// overwrite n with
buffer[strlen(buffer) – 1] = ‘’;

// capitalize word
for (int i = 0, n = strlen(buffer); i < n; i++)
buffer[i] = toupper(buffer[i]);

// ignore SCRAMBLE
if (strcmp(buffer, “SCRAMBLE”) == 0)
continue;

// copy word into dictionary
dictionary.words[dictionary.size].found = false;
strncpy(dictionary.words[dictionary.size].letters, buffer, LETTERS + 1);
dictionary.size++;
}

// success!
return true;
}

/**
* Looks up word, s, in dictionary. Iff found (for the first time), flags word
* as found (so that user can’t score with it again) and returns true.
*/
bool lookup(string s)
{
// TODO
return false;
}

/**
* Scrambles the grid by rotating it 90 degrees clockwise, whereby
* grid[0][0] rotates to grid[0][DIMENSION – 1].
*/
void scramble(void)
{
// TODO
}

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