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/*
4digits - A guess-the-number game, aka Bulls and Cows
Copyright (c) 2004-2011 Pan Yongzhi <http://fourdigits.sourceforge.net>
4digits is a guess-the-number puzzle game. It's called Bulls and Cows,
and in China people simply call it Guess-the-Number. The game's
objective is to guess a four-digit number in 8 times using as less time
as possible. It is similar to Mastermind, but the four digits are
different to each other. 4digits has a graphical user interface version
4digits and a textual user interface version 4digits-text.
4digits is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
4digits is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with 4digits; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#include <string.h>
#include <stdbool.h>
#include <getopt.h>
#include <unistd.h>
//#define DEBUG
#define VERSION_STRING "1.0, Jul 2011"
const char COPYRIGHT[] = "4digits " VERSION_STRING "\n"
"4digits comes with NO WARRANTY to the extent permitted by law.\n"
"This program is free software; you can redistribute it and/or\n"
"modify it under the terms of the GNU General Public License as\n"
"published by the Free Software Foundation - version 2. For more\n"
"information about these matters, see the file named COPYING.\n";
const char AUTHOR[] = "Written by Pan Yongzhi.\n";
const char HELP[] =
"4digits, a guess-the-number game.\n"
"Usage: 4digits [OPTION] ...\n"
"\n"
"You are given eight times to guess a four-digit number. You get\n"
"one A if its value and position are both correct, and you get one\n"
"B if only its value is correct. You win the game when you get 4A0B.\n"
"\n"
"-v, --version \t display the version of 4digits and exit.\n"
"-h, -?, --help \t print this help.\n"
"\n"
"Report bugs at <http://sourceforge.net/projects/fourdigits/>.";
static const char *optString = "vh?";
struct globalArgs_t {
char *version; // version option
} globalArgs;
static const struct option longOpts[] = {
{ "version", no_argument, NULL, 'v' },
{ "help", no_argument, NULL, 'h' },
{ NULL, no_argument, NULL, 0 }
};
void print_help(void);
void display_usage(void);
void gen_rand(int ans_digits[]);
int enter_number(void);
void save_score(const int time_taken);
void compare(const int *in_digits, const int *ans_digits, int *A, int *B);
int tenpow(int power);
void print_help(void) {
(void)puts(HELP);
exit(EXIT_FAILURE);
}
void display_usage(void) {
(void)puts("Usage: 4digits [OPTION]...\n");
(void)puts("Try `4digits --help' for more information.");
exit(EXIT_FAILURE);
}
/* generate a random number */
void gen_rand(int ans_digits[]) {
srand((unsigned)time(NULL));
int ans = 1000 + (int)(8999.0*rand()/RAND_MAX);
for(int i=0; i<4; i++)
ans_digits[i] = (int)(ans/tenpow(3-i)) % 10;
/* if 4 digits is not different from each other, regenerate it*/
while(ans_digits[0]==ans_digits[1] || ans_digits[1]==ans_digits[2]
|| ans_digits[2]==ans_digits[3] || ans_digits[0]==ans_digits[2]
|| ans_digits[0]==ans_digits[3] || ans_digits[1]==ans_digits[3])
{
ans = 1000 + (int)(8999.0 * ((double)rand()/RAND_MAX));
for(int i=0; i<4; i++)
ans_digits[i] = (int)(ans / tenpow(3-i))%10;
}
#ifdef DEBUG
printf("%d\n", ans);
#endif
}
/* enter a 4-digit number */
int enter_number() {
char mstr[5]={'\0','\0','\0','\0','\0'};
int c;
int input;
int in_digits[4]={0,0,0,0}; /* arrays for the 4 digits of input*/
bool reinput;
do {
reinput = false;
printf("Input a 4-digit number:");
if(fgets(mstr, sizeof mstr, stdin) == NULL) {
fprintf(stderr, "Something's got wrong, I'd better quit...\n");
exit(EXIT_FAILURE);
}
// fgets appends the newline entered, if it appears in the first 4
// elements of mstr, then it's sure less than 4 digits are entered
bool flag = false;
if(mstr[0]!='\n'&& mstr[1]!='\n'&& mstr[2]!='\n' &&mstr[3]!='\n')
/* discard the character */
while((c = getchar()) != '\n' && c != EOF)
flag = true;
if (flag == true) {
fprintf(stderr, "Input too long!\n");
reinput = true;
continue;
}
input = atoi(mstr);
if (input < 1000 || input > 9999) {
fprintf(stderr, "Must be a number between 1000 and 9999!\n");
reinput = true;
continue;
}
for(int i=0; i<4; i++)
in_digits[i]=(int) (input / tenpow(3-i) )%10;
if(in_digits[0]==in_digits[1] || in_digits[1]==in_digits[2]
|| in_digits[2]==in_digits[3] || in_digits[0]==in_digits[2]
|| in_digits[0]==in_digits[3] || in_digits[1]==in_digits[3])
{
fprintf(stderr, "Four digits must be unique.\n");
reinput = true;
continue;
}
}while(reinput);
return input;
}
/* compare answer and input, refresh A & B */
void compare(const int *in_digits, const int *ans_digits, int *a, int *b) {
for(register int i=0 ; i<4; i++)
for(register int j=0 ; j<4; j++)
if(in_digits[i] == ans_digits[j])
(i == j) ? (*a)++ : (*b)++;
}
/* save current score in the score file */
void save_score(const int time_taken) {
time_t tm = time(NULL);
struct tm *today = localtime(&tm);
char tmpbuffer[129];
today = localtime(&tm);
const char *sfpath = getenv("HOME");
const char score_filename[] = "/.4digits/4digits-text.4digits.scores";
char *scorefile = (char *)malloc(
strlen(sfpath) + strlen(score_filename) + 1);
if(!scorefile) {
fprintf(stderr, "Memory allocation error.\n");
exit(EXIT_FAILURE);
}
strcpy(scorefile, sfpath);
strcat(scorefile, score_filename);
FILE *sfp = fopen(scorefile, "a+");
if (!sfp) {
fprintf(stderr, "Cannot open score file.\n");
exit(EXIT_FAILURE);
}
strftime(tmpbuffer, 128, "%a %b %d %H:%M:%S %Y", today);
fprintf(sfp, "%s %ds %s\n", getlogin(), time_taken, tmpbuffer);
free(scorefile);
}
int tenpow(int exponent) {
int output = 1;
for(int i=0; i < exponent; i++)
output *= 10;
return output;
}
int main(int argc, char *argv[]) {
int opt = 0;
int longIndex = 0;
/* Initialize globalArgs before we get to work. */
globalArgs.version = NULL; /* false */
// Process the arguments with getopt_long(), then populate globalArgs
opt = getopt_long(argc, argv, optString, longOpts, &longIndex);
while(opt != -1) {
switch(opt) {
case 'v':
globalArgs.version = VERSION_STRING;
printf("%s\n%s", COPYRIGHT, AUTHOR);
exit(1);
case 'h':
print_help();
break;
case '?': /* fall-through is intentional */
display_usage();
break;
case 0: /* long option without a short arg */
if(strcmp("version", longOpts[longIndex].name) == 0)
break;
default:
/* You won't actually get here. */
break;
}
opt = getopt_long(argc, argv, optString, longOpts, &longIndex);
}
int ans_digits[4];
gen_rand(ans_digits); /* array for the 4 digits of n*/
time_t temp = time(NULL);
time_t tic = temp;
int guessed[8] = {0, 0, 0, 0, 0, 0, 0, 0};
int i;
bool dup = false;
for (int num_guess = 0; num_guess < 8; num_guess++) {
int A = 0, B = 0;
int input = enter_number();
for(int i=0; i < num_guess; i++)
// duplicated input
if (input == guessed[i]) {
fprintf(stderr, "You've already guessed it.\n");
--num_guess;
dup = true;
break;
}
if (dup == true) {
dup = false;
continue;
}
int in_digits[4]; /* arrays for the 4 digits of input*/
for(i=0; i<4; i++) {
in_digits[i]=(int) (input / tenpow(3-i) )%10;
}
compare(in_digits, ans_digits, &A, &B);
printf("%dA%dB ", A, B);
if (num_guess != 7)
printf("\t %d times left.\n", 7-num_guess);
guessed[num_guess] = input;
if(A == 4) {
time_t toc = time(NULL);
int score = (int)(toc-tic);
printf("You win! :) Used %d sec.\n", score);
save_score(score); /* save score in the score file */
return 0;
}
}
printf("\nHaha, you lose. It is ");
for(int i = 0; i < 4; i++)
printf("%d", ans_digits[i]);
printf(".\n");
return 0;
}
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