/**********************************************
** 《Beginning C 4th Edition》 Notes codes
** Created by Goopand
** Compiler: gcc 4.7.0
***********************************************/
/* Simon games : memory ability test */
#include <stdio.h> /* for printf(),scanf() function */
#include <ctype.h> /* for tolower() function */
#include <stdbool.h> /* for bool type: true, false */
#include <time.h> /* for time() function */
#include <stdlib.h> /* for rand(),srand() function */
int
main(
void
)
{
char
nextGame =
'Y'
;
/* go ahead for another game */
bool
correct =
false
;
/* guess correctly */
int
counter = 0;
/* number of sequences guessed correctly */
int
seq_len = 0;
/* length of sequence */
int
input_num = 0;
/* stores an input digit */
time_t
seed = 0;
/* seed value for random number sequence */
//int i = 0; /* for loop variable */
clock_t
start_clock = 0;
/* record start clock time (not second) */
int
time_taken = 0;
/* Time used for game in seconds */
printf
(
"Here is a simon game for training memory ability .\n"
);
printf
(
"\nThe screen will show a number sequence for 1 second , "
);
printf
(
"then the sequence will disappear. You are suggested to "
"input the same sequence to pass the game.\n"
);
printf
(
"\nNotice this: each digit is seperated by a space. \n"
);
printf
(
"\nNow press Enter to play .. Good luck !\n"
);
scanf
(
"%c"
,&nextGame);
//Waiting for user's input
do
{
correct =
true
;
counter = 0 ;
/* successful tries */
seq_len = 2 ;
/* Initial length of a digit sequence */
time_taken =
clock
();
while
(correct)
{
/* On each third successful try, increase the squence length */
seq_len += (counter++ % 3 == 0);
//if "==" expression is true,returns 1; else returns 0
/* time(NULL) returns number of seconds since 1970-01-01 */
seed =
time
(NULL);
/* Generate and display a sequence of random numbers */
srand
((unsigned
int
)seed);
//initialize the seed for rand() function
for
(
int
i=0; i<seq_len; i++)
printf
(
"%d "
,
rand
() % 10);
//Output a random digit and a space
/* Wait one second */
start_clock =
clock
() ;
//returns start clock time,clock() is a timer
for
(;
clock
() - start_clock < CLOCKS_PER_SEC;) ;
//CLOCKS_PER_SEC is a const defined in time.h
/* Now overwrite the digit sequence */
printf
(
"\r"
);
//control char "\r" : locator back to beginning of the line
for
(
int
i=0; i<seq_len; i++)
printf
(
" "
);
//two spaces to overwrite the sequence
printf
(
"\r"
);
/* Check wether the input sequence is correct */
srand
((unsigned
int
)seed);
//Restart the random sequence
for
(
int
i=0; i<seq_len; i++)
{
scanf
(
"%d"
,&input_num);
//Read an input number
if
(input_num !=
rand
() % 10 )
{
correct =
false
;
break
;
}
}
printf
(
"%s\n"
,correct ?
"Correct !"
:
"Wrong !"
);
}
/* Calculate total time to play the game in seconds */
time_taken=(
clock
() - time_taken) / CLOCKS_PER_SEC ;
/* Output the total game score */
printf
(
"\n\nYour score is %d"
, --counter * 100 / time_taken);
fflush
(stdin);
//Empty the input buffer
printf
(
"\nDo you want to play again (y/n)? "
);
scanf
(
"%c"
,&nextGame);
}
while
(
tolower
(nextGame) ==
'y'
);
return
0;
}