So I'm gradually learning C from this: http://www.amazon.com/Beginning-From-Novice-Professional/dp/1590597354 but there's an example that fails to work (on Linux) even when I straight copy it from the book. The problem occurs as soon as the random input is shown, so I as soon as I press enter nothing appear and thus it is an impossible game as it never showed me the string of digits I'm supposed to repeat. I'd try and figure it out but for all I know, what this book says is outdated.
Code:
/* Program 4.12 Simple Simon */
#include <stdio.h> /* For input and output */
#include <ctype.h> /* For toupper() function */
#include <stdbool.h> /* For bool, true, false */
#include <stdlib.h> /* For rand() and srand() */
#include <time.h> /* For time() and clock() */
int main(void)
{
/* Records if another game is to be played */
char another_game = 'Y';
/* true if correct sequence entered, false otherwise */
int correct = false;
/* Number of sequences entered successfully */
int counter = 0;
int sequence_length = 0; /* Number of digits in a sequence */
time_t seed = 0; /* Seed value for random number sequence */
int number = 0; /* Stores an input digit */
time_t now = 0; /* Stores current time - seed for random values */
int time_taken = 0; /* Time taken for game in seconds */
/* Describe how the game is played */
printf("\nTo play Simple Simon, ");
printf("watch the screen for a sequence of digits.");
printf("\nWatch carefully, as the digits are only displayed"
" for a second! ");
printf("\nThe computer will remove them, and then prompt you ");
printf("to enter the same sequence.");
printf("\nWhen you do, you must put spaces between the digits. \n");
printf("\nGood Luck!\nPress Enter to play\n");
scanf("%c", &another_game);
/* One outer loop iteration is one game */
do
{
correct = true; /* By default indicates correct sequence entered */
counter = 0; /* Initialize count of number of successful tries*/
sequence_length = 2; /* Initial length of a digit sequence */
time_taken = clock(); /* Record current time at start of game */
/* Inner loop continues as long as sequences are entered correctly */
while(correct)
{
/* On every third successful try, increase the sequence length */
sequence_length += counter++%3 == 0;
/* Set seed to be the number of seconds since Jan 1,1970 */
seed = time(NULL);
now = clock(); /* record start time for sequence */
/* Generate a sequence of numbers and display the number */
srand((unsigned int)seed); /* Initialize the random sequence */
for(int i = 1; i <= sequence_length; i++)
printf("%d ", rand() % 10); /* Output a random digit */
/* Wait one second */
for( ;clock() - now < CLOCKS_PER_SEC; );
/* Now overwrite the digit sequence */
printf("\r"); /* go to beginning of the line */
for(int i = 1; i <= sequence_length; i++)
printf(" "); /* Output two spaces */
if(counter == 1) /* Only output message for the first try */
printf("\nNow you enter the sequence - don't forget"
" the spaces\n");
else
printf("\r"); /* Back to the beginning of the line */
/* Check the input sequence of digits against the original */
srand((unsigned int)seed); /* Restart the random sequence */
for(int i = 1; i <= sequence_length; i++)
{
scanf("%d", &number); /* Read an input number */
if(number != rand() % 10) /* Compare against random digit */
{
correct = false; /* Incorrect entry */
break; /* No need to check further... */
}
}
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 game score */
printf("\n\n Your score is %d", --counter * 100 / time_taken);
fflush(stdin);
/* Check if new game required*/
printf("\nDo you want to play again (y/n)? ");
scanf("%c", &another_game);
}while(toupper(another_game) == 'Y');
return 0;
}
Last edited by Monado_III,
