//function to recursively solve sudoku oldgrid by guessing and backtracking
int guess(char oldgrid[9][9][10]) {
char i,j,k;
for(i=0;i<9;++i)
for(j=0;j<9;++j)
if(!oldgrid[i][j][0])
for(k=1;k<10;++k)
if(oldgrid[i][j][k]) {
char newgrid[9][9][10];
//guessing
guessed(oldgrid,newgrid,i,j,k);
//solving according to guess
solve(newgrid);
//checking if solved
if(solved(newgrid)) {
output(newgrid);
return 1;
}
//guessing recursively
if(guess(newgrid))
return 1;
//eliminating guess
oldgrid[i][j][k]=0;
solve(oldgrid);
}
return 0;
}
int main(void)
{/************/
int number, guess;
char play_again = 'y';
srand(time(NULL));
while (play_again == 'y') {
number = 1 + rand() % 1000;
/* This printf should be cancelled once bug is fixed */
printf("%d\n", number);
printf("I have a number beetween 1 and 1000\n"
"Can you guess my number?\n"
"Please type your first guess: ");
scanf("%d", &guess);
while (guessed(number, guess) == 0)
scanf("%d", &guess);
printf("Would you like to play again? (y o n)");
/* This printf should be cancelled once bug is fixed */
printf("\n%c\n", play_again);
/* This second scanf could fall in the classic problem of newline left
* sitting in the buffer after (first) scanf(). Please take a
* look at:
*/
/* + http://cboard.cprogramming.com/showthread.php?s=c85a7ea9a4048feb99ddadb1c380a734&t=95886 */
/* + http://www.phanderson.com/C/scanf.html */
scanf("\n%c", &play_again);
/* Notice \n before %c */
}
return 0;
}
