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（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（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;
}