這是一個記憶測試遊戲。螢幕上顯示很短時間的數字。玩家必須在數字消失之前記住他們，然後輸入這串數字。每次過後，計算機顯示更長一串數字，讓玩家繼續玩下去。

2.問題分析：

程式產生 0~9 的整數，螢幕上顯示1秒鐘，之後刪除它們。然後提示玩家輸入之前的整數。若輸入成功，遊戲繼續。並且數字會隨遊戲變長，直到輸入錯誤，遊戲結束。

程式邏輯流程圖：

原始碼：

#include <stdio.h>
#include <ctype.h>
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>

int main(void)
{
	char another_game = 'Y';
	
	bool correct = false; 
	
	int counter = 0;
	
	int sequence_length = 0;
	time_t seed = 0;
	int number = 0;
	
	time_t now = 0;
	int time_taken = 0;
	
	printf("\nTo play Simple Simon, "
		"watch the screen for a sequence of dights.");
	printf("\nWatch carefully, as the dights are only displayed"
		" for a second! ");	
	printf("\nThe computer will remove them, and then promt 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);	
	int i = 0;
	
	do
	{
		correct = true;
		counter = 0;
		sequence_length = 2;
		time_taken = clock();
		
		while(correct)
		{
			sequence_length += (counter++) % 3 == 0;
			
			seed = time(NULL);
			
			now = clock();
			
			srand((unsigned int)seed);
			for( i = 1; i <= sequence_length; i++)
				printf("%d ", rand() % 10);
				
			for(; clock() - now < CLOCKS_PER_SEC; )
                  ;
            printf("\r");
            for(i = 1; i <= sequence_length; i++)
                printf("  ");
             
            if(counter == 1)
                printf("\nNow you enter the sequence - don't forget"
                      " the spaces\n");
            else
                printf("\r");                      	
			srand((unsigned int)seed);
			for( i = 1; i <= sequence_length; i++)
			{
				scanf("%d", &number);
				if(number != rand() % 10)
				{
					correct = false;
					break;
				}
			}
			printf("%s\n", correct ? "Correct!" : "Wrong!");	
				
		}
		time_taken = (clock() - time_taken);
		
		printf("\n\n Your Score is %d", (--counter * 100) / time_taken);
		fflush(stdin);
		/**/
		
		/**/
		
		printf("\nDo you want to play again(y/n)?");
		scanf("%c", &another_game);
	}while(toupper(another_game) == 'Y');
	return 0;
}