循环实例子：do while;while,for,伪bool型
注意：在C语言中，变量必须声明在函数开始的地方
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#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
#include<time.h>
#define true 1???
#define false 0?
int main(){
???
??? char another_game ='Y' ;
??? int correct = false;
??? int counter = 0 ;
??? int sequence_length = 0 ;
??? time_t seed = 0 ;
??? int number = 0 ;
??? time_t now = 0 ;
??? int time_taken = 0 ;
??? int i =0;
??? printf(" \n To play Simple Simon ,");
??? printf(" \n Watch carefully ,sa the digits are only displayed for a second !");
??? printf(" \n the computer will remove them , and then prompt you ");
??? printf(" to enter the same sequence.");
??? printf(" \n When you do , you must put spaces between the digits.\n");
??? printf(" \n GOOD lUCK !\n Press Enter to play \n");
??? scanf("%C",&another_game);
??? 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);
??? ??????? //i要在开始的时候声明，在此int i = 0 ; 是不对的
??? ??? ??? for(? i = 1 ; i <= sequence_length ; i ++){
??? ??? ??? ??? printf("%d",rand() % 10);
??? ??? ??? }
??? ??? ??? for(;clock() - now <CLOCKS_PER_SEC;);
??? ??? ??? printf("\r");
??? ??? ??? for( i =0 ;i <= sequence_length ; i++){
??? ??? ??? ??? printf(" ");
??? ??? ??? }
??? ??? ??? if(counter == 1){
??? ??? ??? ??? printf("\n Now 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("\n DO you want to play again (y/n)? ");
??? ??? scanf("%c",&another_game);
??? }while(toupper(another_game) == 'Y' );
??? return 0 ;
}
