本文实例展示了C语言循环结构与时间函数用法,对于C语言的学习来说是非常不错的参考借鉴材料。分享给大家供大家参考之用。具体如下:
完整实例代码如下:
/********************************************** ** 《Beginning C 4th Edition》 Notes codes ** Created by Goopand ** Compiler: gcc 4.7.0 ***********************************************/ /* Simon games : memory ability test */ #include <stdio.h> /* for printf(),scanf() function */ #include <ctype.h> /* for tolower() function */ #include <stdbool.h> /* for bool type: true, false */ #include <time.h> /* for time() function */ #include <stdlib.h> /* for rand(),srand() function */ int main( void ) { char nextGame = 'Y' ; /* go ahead for another game */ bool correct = false ; /* guess correctly */ int counter = 0; /* number of sequences guessed correctly */ int seq_len = 0; /* length of sequence */ int input_num = 0; /* stores an input digit */ time_t seed = 0; /* seed value for random number sequence */ //int i = 0; /* for loop variable */ clock_t start_clock = 0; /* record start clock time (not second) */ int time_taken = 0; /* Time used for game in seconds */ printf ( "Here is a simon game for training memory ability .\n" ); printf ( "\nThe screen will show a number sequence for 1 second , " ); printf ( "then the sequence will disappear. You are suggested to " "input the same sequence to pass the game.\n" ); printf ( "\nNotice this: each digit is seperated by a space. \n" ); printf ( "\nNow press Enter to play .. Good luck !\n" ); scanf ( "%c" ,&nextGame); //Waiting for user's input do { correct = true ; counter = 0 ; /* successful tries */ seq_len = 2 ; /* Initial length of a digit sequence */ time_taken = clock (); while (correct) { /* On each third successful try, increase the squence length */ seq_len += (counter++ % 3 == 0); //if "==" expression is true,returns 1; else returns 0 /* time(NULL) returns number of seconds since 1970-01-01 */ seed = time (NULL); /* Generate and display a sequence of random numbers */ srand ((unsigned int )seed); //initialize the seed for rand() function for ( int i=0; i<seq_len; i++) printf ( "%d " , rand () % 10); //Output a random digit and a space /* Wait one second */ start_clock = clock () ; //returns start clock time,clock() is a timer for (; clock () - start_clock < CLOCKS_PER_SEC;) ; //CLOCKS_PER_SEC is a const defined in time.h /* Now overwrite the digit sequence */ printf ( "\r" ); //control char "\r" : locator back to beginning of the line for ( int i=0; i<seq_len; i++) printf ( " " ); //two spaces to overwrite the sequence printf ( "\r" ); /* Check wether the input sequence is correct */ srand ((unsigned int )seed); //Restart the random sequence for ( int i=0; i<seq_len; i++) { scanf ( "%d" ,&input_num); //Read an input number if (input_num != rand () % 10 ) { correct = false ; break ; } } 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 total game score */ printf ( "\n\nYour score is %d" , --counter * 100 / time_taken); fflush (stdin); //Empty the input buffer printf ( "\nDo you want to play again (y/n)? " ); scanf ( "%c" ,&nextGame); } while ( tolower (nextGame) == 'y' ); return 0; } |
本文实例源自国外网站,为一个数字游戏,感兴趣的读者可以调试运行一下,体会代码的原理,加深对C语言循环结构域时间函数的认识。
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