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("%sn",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("nnYour 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。