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：
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/**********************************************
** 《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;
}
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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。