C/C++调用系统函数API显示系统时间

计算机操作系统上课作业：
C/C++调用系统函数API显示系统时间，代码展示如下
[code]
#include <stdio.h>
#include <math.h>-
#include <dos.h>
#include <time.h>
#include <windows.h>
#include <conio.h>

void main()
{
	tm *curtime;
	time_t t;
	do
	{
	    t=time(NULL);
		curtime=localtime(&t);/*得到当前系统时间*/
		printf("*********************************************\n");
		printf("** This is a simple clock program.         **\n");
		printf("**                                         **\n");
		printf("*********************************************\n");
		printf("The current time is:\n");
		if((float)curtime->tm_hour<=12)         /*午前的处理*/
		{
			printf("AM ");
			if((float)curtime->tm_hour<10)
				printf("0");   /*十点之前在小时数前加零*/
			printf("%.0f:",(float)curtime->tm_hour);
		}
		else         /*午后的处理*/
		{
			printf("PM ");
			if((float)curtime->tm_hour-12<10)
				printf("0");
			printf("%.0f:",(float)curtime->tm_hour-12);
		}
		if((float)curtime->tm_min<10)
			printf("0");
		printf("%.0f:",(float)curtime->tm_min);
		if((float)curtime->tm_sec<10)
			printf("0");
		printf("%.0f",(float)curtime->tm_sec);
		printf("\n");
		printf("\n");
		printf("\n");
		printf("\n");
		printf("\n");
		printf("\n");
		Sleep(1);      /*延时一秒后刷新*/
		system("cls");
	}while(1);
	char a[512];
    unsigned long size=512;
    GetComputerName(a,&size);
    printf("The computer's name is:/n ");
    printf("%s",a);
    printf("/n");
}
[/code]

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