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Turbo C 2.0、Borland C++库函数及用例(18) the interrupt */
disable();
/* increase the global counter */
count++;/* reenable interrupts at the end of the
handler */
enable();
/* call the old routine */
oldhandler();
}int main(void)
{
/* save the old interrupt vector */
oldhandler = getvect(INTR);/* install the new interrupt handler */
setvect(INTR, handler);/* loop until the counter exceeds 20 */
while (count < 20)
printf("count is %d\n",count);/* reset the old interrupt handler */
setvect(INTR, oldhandler); return 0;
}
函数名: div
功 能: 将两个整数相除, 返回商和余数
用 法: div_t (int number, int denom);
程序例:
#include <stdlib.h>
#include <stdio.h>
div_t x;int main(void)
{
x = div(10,3);
printf("10 div 3 = %d remainder %d\n", x.quot, x.rem);
return 0;
}
函数名: dosexterr
功 能: 获取扩展DOS错误信息
用 法: int dosexterr(struct DOSERR *dblkp);
程序例:#include <stdio.h>
#include <dos.h>int main(void)
{
FILE *fp;
struct DOSERROR info; fp = fopen("perror.dat","r"); if (!fp) perror("Unable to open file for
reading");
dosexterr(&info); printf("Extended DOS error \
information:\n");
printf(" Extended error: \
%d\n",info.exterror);
printf(" Class: \
%x\n",info.class);
printf(" Action: \
%x\n",info.action);
printf(" Error Locus: \
%x\n",info.locus); return 0;
}
函数名: dostoUnix
功 能: 转换日期和时间为UNIX时间格式
用 法: long dostounix( struct date *dateptr,
struct time *timeptr );
程序例: #include <time.h>
#include <stddef.h>
#include <dos.h>
#include <stdio.h> int main(void)
{
time_t t; struct time d_time;
struct date d_date;
struct tm *local; getdate(&d_date);
gettime(&d_time); t = dostounix(&d_date, &d_time);
local = localtime(&t);
printf("Time and Date: %s\n", asctime(local));
return 0;
}
函数名: drawpoly
功 能: 画多边形
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