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Turbo C 2.0、Borland C++库函数及用例(17) 程序例:#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>/* names of the various cards supported */
char *dname[] = { "requests detection",
"a CGA", "an MCGA",
"an EGA",
"a 64K EGA",
"a monochrome EGA",
"an IBM 8514",
"a Hercules monochrome",
"an AT&T 6300 PC",
"a VGA",
"an IBM 3270 PC"
};int main(void)
{
/* returns detected hardware info. */ int gdriver, gmode, errorcode; /* detect graphics hardware available */
detectgraph(&gdriver, &gmode); /* read result of detectgraph call */
errorcode = graphresult(); if (errorcode != grOk) /* an error
occurred */
{
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:"); getch();
exit(1); /* terminate with an error
code */
} /* display the information detected */
clrscr();
printf("You have %s video display \
card.\n", dname[gdriver]);
printf("Press any key to halt:");
getch();
return 0;
}
函数名: difftime
功 能: 计算两个时刻之间的时间差
用 法: double difftime(time_t time2, time_t time1);
程序例:#include <time.h>
#include <stdio.h>
#include <dos.h>
#include <conio.h>int main(void)
{
time_t first, second;
clrscr();
first = time(NULL); /* Gets system time */ delay(2000); /* Waits 2 secs */
second = time(NULL); /* Gets system time
again */
printf("The difference is: %f \
seconds\n",difftime(second,first));
getch();
return 0;
}
函数名: disable
功 能: 屏蔽中断
用 法: void disable(void);
程序例:/***NOTE: This is an interrupt service
routine. You cannot compile this program
with Test Stack Overflow turned on and
get an executable file that operates
correctly. */#include <stdio.h>
#include <dos.h>
#include <conio.h>#define INTR 0X1C /* The clock tick interrupt */void interrupt ( *oldhandler)(void);int count=0;void interrupt handler(void)
{
/* disable interrupts during the handling of
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