C语言的函数!

内财数模协会 · 发表于 2004-5-8 17:48:58

<

>函数名: getvect
功能: 取得中断向量入口
用法: void interrupt(*getvect(int intr_num));
程序例: <

>#include <stdio.h>
#include <dos.h> <

>void interrupt get_out(); /* interrupt prototype */ void interrupt (*oldfunc)(); /* interrupt function pointer */
int looping = 1; int main(void)
{
 puts("Press <Shift><Prt Sc> to terminate"); /* save the old interrupt */
 oldfunc = getvect(5); /* install interrupt handler */
 setvect(5,get_out); /* do nothing */
 while (looping); /* restore to original interrupt routine */
setvect(5,oldfunc); puts("Success");
 return 0;
}
void interrupt get_out()
{
 looping = 0; /* change global variable to get out of loop */
}

内财数模协会 · 发表于 2004-5-8 17:49:07

<

>函数名: getverify
功能: 返回DOS校验标志状态
用法: int getverify(void);
程序例: <

>#include <stdio.h>
#include <dos.h> <

>int main(void)
{
if (getverify())
printf("DOS verify flag is on\n");
else
printf("DOS verify flag is off\n");
return 0;
}

内财数模协会 · 发表于 2004-5-8 17:49:17

<

>函数名: getviewsetting
功能: 返回有关当前视区的信息
用法: void far getviewsettings(struct viewporttype far *viewport);
程序例: <

>#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h> <

>char *clip[] = { "OFF", "ON" }; int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
struct viewporttype viewinfo;
int midx, midy, ht;
char topstr[80], botstr[80], clipstr[80]; /* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); /* read result of initialization */
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 */
} midx = getmaxx() / 2;
midy = getmaxy() / 2; /* get information about current viewport */
getviewsettings(&viewinfo); /* convert text information into strings */
sprintf(topstr, "(%d, %d) is the upper left viewport corner.",
 viewinfo.left, viewinfo.top);
sprintf(botstr, "(%d, %d) is the lower right viewport corner.",
 viewinfo.right, viewinfo.bottom);
sprintf(clipstr, "Clipping is turned %s.", clip[viewinfo.clip]); /* display the information */
settextjustify(CENTER_TEXT, CENTER_TEXT);
ht = textheight("W");
outtextxy(midx, midy, topstr);
outtextxy(midx, midy+2*ht, botstr);
outtextxy(midx, midy+4*ht, clipstr); /* clean up */
getch();
closegraph();
return 0;
}

内财数模协会 · 发表于 2004-5-8 17:49:26

<

>函数名: getw
功能: 从流中取一整数
用法: int getw(FILE *strem);
程序例: <

>#include <stdio.h>
#include <stdlib.h> <

>#define FNAME "test.$$$" int main(void)
{
FILE *fp;
int word; /* place the word in a file */
fp = fopen(FNAME, "wb");
if (fp == NULL)
{
 printf("Error opening file %s\n", FNAME);
 exit(1);
} word = 94;
putw(word,fp);
if (ferror(fp))
 printf("Error writing to file\n");
else
 printf("Successful write\n");
fclose(fp); /* reopen the file */
fp = fopen(FNAME, "rb");
if (fp == NULL)
{
 printf("Error opening file %s\n", FNAME);
 exit(1);
} /* extract the word */
word = getw(fp);
if (ferror(fp))
 printf("Error reading file\n");
else
 printf("Successful read: word = %d\n", word); /* clean up */
fclose(fp);
unlink(FNAME); return 0;
}

内财数模协会 · 发表于 2004-5-8 17:49:37

<

>函数名: getx
功能: 返回当前图形位置的x坐标
用法: int far getx(void);
程序例: <

>#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h> <

>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
char msg[80]; /* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); /* read result of initialization */
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 */
} /* move to the screen center point */
moveto(getmaxx() / 2, getmaxy() / 2); /* create a message string */
sprintf(msg, "<-(%d, %d) is the here.", getx(), gety()); /* display the message */
outtext(msg); /* clean up */
getch();
closegraph();
return 0;
}

内财数模协会 · 发表于 2004-5-8 17:49:48

<

>函数名: gety
功能: 返回当前图形位置的y坐标
用法: int far gety(void);
程序例: <

>#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h> <

>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
char msg[80]; /* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); /* read result of initialization */
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 */
} /* move to the screen center point */
moveto(getmaxx() / 2, getmaxy() / 2); /* create a message string */
sprintf(msg, "<-(%d, %d) is the here.", getx(), gety()); /* display the message */
outtext(msg); /* clean up */
getch();
closegraph();
return 0;
}

内财数模协会 · 发表于 2004-5-8 17:49:59

<

>函数名: gmtime
功能: 把日期和时间转换为格林尼治标准时间(GMT)
用法: struct tm *gmtime(long *clock);
程序例: <

>#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <dos.h> <

>/* Pacific Standard Time & Daylight Savings */
char *tzstr = "TZ=PST8PDT"; int main(void)
{
time_t t;
struct tm *gmt, *area; putenv(tzstr);
tzset(); t = time(NULL);
area = localtime(&t);
printf("Local time is: %s", asctime(area));
gmt = gmtime(&t);
printf("GMT is: %s", asctime(gmt));
return 0;
}

内财数模协会 · 发表于 2004-5-8 17:50:08

<

>函数名: gotoxy
功能: 在文本窗口中设置光标
用法: void gotoxy(int x, int y);
程序例: <

>#include <conio.h> <

>int main(void)
{
clrscr();
gotoxy(35, 12);
cprintf("Hello world");
getch();
return 0;
}

内财数模协会 · 发表于 2004-5-8 17:52:17

<

>函数名: gotoxy
功能: 在文本窗口中设置光标
用法: void gotoxy(int x, int y);
程序例: <

>#include <conio.h> <

>int main(void)
{
clrscr();
gotoxy(35, 12);
cprintf("Hello world");
getch();
return 0;
}

内财数模协会 · 发表于 2004-5-8 17:52:29

<

>函数名: graphdefaults
功能: 将所有图形设置复位为它们的缺省值
用法: void far graphdefaults(void);
程序例: <

>#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h> <

>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int maxx, maxy; /* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "c:\\bor\\Borland\\bgi"); /* read result of initialization */
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 */
} maxx = getmaxx();
maxy = getmaxy(); /* output line with non-default settings */
setlinestyle(DOTTED_LINE, 0, 3);
line(0, 0, maxx, maxy);
outtextxy(maxx/2, maxy/3, "Before default values are restored.");
getch(); /* restore default values for everything */
graphdefaults(); /* clear the screen */
cleardevice(); /* output line with default settings */
line(0, 0, maxx, maxy);
outtextxy(maxx/2, maxy/3, "After restoring default values."); /* clean up */
getch();
closegraph();
return 0;
}

		自动登录	找回密码
密码			注-册-帐-号