主函数.txt

一些用到的函数 功能齐全

   closegraph(); 
   return 0; 
} 
  
  

函数名: movemem 
功  能: 移动一块字节 
用  法: void movemem(void *source, void *destin, unsigned len); 
程序例: 

#include <mem.h> 
#include <alloc.h> 
#include <stdio.h> 
#include <string.h> 

int main(void) 
{ 
   char *source = "Borland International"; 
   char *destination; 
   int length; 

   length = strlen(source); 
   destination = malloc(length + 1); 
   movmem(source,destination,length); 
   printf("%s\n",destination); 

   return 0; 
} 
  
  

函数名: normvideo 
功  能: 选择正常亮度字符 
用  法: void normvideo(void); 
程序例: 

#include <conio.h> 

int main(void) 
{ 
   normvideo(); 
   cprintf("NORMAL Intensity Text\r\n"); 
   return 0; 
} 
  
  

函数名: nosound 
功  能: 关闭PC扬声器 
用  法: void nosound(void); 
程序例: 

/* Emits a 7-Hz tone for 10 seconds. 

     True story: 7 Hz is the resonant frequency of a chicken's skull cavity. 
     This was determined empirically in Australia, where a new factory 
     generating 7-Hz tones was located too close to a chicken ranch: 
     When the factory started up, all the chickens died. 

     Your PC may not be able to emit a 7-Hz tone. 
*/ 

int main(void) 
{ 
   sound(7); 
   delay(10000); 
   nosound(); 
} 
  

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版权所有(C) 潇逸天地
Copyright by 潇 逸 1999 
建议用 IE4.0 800*600真彩色浏览本站以达到最好效果
网站制作：潇 逸(周 炜) 
  
函数名: open 
功  能: 打开一个文件用于读或写 
用  法: int open(char *pathname, int access[, int permiss]); 
程序例: 

#include <string.h> 
#include <stdio.h> 
#include <fcntl.h> 
#include <io.h> 

int main(void) 
{ 
   int handle; 
   char msg[] = "Hello world"; 

   if ((handle = open("TEST.$$$", O_CREAT | O_TEXT)) == -1) 
   { 
      perror("Error:"); 
      return 1; 
   } 
   write(handle, msg, strlen(msg)); 
   close(handle); 
   return 0; 
} 
  
  

函数名: outport 
功  能: 输出整数到硬件端口中 
用  法: void outport(int port, int value); 
程序例: 

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

int main(void) 
{ 
   int value = 64; 
   int port = 0; 

   outportb(port, value); 
   printf("Value %d sent to port number %d\n", value, port); 
   return 0; 
} 
  
  

函数名: outportb 
功  能: 输出字节到硬件端口中 
用  法: void outportb(int port, char byte); 
程序例: 

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

int main(void) 
{ 
   int value = 64; 
   int port = 0; 

   outportb(port, value); 
   printf("Value %d sent to port number %d\n", value, port); 
   return 0; 
} 
  
  

函数名: outtext 
功  能: 在视区显示一个字符串 
用  法: void far outtext(char far *textstring); 
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 midx, midy; 

   /* 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; 

   /* move the C.P. to the center of the screen */ 
   moveto(midx, midy); 

   /* output text starting at the C.P. */ 
   outtext("This "); 
   outtext("is "); 
   outtext("a "); 
   outtext("test."); 

   /* clean up */ 
   getch(); 
   closegraph(); 
   return 0; 
} 
  
  

函数名: outtextxy 
功  能: 在指定位置显示一字符串 
用  法: void far outtextxy(int x, int y, char *textstring); 
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 midx, midy; 

   /* 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; 

   /* output text at the center of the screen*/ 
   /* Note: the C.P. doesn't get changed.*/ 
   outtextxy(midx, midy, "This is a test."); 

   /* clean up */ 
   getch(); 
   closegraph(); 
   return 0; 
} 
  

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版权所有(C) 潇逸天地
Copyright by 潇 逸 1999 
建议用 IE4.0 800*600真彩色浏览本站以达到最好效果
网站制作：潇 逸(周 炜) 
  
函数名: parsfnm 
功  能: 分析文件名 
用  法: char *parsfnm (char *cmdline, struct fcb *fcbptr, int option); 
程序例: 

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

int main(void) 
{ 
   char line[80]; 
   struct fcb blk; 

   /* get file name */ 
   printf("Enter drive and file name (no path - ie. a:file.dat)\n"); 
   gets(line); 

   /* put file name in fcb */ 
   if (parsfnm(line, &blk, 1) == NULL) 
      printf("Error in parsfm call\n"); 
   else 
      printf("Drive #%d  Name: %11s\n", blk.fcb_drive, blk.fcb_name); 

   return 0; 
} 
  
  

函数名: peek 
功  能: 检查存储单元 
用  法: int peek(int segment, unsigned offset); 
程序例: 

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

int main(void) 
{ 
   int value = 0; 

   printf("The current status of your keyboard is:\n"); 
   value = peek(0x0040, 0x0017); 
   if (value & 1) 
      printf("Right shift on\n"); 
   else 
      printf("Right shift off\n"); 

   if (value & 2) 
      printf("Left shift on\n"); 
   else 
      printf("Left shift off\n"); 

   if (value & 4) 
      printf("Control key on\n"); 
   else 
      printf("Control key off\n"); 

   if (value & 8) 
      printf("Alt key on\n"); 
   else 
      printf("Alt key off\n"); 

   if (value & 16) 
      printf("Scroll lock on\n"); 
   else 
      printf("Scroll lock off\n"); 

   if (value & 32) 
      printf("Num lock on\n"); 
   else 
      printf("Num lock off\n"); 

   if (value & 64) 
      printf("Caps lock on\n"); 
   else 
      printf("Caps lock off\n"); 

   return 0; 
} 
  
  

函数名: peekb 
功  能: 检查存储单元 
用  法: char peekb (int segment, unsigned offset); 
程序例: 

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

int main(void) 
{ 
   int value = 0; 

   printf("The current status of your keyboard is:\n"); 
   value = peekb(0x0040, 0x0017); 
   if (value & 1) 
      printf("Right shift on\n"); 
   else 
      printf("Right shift off\n"); 

   if (value & 2) 
      printf("Left shift on\n"); 
   else 
      printf("Left shift off\n"); 

   if (value & 4) 
      printf("Control key on\n"); 
   else 
      printf("Control key off\n"); 

   if (value & 8) 
      printf("Alt key on\n"); 
   else 
      printf("Alt key off\n"); 

   if (value & 16) 
      printf("Scroll lock on\n"); 
   else 
      printf("Scroll lock off\n"); 

   if (value & 32) 
      printf("Num lock on\n"); 
   else 
      printf("Num lock off\n"); 

   if (value & 64) 
      printf("Caps lock on\n"); 
   else 
      printf("Caps lock off\n"); 

   return 0; 
} 
  
  

函数名: perror 
功  能: 系统错误信息 
用  法: void perror(char *string); 
程序例: 

#include <stdio.h> 

int main(void) 
{ 
   FILE *fp; 

   fp = fopen("perror.dat", "r"); 
   if (!fp) 
      perror("Unable to open file for reading"); 
   return 0; 
} 
  
  

函数名: pieslice 
功  能: 绘制并填充一个扇形 
用  法: void far pieslice(int x, int stanle, int endangle, int radius); 
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 midx, midy; 
   int stangle = 45, endangle = 135, radius = 100; 

   /* 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; 

   /* set fill style and draw a pie slice */ 
   setfillstyle(EMPTY_FILL, getmaxcolor()); 
   pieslice(midx, midy, stangle, endangle, radius); 

   /* clean up */ 
   getch(); 
   closegraph(); 
   return 0; 
} 
  
  

函数名: poke 
功  能: 存值到一个给定存储单元 
用  法: void poke(int segment, int offset, int value); 
程序例: 

#include <dos.h> 
#include <conio.h> 

int main(void) 
{ 
   clrscr(); 
   cprintf("Make sure the scroll lock key is off and press any key\r\n"); 
   getch(); 
   poke(0x0000,0x0417,16); 
   cprintf("The scroll lock is now on\r\n"); 
   return 0; 
} 
  
  

函数名: pokeb 
功  能: 存值到一个给定存储单元 
用  法: void pokeb(int segment, int offset, char value); 
程序例: 

#include <dos.h> 
#include <conio.h> 

int main(void) 
{ 
   clrscr(); 
   cprintf("Make sure the scroll lock key is off and press any key\r\n"); 
   getch(); 
   pokeb(0x0000,0x0417,16); 
   cprintf("The scroll lock is now on\r\n"); 
   return 0; 
} 
  
  

函数名: poly 
功  能: 根据参数产生一个多项式 
用  法: double poly(double x, int n, double c[]); 
程序例: 

#include <stdio.h> 
#include <math.h> 

/* polynomial:  x**3 - 2x**2 + 5x - 1 */ 

int main(void) 
{ 
   double array[] = { -1.0, 5.0, -2.0, 1.0 }; 
   double result; 

   result = poly(2.0, 3, array); 
   printf("The polynomial: x**3 - 2.0x**2 + 5x - 1 at 2.0 is %lf\n", 
           result); 
   return 0; 
} 
  
  

函数名: pow 
功  能: 指数函数(x的y次方)