Turboc2.0函数大全.zip

   stat = chmod(filename, S_IREAD); 
   if (stat) 
      printf("Couldn't make %s read-only\n", filename); 
   else 
      printf("Made %s read-only\n", filename); 
} 
  
  
  

函数名: chsize 
功  能: 改变文件大小 
用  法: int chsize(int handle, long size); 
程序例: 

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

int main(void) 
{ 
   int handle; 
   char buf[11] = "0123456789"; 

   /* create text file containing 10 bytes */ 
   handle = open("DUMMY.FIL", O_CREAT); 
   write(handle, buf, strlen(buf)); 

   /* truncate the file to 5 bytes in size */ 
   chsize(handle, 5); 

   /* close the file */ 
   close(handle); 
   return 0; 
} 
  
  

函数名: circle 
功  能: 在给定半径以(x, y)为圆心画圆 
用  法: void far circle(int x, int y, 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 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; 
   setcolor(getmaxcolor()); 

   /* draw the circle */ 
   circle(midx, midy, radius); 

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

函数名: cleardevice 
功  能: 清除图形屏幕 
用  法: void far cleardevice(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 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; 
   setcolor(getmaxcolor()); 

   /* for centering screen messages */ 
   settextjustify(CENTER_TEXT, CENTER_TEXT); 

   /* output a message to the screen */ 
   outtextxy(midx, midy, "press any key to clear the screen:"); 

   /* wait for a key */ 
   getch(); 

   /* clear the screen */ 
   cleardevice(); 

   /* output another message */ 
   outtextxy(midx, midy, "press any key to quit:"); 

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

函数名: clearerr 
功  能: 复位错误标志 
用  法:void clearerr(FILE *stream); 
程序例: 

#include <stdio.h> 

int main(void) 
{ 
   FILE *fp; 
   char ch; 

   /* open a file for writing */ 
   fp = fopen("DUMMY.FIL", "w"); 

   /* force an error condition by attempting to read */ 
   ch = fgetc(fp); 
   printf("%c\n",ch); 

   if (ferror(fp)) 
   { 
      /* display an error message */ 
      printf("Error reading from DUMMY.FIL\n"); 

      /* reset the error and EOF indicators */ 
      clearerr(fp); 
   } 

   fclose(fp); 
   return 0; 
} 
  
  
  

函数名: clearviewport 
功  能: 清除图形视区 
用  法: void far clearviewport(void); 
程序例: 

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

#define CLIP_ON 1   /* activates clipping in viewport */ 

int main(void) 
{ 
   /* request auto detection */ 
   int gdriver = DETECT, gmode, errorcode; 
   int ht; 

   /* 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 */ 
   } 

   setcolor(getmaxcolor()); 
   ht = textheight("W"); 

   /* message in default full-screen viewport */ 
   outtextxy(0, 0, "* <-- (0, 0) in default viewport"); 

   /* create a smaller viewport */ 
   setviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON); 

   /* display some messages */ 
   outtextxy(0, 0, "* <-- (0, 0) in smaller viewport"); 
   outtextxy(0, 2*ht, "Press any key to clear viewport:"); 

   /* wait for a key */ 
   getch(); 

   /* clear the viewport */ 
   clearviewport(); 

   /* output another message */ 
   outtextxy(0, 0, "Press any key to quit:"); 

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

函数名: _close, close 
功  能: 关闭文件句柄 
用  法: int close(int handle); 
程序例: 

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

main() 
{ 
   int handle; 
   char buf[11] = "0123456789"; 

   /* create a file containing 10 bytes */ 
   handle = open("NEW.FIL", O_CREAT); 
   if (handle > -1) 
   { 
       write(handle, buf, strlen(buf)); 

       /* close the file */ 
       close(handle); 
   } 
   else 
   { 
       printf("Error opening file\n"); 
   } 
   return 0; 
} 
  
  
  

函数名: clock 
功  能: 确定处理器时间 
用  法: clock_t clock(void); 
程序例: 

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

int main(void) 
{ 
   clock_t start, end; 
   start = clock(); 

   delay(2000); 

   end = clock(); 
   printf("The time was: %f\n", (end - start) / CLK_TCK); 

   return 0; 
} 
  
  
  

函数名: closegraph 
功  能: 关闭图形系统 
用  法: void far closegraph(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 x, y; 

   /* initialize graphics mode */ 
   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 */ 
   } 

   x = getmaxx() / 2; 
   y = getmaxy() / 2; 

   /* output a message */ 
   settextjustify(CENTER_TEXT, CENTER_TEXT); 
   outtextxy(x, y, "Press a key to close the graphics system:"); 

   /* wait for a key */ 
   getch(); 

   /* closes down the graphics system */ 
   closegraph(); 

   printf("We're now back in text mode.\n"); 
   printf("Press any key to halt:"); 
   getch(); 
   return 0; 
} 
  
  
  

函数名: clreol 
功  能: 在文本窗口中清除字符到行末 
用  法: void clreol(void); 
程序例: 

#include <conio.h> 

int main(void) 

{ 
   clrscr(); 
   cprintf("The function CLREOL clears all characters from the\r\n"); 
   cprintf("cursor position to the end of the line within the\r\n"); 
   cprintf("current text window, without moving the cursor.\r\n"); 
   cprintf("Press any key to continue . . ."); 
   gotoxy(14, 4); 
   getch(); 

   clreol(); 
   getch(); 

   return 0; 
} 
  
  
  

函数名: clrscr 
功  能: 清除文本模式窗口 
用  法: void clrscr(void); 
程序例: 

#include <conio.h> 

int main(void) 
{ 
   int i; 

   clrscr(); 
   for (i = 0; i < 20; i++) 
      cprintf("%d\r\n", i); 
   cprintf("\r\nPress any key to clear screen"); 
   getch(); 

   clrscr(); 
   cprintf("The screen has been cleared!"); 
   getch(); 

   return 0; 
} 
  
  
  

函数名: coreleft 
功  能: 返回未使用内存的大小 
用  法: unsigned coreleft(void); 
程序例: 

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

int main(void) 
{ 
   printf("The difference between the highest allocated block and\n"); 
   printf("the top of the heap is: %lu bytes\n", (unsigned long) coreleft()); 

   return 0; 
} 
  

函数名: cos 
功  能: 余弦函数 
用  法: double cos(double x); 
程序例: 

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

int main(void) 
{ 
   double result; 
   double x = 0.5; 

   result = cos(x); 
   printf("The cosine of %lf is %lf\n", x, result); 
   return 0; 
} 
  
  
  

函数名: cosh 
功  能: 双曲余弦函数 
用  法: dluble cosh(double x); 
程序例: 

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

int main(void) 
{ 
   double result; 
   double x = 0.5; 

   result = cosh(x); 
   printf("The hyperboic cosine of %lf is %lf\n", x, result); 
   return 0; 
} 
  
  
  

函数名: country 
功  能: 返回与国家有关的信息 
用  法: struct COUNTRY *country(int countrycode, struct country *country); 
程序例: 

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

#define USA 0 

int main(void) 
{ 
   struct COUNTRY country_info; 

   country(USA, &country_info); 
   printf("The currency symbol for the USA is: %s\n", 
           country_info.co_curr); 
   return 0; 
} 
  
  
  

函数名: cprintf 
功  能: 送格式化输出至屏幕 
用  法: int cprintf(const char *format[, argument, ...]); 
程序例: 

#include <conio.h> 

int main(void) 
{ 
   /* clear the screen */ 
   clrscr(); 

   /* create a text window */ 
   window(10, 10, 80, 25); 

   /* output some text in the window */ 
   cprintf("Hello world\r\n"); 

   /* wait for a key */ 
   getch(); 
   return 0; 
} 
  
  
  

函数名: cputs 
功  能: 写字符到屏幕 
用  法: void cputs(const char *string); 
程序例: 

#include <conio.h> 

int main(void) 
{ 
   /* clear the screen */ 
   clrscr(); 

   /* create a text window */ 
   window(10, 10, 80, 25); 

   /* output some text in the window */ 
   cputs("This is within the window\r\n"); 

   /* wait for a key */ 
   getch(); 
   return 0; 
} 
  
  
  

函数名: _creat  creat 
功  能: 创建一个新文件或重写一个已存在的文件 
用  法: int creat (const char *filename, int permiss); 
程序例: 

#include <sys\stat.h> 
#include <string.h> 
#include <fcntl.h> 
#include <io.h> 

int main(void) 
{ 
   int handle; 
   char buf[11] = "0123456789"; 

   /* change the default file mode from text to binary */ 
   _fmode = O_BINARY; 

   /* create a binary file for reading and writing */ 
   handle = creat("DUMMY.FIL", S_IREAD | S_IWRITE); 

   /* write 10 bytes to the file */ 
   write(handle, buf, strlen(buf)); 

   /* close the file */ 
   close(handle); 
   return 0; 
} 
  

函数名: creatnew 
功  能: 创建一个新文件 
用  法: int creatnew(const char *filename, int attrib); 
程序例: 

#include <string.h> 
#include <stdio.h> 
#include <errno.h> 
#include <dos.h> 
#include <io.h> 

int main(void) 
{ 
   int handle; 
   char buf[11] = "0123456789"; 

   /* attempt to create a file that doesn't already exist */ 
   handle = creatnew("DUMMY.FIL", 0);