1.txt

原代码泄露? 用webclass 来做

      bios_time = biostime(0, 0L); 

       gotoxy(50, 1); 

      cprintf("%lu", bios_time); 

       gotoxy(50, 2); 

      cprintf("%.4f", bios_time / CLK_TCK); 

       gotoxy(50, 3); 

      cprintf("%.4f", bios_time / CLK_TCK / 60); 

       gotoxy(50, 4); 

      cprintf("%.4f", bios_time / CLK_TCK / 3600); 

   } 

   return 0; 

} 
{  printf("Calling abort()\n"); 

  abort(); 

  return 0; /* This is never reached */ 

}

 

{  int number = -1234; 

  printf("number: %d  absolute value: %d\n", number, abs(number)); 

  return 0; 

} 


/* absread example */ 

 

i
{ int i, strt, ch_out, sector; 

  char buf[512]; 

 printf("Insert a diskette into drive A and press any key\n"); 

  getch(); 

  sector = 0; 

  if (absread(0, 1, sector, &buf) != 0) 

  {

     perror("Disk problem"); 

     exit(1); 

  } 

  printf("Read OK\n"); 

  strt = 3; 

  for (i=0; i<80; i++) 

  { 

     ch_out = buf[strt+i]; 

     putchar(ch_out); 

  } 

  printf("\n"); 

  return(0); 

}

函数名: access 

功  能: 确定文件的访问权限 

用  法: int access(const char *filename, int amode); 

程序例: 

#include <stdio.h> 

#include <io.h> 

 

int file_exists(char *filename); 

int main(void) 

{  printf("Does NOTEXIST.FIL exist: %s\n", 

  file_exists("NOTEXISTS.FIL") ? "YES" : "NO"); 

  return 0; 

}

int file_exists(char *filename) 

{  return (access(filename, 0) == 0); 

} 

函数名: acos 

功  能: 反余弦函数 

用  法: double acos(double x); 

程序例: 

#include <stdio.h> 

#include <math.h> 

int main(void) 

{ 

  double result; 

  double x = 0.5; 

  result = acos(x); 

 printf("The arc cosine of %lf is %lf\n", x, result); 

  return 0; 

}

函数名: allocmem 

功  能: 分配DOS存储段 

用  法: int allocmem(unsigned size, unsigned *seg); 

程序例: 

#include <dos.h> 

#include <alloc.h> 

#include <stdio.h> 

int main(void) 

{ unsigned int size, segp; 

  int stat; 

 size = 64; /* (64 x 16) = 1024 bytes */ 

  stat = allocmem(size, &segp); 

  if (stat == -1) 

     printf("Allocated memory at segment: %x\n", segp); 

  else 

     printf("Failed: maximum number of paragraphs available is %u\n", 

            stat); 

 

  return 0; 

} 

函数名: arc 

功  能: 画一弧线 

用  法: void far arc(int x, int y, int stangle, 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; 

   int radius = 100; 

 

   /* initialize graphics and local variables */ 

   initgraph(&gdriver, &gmode, ""); 

 

   /* read result of initialization */ 

   errorcode = graphresult();    /* an error occurred */ 

   if (errorcode != grOk) 

   { 

      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 arc */ 

   arc(midx, midy, stangle, endangle, radius); 

   /* clean up */ 

   getch(); 

   closegraph(); 

   return 0; 

}

函数名: asctime 

功  能: 转换日期和时间为ASCII码 

用  法: char *asctime(const struct tm *tblock); 

程序例: 

#include <stdio.h> 

#include <string.h> 

#include <time.h> 

int main(void) 

{    struct tm t; 

   char str[80]; 

   /* sample loading of tm structure  */ 

   t.tm_sec    = 1;  /* Seconds */ 

   t.tm_min    = 30; /* Minutes */ 

   t.tm_hour   = 9;  /* Hour */ 

   t.tm_mday   = 22; /* Day of the Month  */ 

   t.tm_mon    = 11; /* Month */ 

   t.tm_year   = 56; /* Year - does not include century */ 

   t.tm_wday   = 4;  /* Day of the week  */ 

   t.tm_yday   = 0;  /* Does not show in asctime  */ 

   t.tm_isdst  = 0;  /* Is Daylight SavTime; does not show in asctime */ 

 

   /* converts structure to null terminated 

   string */ 

 

   strcpy(str, asctime(&t)); 

   printf("%s\n", str); 

 

   return 0; 

}

函数名: asin 

功  能: 反正弦函数 

用  法: double asin(double x); 

程序例: 

#include <stdio.h> 

#include <math.h> 

 

int main(void) 

{ 

   double result; 

   double x = 0.5; 

 

   result = asin(x); 

   printf("The arc sin of %lf is %lf\n", x, result); 

   return(0); 

}

函数名: assert 

功  能: 测试一个条件并可能使程序终止 

用  法: void assert(int test); 

程序例: 

#include <assert.h> 

#include <stdio.h> 

#include <stdlib.h> 

 

struct ITEM { 

   int key; 

   int value; 

}; 

 

/* add item to list, make sure list is not null */ 

void additem(struct ITEM *itemptr) { 

   assert(itemptr != NULL); 

   /* add item to list */ 

} 

 

int main(void) 

{ 

   additem(NULL); 

   return 0; 

}

函数名: atan 

功  能: 反正切函数 

用  法: double atan(double x); 

程序例: 

#include <stdio.h> 

#include <math.h> 

 

int main(void) 

{ 

   double result; 

   double x = 0.5; 

 

   result = atan(x); 

   printf("The arc tangent of %lf is %lf\n", x, result); 

   return(0); 

}

函数名: atan2 

功  能: 计算Y/X的反正切值 

用  法: double atan2(double y, double x); 

程序例: 

#include <stdio.h> 

#include <math.h> 

 

int main(void) 

{ 

   double result; 

   double x = 90.0, y = 45.0; 

 

   result = atan2(y, x); 

   printf("The arc tangent ratio of %lf is %lf\n", (y / x), result); 

   return 0; 

}

函数名: atexit 

功  能: 注册终止函数 

用  法: int atexit(atexit_t func); 

程序例: 

#include <stdio.h> 

#include <stdlib.h> 

 

void exit_fn1(void) 

{ 

   printf("Exit function #1 called\n"); 

} 

 

void exit_fn2(void) 

{ 

   printf("Exit function #2 called\n"); 

} 

 

int main(void) 

{ 

   /* post exit function #1 */ 

   atexit(exit_fn1); 

   /* post exit function #2 */ 

   atexit(exit_fn2); 

   return 0; 

}  

 

函数名: atof 

功  能: 把字符串转换成浮点数 

用  法: double atof(const char *nptr); 

程序例: 

#include <stdlib.h> 

#include <stdio.h> 

 

int main(void) 

{ 

   float f; 

   char *str = "12345.67"; 

 

   f = atof(str); 

   printf("string = %s float = %f\n", str, f); 

   return 0; 

}

函数名: atoi 

功  能: 把字符串转换成长整型数 

用  法: int atoi(const char *nptr); 

程序例: 

#include <stdlib.h> 

#include <stdio.h> 

 

int main(void) 

{ 

   int n; 

   char *str = "12345.67"; 

 

   n = atoi(str); 

   printf("string = %s integer = %d\n", str, n); 

   return 0; 

}

函数名: atol 

功  能: 把字符串转换成长整型数 

用  法: long atol(const char *nptr); 

程序例: 
#include <stdlib.h> 

#include <stdio.h> 

int main(void) 

{ 
 long l; 
   char *str = "98765432";
   l = atol(lstr); 

   printf("string = %s integer = %ld\n", str, l); 

   return(0); 
}
---------------------------------------------------------------------------
 函数名: bar 

功  能: 画一个二维条形图 

用  法: void far bar(int left, int top, int right, int bottom); 

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, i; 
 /* 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; 

/* loop through the fill patterns */ 

   for (i=SOLID_FILL; i<USER_FILL; i++) 

   { 

      /* set the fill style */ 

      setfillstyle(i, getmaxcolor()); 

 /* draw the bar */ 

      bar(midx-50, midy-50, midx+50, 

         midy+50); 

  getch(); 

   } 

   /* clean up */ 

   closegraph(); 

   return 0; 

}

函数名: bar3d 

功  能: 画一个三维条形图 

用  法: void far bar3d(int left, int top, int right, int bottom, 

                       int depth, int topflag); 
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, i; 

   /* initialize graphics, 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 error code */ 

   } 

   midx = getmaxx() / 2; 

   midy = getmaxy() / 2; 

   /* loop through the fill patterns */ 

   for (i=EMPTY_FILL; i<USER_FILL; i++) 

   { 

      /* set the fill style */ 

      setfillstyle(i, getmaxcolor()); 

      /* draw the 3-d bar */ 

      bar3d(midx-50, midy-50, midx+50, midy+50, 10, 1); 

      getch(); 

   } 

    /* clean up */ 

   closegraph(); 

   return 0; 

} 

函数名: bdos 

功  能: DOS系统调用 

用  法: int bdos(int dosfun, unsigned dosdx, unsigned dosal); 

程序例: 

#include <stdio.h> 

#include <dos.h> 

/* Get current drive as 'A', 'B', ... */ 

char current_drive(void) 

{ 

   char curdrive; 

    /* Get current disk as 0, 1, ... */ 

   curdrive = bdos(0x19, 0, 0); 

   return('A' + curdrive); 

} 

int main(void) 

{