1.txt

本软件是集成式的输入平台

   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: 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)  
用  法: double pow(double x, double y);  
程序例:  

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

int main(void)  
{  
   double x = 2.0, y = 3.0;  

   printf("%lf raised to %lf is %lf\n", x, y, pow(x, y));  
   return 0;  
}  
   

函数名: pow10  
功  能: 指数函数(10的p次方)  
用  法: double pow10(int p);  
程序例:  

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

int main(void)  
{  
   double p = 3.0;  

   printf("Ten raised to %lf is %lf\n", p, pow10(p));  
   return 0;  
}  
   
   

函数名: printf  
功  能: 产生格式化输出的函数  
用  法: int printf(char *format...);  
程序例:  

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

#define I 555  
#define R 5.5  

int main(void)  
{  
   int i,j,k,l;  
   char buf[7];  
   char *prefix = buf;  
   char tp[20];  
   printf("prefix  6d      6o      8x        10.2e        "  
          "10.2f\n");  
   strcpy(prefix,"%");  
   for (i = 0; i < 2; i++)  
   {  
      for (j = 0; j < 2; j++)  
         for (k = 0; k < 2; k++)  
     for (l = 0; l < 2; l++)  
            {  
               if (i==0)  strcat(prefix,"-");  
               if (j==0)  strcat(prefix,"+");  
               if (k==0)  strcat(prefix,"#");  
               if (l==0)  strcat(prefix,"0");  
               printf("%5s |",prefix);  
               strcpy(tp,prefix);  
               strcat(tp,"6d |");  
               printf(tp,I);  
               strcpy(tp,"");  
               strcpy(tp,prefix);  
               strcat(tp,"6o |");  
               printf(tp,I);  
               strcpy(tp,"");  
               strcpy(tp,prefix);  
               strcat(tp,"8x |");  
               printf(tp,I);  
               strcpy(tp,"");  
               strcpy(tp,prefix);  
        strcat(tp,"10.2e |");  
        printf(tp,R);  
        strcpy(tp,prefix);  
        strcat(tp,"10.2f |");  
        printf(tp,R);  
        printf("  \n");  
        strcpy(prefix,"%");  
     }  
       }  
   return 0;  
}  
   
   

函数名: putc  
功  能: 输出一字符到指定流中  
用  法: int putc(int ch, FILE *stream);  
程序例:  

#include <stdio.h>  

int main(void)  
{  
   char msg[] = "Hello world\n";  
   int i = 0;  

   while (msg[i])  
      putc(msg[i++], stdout);  
   return 0;  
}  
   
   

函数名: putch  
功  能: 输出字符到控制台  
用  法: int putch(int ch);  
程序例:  

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

int main(void)  
{  
   char ch = 0;  

   printf("Input a string:");  
   while ((ch != '\r'))  
   {  
      ch = getch();  
      putch(ch);  
   }  
   return 0;  
}  
   
   

函数名: putchar  
功  能: 在stdout上输出字符  
用  法: int putchar(int ch);  
程序例:  

#include <stdio.h>  

/* define some box-drawing characters */  
#define LEFT_TOP  0xDA  
#define RIGHT_TOP 0xBF  
#define HORIZ     0xC4  
#define VERT      0xB3  
#define LEFT_BOT  0xC0  
#define RIGHT_BOT 0xD9  

int main(void)  
{  
   char i, j;  

   /* draw the top of the box */  
   putchar(LEFT_TOP);  
   for (i=0; i<10; i++)  
      putchar(HORIZ);  
   putchar(RIGHT_TOP);  
   putchar('\n');  

   /* draw the middle */  
   for (i=0; i<4; i++)  
   {  
      putchar(VERT);  
      for (j=0; j<10; j++)  
         putchar(' ');  
      putchar(VERT);  
      putchar('\n');  
   }  

   /* draw the bottom */  
   putchar(LEFT_BOT);  
   for (i=0; i<10; i++)  
      putchar(HORIZ);  
   putchar(RIGHT_BOT);  
   putchar('\n');  

   return 0;  
}  
   
   

函数名: putenv  
功  能: 把字符串加到当前环境中  
用  法: int putenv(char *envvar);  
程序例:  

#include <stdio.h>  
#include <stdlib.h>  
#include <alloc.h>  
#include <string.h>  
#include <dos.h>  

int main(void)  
{  
   char *path, *ptr;  
   int i = 0;  

   /* get the current path environment */  
   ptr = getenv("PATH");  

   /* set up new path */  
   path = malloc(strlen(ptr)+15);  
   strcpy(path,"PATH=");  
   strcat(path,ptr);  
   strcat(path,";c:\\temp");  

   /* replace the current path and display current environment */  
   putenv(path);  
   while (environ[i])  
       printf("%s\n",environ[i++]);  

   return 0;  
}  
   
   

函数名: putimage  
功  能: 在屏幕上输出一个位图  
用  法: void far putimage(int x, int y, void far *bitmap, int op);  
程序例:  

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

#define ARROW_SIZE 10  

void draw_arrow(int x, int y);  

int main(void)  
{  
   /* request autodetection */  
   int gdriver = DETECT, gmode, errorcode;  
   void *arrow;  
   int x, y, maxx;  
   unsigned int size;  

   /* 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 */  
   }  

   maxx = getmaxx();  
   x = 0;  
   y = getmaxy() / 2;  

   /* draw the image to be grabbed */  
   draw_arrow(x, y);  

   /* calculate the size of the image */  
   size = imagesize(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE);  

   /* allocate memory to hold the image */  
   arrow = malloc(size);  

   /* grab the image */  
   getimage(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE, arrow);  

   /* repeat until a key is pressed */  
   while (!kbhit())  
   {  
      /* erase old image */  
      putimage(x, y-ARROW_SIZE, arrow, XOR_PUT);  

      x += ARROW_SIZE;  
      if (x >= maxx)  
          x = 0;  

      /* plot new image */  
      putimage(x, y-ARROW_SIZE, arrow, XOR_PUT);  
   }  

   /* clean up */  
   free(arrow);  
   closegraph();  
   return 0;  
}  

void draw_arrow(int x, int y)  
{  
   /* draw an arrow on the screen */  
   moveto(x, y);  
   linerel(4*ARROW_SIZE, 0);  
   linerel(-2*ARROW_SIZE, -1*ARROW_SIZE);  
   linerel(0, 2*ARROW_SIZE);  
   linerel(2*ARROW_SIZE, -1*ARROW_SIZE);  
}  
   
   

函数名: putpixel  
功  能: 在指定位置画一像素  
用  法: void far putpixel (int x, int y, int pixelcolor);  
程序例:  

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

#define PIXEL_COUNT 1000  
#define DELAY_TIME  100  /* in milliseconds */  

int main(void)  
{  
   /* request autodetection */  
   int gdriver = DETECT, gmode, errorcode;  
   int i, x, y, color, maxx, maxy, maxcolor, seed;  

   /* 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 */  
   }  

   maxx = getmaxx() + 1;  
   maxy = getmaxy() + 1;  
   maxcolor = getmaxcolor() + 1;  

   while (!kbhit())  
   {  
      /* seed the random number generator */  
      seed = random(32767);  
      srand(seed);  
      for (i=0; i<PIXEL_COUNT; i++)  
      {  
  x = random(maxx);  
         y = random(maxy);  
         color = random(maxcolor);  
         putpixel(x, y, color);  
      }  

      delay(DELAY_TIME);  
      srand(seed);  
      for (i=0; i<PIXEL_COUNT; i++)  
      {  
  x = random(maxx);  
  y = random(maxy);  
  color = random(maxcolor);  
  if (color == getpixel(x, y))  
     putpixel(x, y, 0);  
      }  
   }  

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

函数名: puts  
功  能: 送一字符串到流中  
用  法: int puts(char *string);  
程序例:  

#include <stdio.h>  
int main(void)  
{  
   char string[] = "This is an example output string\n";  

   puts(string);  
   return 0;  
}  
   
   

函数名: puttext  
功  能: 将文本从存储区拷贝到屏幕  
用  法: int puttext(int left, int top, int right, int bottom, void *source);  
程序例:  

#include <conio.h>  
int main(void)  
{  
   char buffer[512];  

   /* put some text to the console */  
   clrscr();  
   gotoxy(20, 12);  
   cprintf("This is a test.  Press any key to continue ...");  
   getch();  

   /* grab screen contents */  
   gettext(20, 12, 36, 21,buffer);  
   clrscr();  

   /* put selected characters back to the screen */  
   gotoxy(20, 12);  
   puttext(20, 12, 36, 21, buffer);  
   getch();  

   return 0;  
}  
   
   

函数名: putw  
功  能: 把一字符或字送到流中  
用  法: int putw(int w, FILE *stream);  
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;  
}   

--------------------------------------------------------------------------------
 
 
 
C语言库函数(Q类字母) 
本文出自: 作者: (2001-10-25 08:00:03) 
    
函数名: qsort 
功  能: 使用快速排序例程进行排序 
用  法: void qsort(void *base, int nelem, int width, int (*fcmp)()); 
程序例:  
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h>  

int sort_function( const void *a, const void *b);  

char list[5][4] = { "cat", "car", "cab", "cap", "can" }; 
   

int main(void) 
{ 
   int  x;  

   qsort((void *)list, 5, sizeof(list[0]), sort_function); 
   for (x = 0; x < 5; x++) 
      printf("%s\n", list[x]); 
   return 0; 
}  

int sort_function( const void *a, const void *b) 
{ 
   return( strcmp(a,b) ); 
} 
   

--------------------------------------------------------------------------------
 
 
 
C语言库函数(R类字母) 
本文出自: 作者: (2001-10-25 09:00:01) 

函数名: raise  
功  能: 向正在执行的程序发送一个信号  
用  法: int raise(int sig);  
程序例:  

#include <signal.h>  

int main(void)  
{  
   int a, b;  

   a = 10;  
   b = 0;  
   if (b == 0)  
   /* preempt divide by zero error */  
      raise(SIGFPE);  
   a = a / b;  
   return 0;  
}  
   
   

函数名: rand  
功  能: 随机数发生器  
用  法: void rand(void);  
程序例:  

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

int main(void)  
{  
   int i;  

   printf("Ten random numbers from 0 to 99\n\n");  
   for(i=0; i<10; i++)  
      printf("%d\n", rand() % 100);  
   return 0;  
}  
   
   

函数名: randbrd  
功  能: 随机块读  
用  法: int randbrd(struct fcb *fcbptr, int reccnt);  
程序例:  

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

int main(void)  
{  
   char far *save_dta;  
   char line[80], buffer[256];  
   struct fcb blk;  
   int i, result;  

   /* get user input file name for dta */  
   printf("Enter drive and file name (no path - i.e. a:file.dat)\n");  
   gets(line);  

   /* put file name in fcb */  
   if (!parsfnm(line, &blk, 1))  
   {  
      printf("Error in call to parsfnm\n");  
      exit(1);  
   }  
   printf("Drive #%d  File: %s\n\n", blk.fcb_drive, blk.fcb_name);  

   /* open file with DOS FCB open file */  
   bdosptr(0x0F, &blk, 0);  

   /* save old dta, and set new one */  
   save_dta = getdta();  
   setdta(buffer);  

   /* set up info for the new dta */  
   blk.fcb_recsize = 128;  
   blk.fcb_random = 0L;  
   result = randbrd(&blk, 1);  

   /* check results from randbrd */  
   if (!result)  
      printf("Read OK\n\n");  
   else  
   {  
      perror("Error during read");  
      exit(1);  
   }  

   /* read in data from the new dta */  
   printf("The first 128 characters are:\n");  
   for (i=0; i<128; i++)  
      putchar(buffer[i]);  

   /* restore previous dta */  
   setdta(save_dta);  

   return 0;  
}  
   

函数名: randbwr  
功  能: 随机块写  
用  法: int randbwr(struct fcp *fcbptr, int reccnt);  
程序例:  

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

int main(void)  
{  
   char far *save_dta;  
   char line[80];  
   char buffer[256] = "RANDBWR test!";  
   struct fcb blk;  
   int result;  

   /* get new file name from