c语言库函数(s类字母) - 2.txt

C语言库函数合集

函数名: setjmp  
功  能: 非局部转移  
用  法: int setjmp(jmp_buf env);  
程序例:  

#include <stdio.h>  
#include <process.h>  
#include <setjmp.h>  

void subroutine(void);  

jmp_buf jumper;  

int main(void)  
{  
   int value;  

   value = setjmp(jumper);  
   if (value != 0)  
   {  
      printf("Longjmp with value %d\n", value);  
      exit(value);  
   }  
   printf("About to call subroutine ... \n");  
   subroutine();  
   return 0;  
}  

void subroutine(void)  
{  
   longjmp(jumper,1);  
}  
   
   

函数名: setlinestyle  
功  能: 设置当前画线宽度和类型  
用  法: void far setlinestyle(int linestype, unsigned upattern);  
程序例:  

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

/* the names of the line styles supported */  
char *lname[] = {  
   "SOLID_LINE",  
   "DOTTED_LINE",  
   "CENTER_LINE",  
   "DASHED_LINE",  
   "USERBIT_LINE"  
   };  

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

   int style, midx, midy, userpat;  
   char stylestr[40];  

   /* 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;  

   /* a user defined line pattern */  
   /* binary: "0000000000000001"  */  
   userpat = 1;  

   for (style=SOLID_LINE; style<=USERBIT_LINE; style++)  
   {  
      /* select the line style */  
      setlinestyle(style, userpat, 1);  

      /* convert style into a string */  
      strcpy(stylestr, lname[style]);  

      /* draw a line */  
      line(0, 0, midx-10, midy);  

      /* draw a rectangle */  
      rectangle(0, 0, getmaxx(), getmaxy());  

      /* output a message */  
      outtextxy(midx, midy, stylestr);  

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

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

函数名: setmem  
功  能: 存值到存储区  
用  法: void setmem(void *addr, int len, char value);  
程序例:  

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

int main(void)  
{  
   char *dest;  

   dest = calloc(21, sizeof(char));  
   setmem(dest, 20, 'c');  
   printf("%s\n", dest);  

   return 0;  
}  
   
   
   

函数名: setmode  
功  能: 设置打开文件方式  
用  法: int setmode(int handle, unsigned mode);  
程序例:  

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

int main(void)  
{  
   int result;  

   result = setmode(fileno(stdprn), O_TEXT);  
   if (result == -1)  
      perror("Mode not available\n");  
   else  
      printf("Mode successfully switched\n");  
   return 0;  
}  
   
   
   

函数名: setpalette  
功  能: 改变调色板的颜色  
用  法: void far setpalette(int index, int actural_color);  
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 color, maxcolor, ht;  
   int y = 10;  
   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 */  
   }  

   maxcolor = getmaxcolor();  
   ht = 2 * textheight("W");  

   /* display the default colors */  
   for (color=1; color<=maxcolor; color++)  
   {  
      setcolor(color);  
      sprintf(msg, "Color: %d", color);  
      outtextxy(1, y, msg);  
      y += ht;  
   }  

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

   /* black out the colors one by one */  
   for (color=1; color<=maxcolor; color++)  
   {  
      setpalette(color, BLACK);  
      getch();  
   }  

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

函数名: setrgbpalette  
功  能: 定义IBM8514图形卡的颜色  
用  法: void far setrgbpalette(int colornum, int red, int green, int blue);  
程序例:  

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

int main(void)  
{  
   /* select a driver and mode that supports the use */  
   /* of the setrgbpalette function.                 */  
   int gdriver = VGA, gmode = VGAHI, errorcode;  
   struct palettetype pal;  
   int i, ht, y, xmax;  

   /* 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 */  
   }  

   /* grab a copy of the palette */  
   getpalette(&pal);  

   /* create gray scale */  
   for (i=0; i<pal.size; i++)  
      setrgbpalette(pal.colors[i], i*4, i*4, i*4);  

   /* display the gray scale */  
   ht = getmaxy() / 16;  
   xmax = getmaxx();  
   y = 0;  
   for (i=0; i<pal.size; i++)  
   {  
      setfillstyle(SOLID_FILL, i);  
      bar(0, y, xmax, y+ht);  
      y += ht;  
   }  

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

函数名: settextjustify  
功  能: 为图形函数设置文本的对齐方式  
用  法: void far settextjustify(int horiz, int vert);  
程序例:  

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

/* function prototype */  
void xat(int x, int y);  

/* horizontal text justification settings */  
char *hjust[] = { "LEFT_TEXT",  
                  "CENTER_TEXT",  
                  "RIGHT_TEXT"  
                };  

/* vertical text justification settings */  
char *vjust[] = { "LEFT_TEXT",  
    "CENTER_TEXT",  
    "RIGHT_TEXT"  
                };  

int main(void)  
{  
   /* request auto detection */  
   int gdriver = DETECT, gmode, errorcode;  
   int midx, midy, hj, vj;  
   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 */  
   }  

   midx = getmaxx() / 2;  
   midy = getmaxy() / 2;  

   /* loop through text justifications */  
   for (hj=LEFT_TEXT; hj<=RIGHT_TEXT; hj++)  
      for (vj=LEFT_TEXT; vj<=RIGHT_TEXT; vj++)  
      {  
         cleardevice();  
         /* set the text justification */  
         settextjustify(hj, vj);  

         /* create a message string */  
         sprintf(msg, "%s  %s", hjust[hj], vjust[vj]);  

  /* create cross hairs on the screen */  
  xat(midx, midy);  

         /* output the message */  
         outtextxy(midx, midy, msg);  
         getch();  
      }  

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

/* draw an "x" at (x, y) */  
void xat(int x, int y)  
{  
  line(x-4, y, x+4, y);  
  line(x, y-4, x, y+4);  
}  
   
   

函数名: settextstyle  
功  能: 为图形输出设置当前的文本属性  
用  法: void far settextstyle (int font, int direction, char size);  
程序例:  

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

/* the names of the text styles supported */  
char *fname[] = { "DEFAULT font",  
                  "TRIPLEX font",  
                  "SMALL font",  
                  "SANS SERIF font",  
                  "GOTHIC font"  
                };  

int main(void)  
{  
   /* request auto detection */  
   int gdriver = DETECT, gmode, errorcode;  
   int style, midx, midy;  
   int size = 1;  

   /* 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;  

   settextjustify(CENTER_TEXT, CENTER_TEXT);  

   /* loop through the available text styles */  
   for (style=DEFAULT_FONT; style<=GOTHIC_FONT; style++)  
   {  
      cleardevice();  
      if (style == TRIPLEX_FONT)  
         size = 4;  

      /* select the text style */  
      settextstyle(style, HORIZ_DIR, size);  

      /* output a message */  
      outtextxy(midx, midy, fname[style]);  
      getch();  
   }  

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

函数名: settextstyle  
功  能: 为图形输出设置当前的文本属性  
用  法: void far settextstyle (int font, int direction, char size);  
程序例:  

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

/* the names of the text styles supported */  
char *fname[] = { "DEFAULT font",  
                  "TRIPLEX font",  
                  "SMALL font",  
                  "SANS SERIF font",  
                  "GOTHIC font"  
                };  

int main(void)  
{  
   /* request auto detection */  
   int gdriver = DETECT, gmode, errorcode;  
   int style, midx, midy;  
   int size = 1;  

   /* 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;  

   settextjustify(CENTER_TEXT, CENTER_TEXT);  

   /* loop through the available text styles */  
   for (style=DEFAULT_FONT; style<=GOTHIC_FONT; style++)  
   {  
      cleardevice();  
      if (style == TRIPLEX_FONT)  
         size = 4;  

      /* select the text style */  
      settextstyle(style, HORIZ_DIR, size);  

      /* output a message */  
      outtextxy(midx, midy, fname[style]);  
      getch();  
   }  

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

函数名: settime  
功  能: 设置系统时间  
用  法: void settime(struct time *timep);  
程序例:  

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