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    1. 站長資訊網(wǎng)
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      C語言函數(shù)大全 a

      函數(shù)名: abort
      功  能: 異常終止一個進(jìn)程
      用  法: void abort(void);
      程序例:
      #include <stdio.h>
      #include <stdlib.h>

      int main(void)
      {
        printf(“Calling abort()n”);
        abort();
        return 0; /* This is never reached */
      }
       
       

      函數(shù)名: abs
      功  能: 求整數(shù)的絕對值
      用  法: int abs(int i);
      程序例:
      #include <stdio.h>
      #include <math.h>

      int main(void)
      {
        int number = -1234;

        printf(“number: %d  absolute value: %dn”, number, abs(number));
        return 0;
      }
       
       

      函數(shù)名: absread, abswirte
      功  能: 絕對磁盤扇區(qū)讀、寫數(shù)據(jù)
      用  法: int absread(int drive, int nsects, int sectno, void *buffer);
       int abswrite(int drive, int nsects, in tsectno, void *buffer);
      程序例:
      /* absread example */

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

      int main(void)
      {
        int i, strt, ch_out, sector;
        char buf[512];

        printf(“Insert a diskette into drive A and press any keyn”);
        getch();
        sector = 0;
        if (absread(0, 1, sector, &buf) != 0)
        {
           perror(“Disk problem”);
           exit(1);
        }
        printf(“Read OKn”);
        strt = 3;
        for (i=0; i<80; i++)
        {
           ch_out = buf[strt+i];
           putchar(ch_out);
        }
        printf(“n”);
        return(0);
      }
       
       
       

      函數(shù)名: access
      功  能: 確定文件的訪問權(quán)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: %sn”,
        file_exists(“NOTEXISTS.FIL”) ? “YES” : “NO”);
        return 0;
      }

      int file_exists(char *filename)
      {
        return (access(filename, 0) == 0);
      }
       

      函數(shù)名: acos
      功  能: 反余弦函數(shù)
      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 %lfn”, x, result);
        return 0;
      }
       
       

      函數(shù)名: allocmem
      功  能: 分配DOS存儲段
      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: %xn”, segp);
        else
           printf(“Failed: maximum number of paragraphs available is %un”,
                  stat);

        return 0;
      }
       
       

      函數(shù)名: arc
      功  能: 畫一弧線
      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: %sn”, 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;
      }
       
       

      函數(shù)名: asctime
      功  能: 轉(zhuǎn)換日期和時間為ASCII碼
      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(“%sn”, str);

         return 0;
      }
       
       
       

      函數(shù)名: asin
      功  能: 反正弦函數(shù)
      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 %lfn”, x, result);
         return(0);
      }
       
       
       

      函數(shù)名: assert
      功  能: 測試一個條件并可能使程序終止
      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;
      }
       
       
       

      函數(shù)名: atan
      功  能: 反正切函數(shù)
      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 %lfn”, x, result);
         return(0);
      }
       
       

      函數(shù)名: atan2
      功  能: 計算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 %lfn”, (y / x), result);
         return 0;
      }
       
       

      函數(shù)名: atexit
      功  能: 注冊終止函數(shù)
      用  法: int atexit(atexit_t func);
      程序例:
      #include <stdio.h>
      #include <stdlib.h>

      void exit_fn1(void)
      {
         printf(“Exit function #1 calledn”);
      }

      void exit_fn2(void)
      {
         printf(“Exit function #2 calledn”);
      }

      int main(void)
      {
         /* post exit function #1 */
         atexit(exit_fn1);
         /* post exit function #2 */
         atexit(exit_fn2);
         return 0;
      }
       
       
       

      函數(shù)名: atof
      功  能: 把字符串轉(zhuǎn)換成浮點數(shù)
      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 = %fn”, str, f);
         return 0;
      }
       
       

      函數(shù)名: atoi
      功  能: 把字符串轉(zhuǎn)換成長整型數(shù)
      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 = %dn”, str, n);
         return 0;
      }
       
       

      函數(shù)名: atol
      功  能: 把字符串轉(zhuǎn)換成長整型數(shù)
      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 = %ldn”, str, l);
         return(0);
      }

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