函数名:abort功 能:异常终止一个进程函数与形参类型:void abort(void);程序例:#include #include int main(void){printf("Calling abort()\n");abort();return 0; /* This is never reached */}函数名:abs功 能:计算整数num的值。函数与参数类型:int abs(num)int num;程序例:#include #include int main(void){int number = -1234; printf("number: %d absolute value: %d\n", number, abs(number));return 0;}函数名:absread, abswirte功 能:绝对磁盘扇区读、写数据函数与形参类型: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 #include #include #include int main(void){int i, strt, ch_out, sector;char buf; 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函数与形参类型:int access(const char *filename, int amode);程序例:#include #include 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:计算并返回arccos(x)值、要求-1<=X<=1函数与形参类型:double acos(x)double x;程序例:#include #include 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存储段函数与形参类型:int allocmem(unsigned size, unsigned *seg);程序例:#include #include #include 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);elseprintf("Failed: maximum number of paragraphs available is %u\n",stat); return 0;}函数名:arc功 能:画一弧线函数与形参类型:void far arc(int x, int y, int stangle, int endangle, int radius);程序例:#include #include #include #include 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码函数与形参类型:char *asctime(const struct tm *tblock);程序例:#include #include #include int main(void){struct tm t;char str; /* 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 terminatedstring */ strcpy(str, asctime(&t));printf("%s\n", str); return 0;}函数名::asin功 能::计算并返回arcsin(x)值、要求-1<=X<=1函数与形参类型:double asin(x)double x;程序例:#include #include 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函数与形参类型:void assert(int test);程序例:#include #include #include 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:计算并返回arctan(x)的值函数与形参类型:double atan(double x);程序例:#include #include 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:计算并返回arctan(x/y)值函数与形参类型:double atan2(double y, double x);程序例:#include #include 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:注册终止函数函数与形参类型:int atexit(atexit_t func);程序例:#include #include 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str指向的ASCⅡ字符串转换成一个double型整数返回双精度的结果函数与形参类型:double atof(str)char*str;程序例:#include #include 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str指向的ASCⅡz字符串转换成一个整数。返回整数结果函数与参数类型:double atoi(str )char *str;程序例:#include #include 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 。返回长整数结果函数与参数类型:long atol(str )char *str;程序例:#include #include int main( void){long l;char *str = "98765432"; l = atol(lstr);printf("string = %s integer = %ld\n", str, l);return(0);}函数名:mkdir功 能:建立一个目录用 法:int mkdir(char *pathname);程序例:#include #include #include #include int main(void){int status;clrscr();status = mkdir("asdfjklm");(!status) ? (printf("Directory created\n")) :(printf("Unable to create directory\n"));getch();system("dir");getch();status = rmdir("asdfjklm");(!status) ? (printf("Directory deleted\n")) :(perror("Unable to delete directory"));return 0;}函数名:mktemp功 能:建立唯一的文件名用 法:char *mktemp(char *template);程序例:#include #include int main(void){/* fname defines the template for thetemporary file. */char *fname = "TXXXXXX", *ptr;ptr = mktemp(fname);printf("%s\n",ptr);return 0;}函数名:MK_FP功 能:设置一个远指针用 法:void far *MK_FP(unsigned seg, unsigned off);程序例:#include #include int main(void){int gd, gm, i;unsigned int far *screen;detectgraph(&gd, &gm);if (gd == HERCMONO)screen = MK_FP(0xB000, 0);elsescreen = MK_FP(0xB800, 0);for (i=0; i<26; i++)screen[i] = 0x0700 + ('a' + i);return 0;}函数名:modf功 能:把数分为整数和尾数用 法:double modf(double value, double *iptr);程序例:#include #include int main(void){double fraction, integer;double number = 100000.567;fraction = modf(number, &integer);printf("The whole and fractional parts of %lf are %lf and %lf\n",number, integer, fraction);return 0;}函数名:movedata功 能:拷贝字节用 法:void movedata(int segsrc, int offsrc, int segdest,int offdest, unsigned numbytes);程序例:#include #define MONO_BASE 0xB000/* saves the contents of the monochrome screen in buffer */void save_mono_screen(char near *buffer){movedata(MONO_BASE, 0, _DS, (unsigned)buffer, 80*25*2);}int main(void){char buf[80*25*2];save_mono_screen(buf);}函数名:moverel功 能:将当前位置(CP)移动一相对距离用 法:void far moverel(int dx, int dy);程序例:#include #include #include #include int main(void){/* request auto detection */int gdriver = DETECT, gmode, errorcode;char msg;/* 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 */}/* move the C.P. to location (20, 30) */moveto(20, 30);/* plot a pixel at the C.P. */putpixel(getx(), gety(), getmaxcolor());/* create and output a message at (20, 30) */sprintf(msg, " (%d, %d)", getx(), gety());outtextxy(20, 30, msg);/* move to a point a relative distance *//* away from the current value of C.P. */moverel(100, 100);/* plot a pixel at the C.P. */putpixel(getx(), gety(), getmaxcolor());/* create and output a message at C.P. */sprintf(msg, " (%d, %d)", getx(), gety());outtext(msg);/* clean up */getch();closegraph();return 0;}函数名:movetext功 能:将屏幕文本从一个矩形区域拷贝到另一个矩形区域用 法:int movetext(int left, int top, int right, int bottom,int newleft, int newtop);程序例:#include #include int main(void){char *str = "This is a test string";clrscr();cputs(str);getch();movetext(1, 1, strlen(str), 2, 10, 10);getch();return 0;}函数名:moveto功 能:将CP移到(x, y)用 法:void far moveto(int x, int y);程序例:#include #include #include #include int main(void){/* request auto detection */int gdriver = DETECT, gmode, errorcode;char msg;/* 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 */}/* move the C.P. to location (20, 30) */moveto(20, 30);/* plot a pixel at the C.P. */putpixel(getx(), gety(), getmaxcolor());/* create and output a message at (20, 30) */sprintf(msg, " (%d, %d)", getx(), gety());outtextxy(20, 30, msg);/* move to (100, 100) */moveto(100, 100);/* plot a pixel at the C.P. */putpixel(getx(), gety(), getmaxcolor());/* create and output a message at C.P. */sprintf(msg, " (%d, %d)", getx(), gety());outtext(msg);/* clean up */getch();closegraph();return 0;}函数名:movemem功 能:移动一块字节用 法:void movemem(void *source, void *destin, unsigned len);程序例:#include #include #include #include int main(void){char *source = "Borland International";char *destination;int length;length = strlen(source);destination = malloc(length + 1);movmem(source,destination,length);printf("%s\n",destination);return 0;}函数名:normvideo功 能:选择正常亮度字符用 法:void normvideo(void);程序例:#include int main(void){normvideo();cprintf("NORMAL Intensity Text\r\n");return 0;}函数名:nosound功 能:关闭PC扬声器用 法:void nosound(void);程序例:/* Emits a 7-Hz tone for 10 seconds.True story: 7 Hz is the resonant frequency of a chicken's skull cavity.This was determined empirically in Australia, where a new factorygenerating 7-Hz tones was located too close to a chicken ranch:When the factory started up, all the chickens died.Your PC may not be able to emit a 7-Hz tone.*/int main(void){sound(7);delay(10000);nosound();}