C函数大全T.doc

函数大全(T开头)函数名: tan 功 能: 正切函数 用 法: double tan(double x); 程序例: #include #include int main(void) double result, x; x = 0.5; result = tan(x); printf(The tan of %lf is %lfn, x, result); return 0; 函数名: tanh 功 能: 双曲正切函数 用 法: double tanh(double x); 程序例: #include #include int main(void) double result, x; x = 0.5; result = tanh(x); printf(The hyperbolic tangent of %lf is %lfn, x, result); return 0; 函数名: tell 功 能: 取文件指针的当前位置 用 法: long tell(int handle); 程序例: #include #include #include #include int main(void) int handle; char msg = Hello world; if (handle = open(TEST.$, O_CREAT | O_TEXT | O_APPEND) = -1) perror(Error:); return 1; write(handle, msg, strlen(msg); printf(The file pointer is at byte %ldn, tell(handle); close(handle); return 0; 函数名: textattr 功 能: 设置文本属性 用 法: void textattr(int attribute); 程序例: #include int main(void) int i; clrscr(); for (i=0; i9; i+) textattr(i + (i+1) 4); cprintf(This is a testrn); return 0; 函数名: textbackground 功 能: 选择新的文本背景颜色 用 法: void textbackground(int color); 程序例: #include int main(void) int i, j; clrscr(); for (i=0; i9; i+) for (j=0; j80; j+) cprintf(C); cprintf(rn); textcolor(i+1); textbackground(i); return 0; 函数名: textcolor 功 能: 在文本模式中选择新的字符颜色 用 法: void textcolor(int color); 程序例: #include int main(void) int i; for (i=0; i15; i+) textcolor(i); cprintf(Foreground Colorrn); return 0; 函数名: textheight 功 能: 返回以像素为单位的字符串高度 用 法: int far textheight(char far *textstring); 程序例: #include #include #include #include int main(void) /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int y = 0; int i; char msg80; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ printf(Graphics error: %sn, grapherrormsg(errorcode); printf(Press any key to halt:); getch(); exit(1); /* terminate with an error code */ /* draw some text on the screen */ for (i=1; i11; i+) /* select the text style, direction, and size */ settextstyle(TRIPLEX_FONT, HORIZ_DIR, i); /* create a message string */ sprintf(msg, Size: %d, i); /* output the message */ outtextxy(1, y, msg); /* advance to the next text line */ y += textheight(msg); /* clean up */ getch(); closegraph(); return 0; 函数名: textmode 功 能: 将屏幕设置成文本模式 用 法: void textmode(int mode); 程序例: #include int main(void) textmode(BW40); cprintf(ABC); getch(); textmode(C40); cprintf(ABC); getch(); textmode(BW80); cprintf(ABC); getch(); textmode(C80); cprintf(ABC); getch(); textmode(MONO); cprintf(ABC); getch(); return 0; 函数名: textwidth 功 能: 返回以像素为单位的字符串宽度 用 法: int far textwidth(char far *textstring); 程序例: #include #include #include #include int main(void) /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int x = 0, y = 0; int i; char msg80; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ printf(Graphics error: %sn, grapherrormsg(errorcode); printf(Press any key to halt:); getch(); exit(1); /* terminate with an error code */ y = getmaxy() / 2; settextjustify(LEFT_TEXT, CENTER_TEXT); for (i=1; i11; i+) /* select the text style, direction, and size */ settextstyle(TRIPLEX_FONT, HORIZ_DIR, i); /* create a message string */ sprintf(msg, Size: %d, i); /* output the message */ outtextxy(x, y, msg); /* advance to the end of the text */ x += textwidth(msg); /* clean up */ getch(); closegraph(); return 0; 函数名: time 功 能: 取一天的时间 用 法: logn time(long *tloc); 程序例: #include #include #include int main(void) time_t t; t = time(NULL); printf(The number of seconds since January 1, 1970 is %ld,t); return 0; 函数名: tmpfile 功 能: 以二进制方式打开暂存文件 用 法: FILE *tmpfile(void); 程序例: #include #include int main(void) FILE *tempfp; tempfp = tmpfile(); if (tempfp) printf(Temporary file createdn); else printf(Unable to create temporary filen); exit(1); return 0; 函数名: tmpnam 功 能: 创建一个唯一的文件名 用 法: char *tmpnam(char *sptr); 程序例: #include int main(void) char name13; tmpnam(name); printf(Temporary name: %sn, name); return 0; 函数名: tolower 功 能: 把字符转换成小写字母 用 法: int tolower(int c); 程序例: #include #include #include int main(void) int length, i; char *string = THIS IS A STRING; length = strlen(string); for (i=0; i stringi = tolower(stringi); printf(%sn,string); return 0; 函数名: toupper 功 能: 把字符转换成大写字母 用 法: int toupper(int c); 程序例: #include #include #include int main(void) int length, i; char *string = this is a string; length = strlen(string); for (i=0; i stringi = toupper(stringi); p