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标题: 函数大全(t开头) [打印本页]

作者: 韩冰 时间: 2004-10-4 02:54
标题: 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 <STDIO.H>
#include <MATH.H>
<

>int main(void)
{
double result, x; 
<

>x = 0.5;
result = tan(x);
printf("The tan of %lf is %lf\n", 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 <STDIO.H>
#include <MATH.H>
<

>int main(void)
{
double result, x; 
<

>x = 0.5;
result = tanh(x);
printf("The hyperbolic tangent of %lf is %lf\n", 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 <STRING.H>
#include <STDIO.H>
#include <FCNTL.H>
#include <IO.H>
<

>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 %ld\n", 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 <CONIO.H>
<

>int main(void)
{
int i; 
<

>clrscr();
for (i=0; i<9; i++)
{
textattr(i + ((i+1) << 4));
cprintf("This is a test\r\n");
} 
<

>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 <CONIO.H>
<

>int main(void)
{
int i, j; 
<

>clrscr();
for (i=0; i<9; i++)
{
for (j=0; j<80; j++)
cprintf("C");
cprintf("\r\n");
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 <CONIO.H>
<

>int main(void)
{
int i; 
<

>for (i=0; i<15; i++)
{
textcolor(i);
cprintf("Foreground Color\r\n");
} 
<

>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 <GRAPHICS.H>
#include <STDLIB.H>
#include <STDIO.H>
#include <CONIO.H>
<

>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int y = 0;
int i;
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 */
} 
/* draw some text on the screen */
for (i=1; i<11; 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 <CONIO.H>
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 <GRAPHICS.H>
#include <STDLIB.H>
#include <STDIO.H>
#include <CONIO.H>
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int x = 0, y = 0;
int i;
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 */
} 
y = getmaxy() / 2; 
settextjustify(LEFT_TEXT, CENTER_TEXT);
for (i=1; i<11; 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 <TIME.H>
#include <STDIO.H>
#include <DOS.H>
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 <STDIO.H>
#include <PROCESS.H>
int main(void)
{
FILE *tempfp; 
tempfp = tmpfile();
if (tempfp)
printf("Temporary file created\n");
else
{
printf("Unable to create temporary file\n");
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 <STDIO.H>
int main(void)
{
char name[13]; 
tmpnam(name);
printf("Temporary name: %s\n", 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 <STRING.H>
#include <STDIO.H>
#include <CTYPE.H>
int main(void)
{
int length, i;
char *string = "THIS IS A STRING"; 
length = strlen(string);
for (i=0; i<LENGTH; {
string = tolower(string); 1 k3 M. s! H5 N5 i$ X0 `4 a
} , p# x+ v6 c3 T
printf("%s\n",string); 9 y9 K$ [% @" `4 }" b
return 0;
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+ Q% W) p5 d- ^8 ]$ j+ f& d6 v# a% U7 p0 X" L
- D& i$ x, K3 O! d Y3 A
函数名: toupper 
 y9 V* Z) n/ ~+ |功能: 把字符转换成大写字母 : O4 K2 X* l6 ~, f% j; M
用法: int toupper(int c);
0 I9 ~* g; Y" g5 F3 E1 ?& J5 N程序例: 
6 c$ j3 Q; q) E' D#include <STRING.H>
% f6 p+ E$ Y, _4 B1 J# C#include <STDIO.H>
8 w6 I: a% d, J `! ^0 k9 y0 P#include <CTYPE.H>
! s5 G8 Y0 w) m* ~$ d& Dint main(void)
4 B+ @3 z* |" ^) g{
, ~1 C; u& Y4 @& nint length, i;
* ]/ `# [7 l8 H* Ichar *string = "this is a string"; 
2 d6 |" E) P/ b- ^length = strlen(string); 7 ]% Y$ F& ? f% N$ P: a
for (i=0; i<LENGTH; {
; o6 u; e. C+ t+ g1 Ystring = toupper(string);
# w2 D+ S3 h9 R! K} 3 V. L3 W& _7 L A3 @
printf("%s\n",string); 
# A& I6 z0 k2 u" x4 U) creturn 0;
2 I. ?* G0 V0 m0 g1 s& \$ D3 f$ v, D} 5 N- v8 y. t; ?" B! ?: O& {- N

8 H5 Y3 S' S, ~0 U
4 v; z) B/ L+ V3 I函数名: tzset 
2 v$ j4 @, {" m功能: UNIX时间兼容函数
/ F ~3 I$ ^/ r3 b$ r用法: void tzset(void); ' `$ `+ l l% A. Q! r3 A: }' K
程序例: 
# f7 l g1 ^( U#include <TIME.H>6 e5 j2 R. h, z+ F
#include <STDLIB.H>6 d+ c1 J; J# ]( o! ]# \+ u
#include <STDIO.H>, l0 p+ @5 }2 [ }4 c8 l# S' ]
int main(void) 8 r# r- A5 c4 E# t
{
6 W+ k. G6 U) Q) |/ o% t" ntime_t td; ! V, l% d& }% Y2 ]
putenv("TZ=PST8PDT");
8 t: H8 Z9 ]' n& Utzset();
: l. d# I2 _6 Z xtime(&td);
$ V+ U u+ h: r* Uprintf("Current time = %s\n", asctime(localtime(&td)));
) x2 ~: V0 I7 z) y+ X9 dreturn 0;
5 v: }3 L4 V H- F5 u! [} 

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