查看: 2170|回复: 0

函数大全(t开头)

字体大小: 正常放大

韩冰

823 主题	3 听众	4048 积分

我的地盘我做主

该用户从未签到

电梯直达

1^#

发表于 2004-10-4 02:54 |只看该作者 |倒序浏览

|招呼Ta 关注Ta

<

>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); 6 |# v i, F$ f5 A" F: {& X3 ^
}
9 W$ @" o, l( ~+ {+ t8 k; |printf("%s\n",string); ! v, c3 c. k( L
return 0;
1 B) m. h9 |3 j; m+ H1 D: s" l} , H7 D/ m# }! y/ S! x. Z8 G, S

 x0 i# Y2 ]. D2 ?' ?6 x
' W' C$ }& q5 P Y7 r! ]. L. [函数名: toupper 
 s; P9 Y+ y- y: n3 |6 m% C& L功能: 把字符转换成大写字母 + x6 V9 Z+ q+ T7 H T# f
用法: int toupper(int c);
$ b% \" X3 R3 g) p2 d+ a3 |程序例: 
$ O7 f6 ]! Z4 }: N& P#include <STRING.H>
7 R7 M, ~- p8 s H9 u) |; E#include <STDIO.H>7 ?1 f$ ^8 v' h( D6 {6 }3 S; s
#include <CTYPE.H>- x4 P: U9 k; `: ]& e0 W
int main(void) 7 p! k% K# R/ `# \( ?" [
{ 0 |& F3 Z6 h4 B8 l8 I
int length, i; 8 q6 ^8 N# \3 ~ ?) |
char *string = "this is a string"; 
# M# ~9 N# |1 i! xlength = strlen(string); / P0 y, g; ~; k: f; B
for (i=0; i<LENGTH; {
7 C+ ~& ?9 E& A9 z. J* ^9 F5 tstring = toupper(string); . @' z$ V: r& t! @
} 9 ^- D( @, f% d0 d6 D% Q
printf("%s\n",string); 
( j( u, `3 v& h( m# nreturn 0; ( H5 s h8 [' m8 o5 ^, }
} 8 y, E/ j5 _ K6 n) d6 M

+ M" g+ v9 |$ s0 g: A- U; F; V; `, ~7 ]* F! {5 Y" _$ X
函数名: tzset 6 i+ C2 @5 F1 w
功能: UNIX时间兼容函数 0 Y4 p% E4 X+ `: A" g, P. W* c
用法: void tzset(void);
0 b2 {2 M* \( q- w6 m7 \$ |. W程序例: 
4 O t5 N. J" Q) c$ _- C#include <TIME.H>
. f4 B0 B7 {# i2 P' G7 F6 x G! @#include <STDLIB.H>3 _( G1 _! B# ^
#include <STDIO.H>
/ T: \. J- d3 D6 }: K- ]int main(void)
( T" A( P, \7 N, }. X5 U! i{
' X6 B3 A! f' ^# `: o1 Jtime_t td; 
4 i7 n5 p! _. {9 X8 K9 U. Oputenv("TZ=PST8PDT"); ( ~4 @$ o* w* \0 p7 ^' }
tzset();
3 ~! L# b' p/ a' w3 G0 stime(&td); $ d6 A, a# z: F
printf("Current time = %s\n", asctime(localtime(&td)));
3 X0 _, i9 z) a7 W0 Ireturn 0;
5 m+ y0 c2 z2 t7 t5 S2 P9 \9 w}