查看: 2189|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); 4 Z$ F6 c" t# }* [5 c9 v
}
! [- x& |; I' I- Q+ e7 jprintf("%s\n",string); 
1 R8 h! x! D5 |6 T6 u/ K4 areturn 0; ' F' M; P1 u3 @( `. P
} 7 C ~) U% k) g2 t9 Y4 v( N

2 K8 w K% C% u* j2 {( I$ k7 `. h, ~( }* m! r" Z
函数名: toupper 
0 M9 T9 E) }0 h: ]* ]6 e8 Q. q4 f1 y功能: 把字符转换成大写字母
$ z# H' X7 _* m2 a用法: int toupper(int c); ! D9 q% ~9 ]+ m# w
程序例: : s) m) q# d4 I3 G# Y- h
#include <STRING.H>
- E- w( |3 E! F. i8 T#include <STDIO.H>
: c7 V. t: X; u) h#include <CTYPE.H>+ ~1 J" Z1 n* n* Z8 v
int main(void) 7 L& U$ p7 ^3 b: p; S9 z% E# P
{ s, Y# k2 L) r/ E8 x
int length, i; ' _. O: k; I% j! b
char *string = "this is a string"; 
4 L. T: r" z5 U6 V9 tlength = strlen(string); 9 |, R, \' z8 x2 \
for (i=0; i<LENGTH; {
7 E. I" E# |. hstring = toupper(string);
9 i; Z: e; C) a1 P- ?+ l' |} 
% q1 L# _: J( Y) w: B7 `printf("%s\n",string); 0 d& f, D: V' K/ H% V
return 0; 6 @, U6 V- t$ m
} 
 V9 B% Q; W |
% _* q x' ?( d
- n. }: T7 B4 W; P4 U/ P! n函数名: tzset " ^0 R6 A5 c# G0 Z' T) ]
功能: UNIX时间兼容函数
 F. t+ d1 M3 c! |用法: void tzset(void); $ s6 R6 L+ x, _' p8 A7 R2 u+ I
程序例: + K8 d5 t% L2 h/ `$ x& ~7 ]
#include <TIME.H>* q; E) T1 i3 t3 j
#include <STDLIB.H>
#include <STDIO.H>, C& `" M- N# b- A$ I
int main(void) ! _' s" E. h9 n1 p) }! E- Q
{
7 K$ R; t. k, g' a. x" ]# ^/ ztime_t td; 
8 ~3 `- v& c0 v, }4 zputenv("TZ=PST8PDT");
: S" _5 w1 J3 i) itzset();
+ e, H) A9 r a: y8 ]: ctime(&td);
7 O4 w7 G- D3 g+ P4 Xprintf("Current time = %s\n", asctime(localtime(&td)));
/ ~1 r- m" K+ F+ V# qreturn 0;
+ }3 ]: H: T/ M: I/ l' X}