查看: 2104|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);
& G+ @1 J' [/ g/ m' [}
* q- E: n! V* B$ q: K$ T% |printf("%s\n",string); 
4 @# H! x+ B* Z( U0 T! Greturn 0; 6 b& w# ?5 n, z! }
} / r3 }% w/ s/ c' z* z- S- u9 q" S

" q* f! r1 i# t. c# |: U9 p" {9 p2 m* g+ J7 m! ~: v2 i5 _
函数名: toupper 
1 A' b* |" d+ \$ m2 p功能: 把字符转换成大写字母
% W- S' h8 C1 K# @用法: int toupper(int c); * {% P/ @- T9 [' z. ~5 `) ?
程序例: 
7 \, E. S, Q# |9 I: c* d7 Z; v! O! Y#include <STRING.H>- V T, b2 t) A
#include <STDIO.H>' F) i1 L+ q/ @1 h
#include <CTYPE.H>6 X% @! Y9 Z& T( ^, q' e
int main(void)
3 j6 ]0 V$ B8 P2 A J6 C{
2 {& N' U4 V# d( V$ pint length, i;
9 ]' }' y6 {# G- achar *string = "this is a string"; 
' A' I F6 c7 nlength = strlen(string); ! a0 @6 C" E$ E% I, d4 ]+ {$ u
for (i=0; i<LENGTH; {
8 E5 f5 v) R4 W1 C9 g6 ~string = toupper(string);
9 p: I8 ?& c5 V/ l+ {; ]} 
printf("%s\n",string); ' S4 F& e4 K1 F% s4 }/ L
return 0;
0 {1 h( `, U/ _; @} 
4 }% l- @6 {- l5 @
9 }. s) b7 V& F7 g- c8 D( q1 P
5 E- W* m& V$ B+ h8 L* E$ i3 [函数名: tzset 
% w/ q6 J' q8 C) w" G功能: UNIX时间兼容函数 # ~0 n; s% ^1 X
用法: void tzset(void); ! |* M9 V" _% i1 c
程序例: 0 r' t# c! |) Y4 n6 d0 y
#include <TIME.H>
: Y) J, j5 v! @% `8 Z#include <STDLIB.H>1 D/ K. R2 G9 ^. E
#include <STDIO.H>
/ b& t. H9 q+ J$ Hint main(void)
5 k+ n7 P) z; x$ o{
/ z! q5 w0 ?( S" O0 Q1 }time_t td; g# w) D! [# J i# q% z
putenv("TZ=PST8PDT"); - c/ \3 i1 f! T- @$ T: [3 a8 F% e4 J3 V
tzset(); ; D, v% T+ |7 m( I- l& x! u' B0 Q
time(&td); % v5 N+ Q; q, f0 q2 {2 u* e( w
printf("Current time = %s\n", asctime(localtime(&td)));
; Q: S! B; S4 }' q7 N- }& mreturn 0; ) b3 {' Z# O' F4 Q Y
}