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函数大全(t开头)

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发表于 2004-10-4 02:54 |只看该作者 |正序浏览

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<

>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);
, W9 c' q Q+ ^# _* b- s} 9 n/ y. t, K8 @6 i( y) P1 U
printf("%s\n",string); 
3 o S5 j0 j4 u* k) {return 0; # X4 W p& J* J7 j0 P4 H0 ^
} ) @$ \2 s: ^% P: \! g: K

# W% j) f, { b' d+ N7 X7 U/ A& K
) R( Z1 I# F6 p3 W4 n函数名: toupper 7 K3 k& p' U! ]! H
功能: 把字符转换成大写字母
9 }2 i5 a$ N8 S/ Q5 L用法: int toupper(int c); $ \0 s& ~ l6 {: T
程序例: 
' l) K# ~4 e/ \9 ~" a$ Q* e" B#include <STRING.H>
 Z# ]: [( O( c! h( F' x, {* |#include <STDIO.H>* d; R- }( V3 ?; W) C
#include <CTYPE.H>
1 ?( f( y3 X1 {/ C% E3 Aint main(void)
! G/ W5 z" e; Z{ 3 `* t/ j. k* k- \! `: l* n
int length, i;
# r% h3 T* i* V) v2 pchar *string = "this is a string"; ; \* Q5 b4 \5 f- S! Y5 v0 g3 I
length = strlen(string); " y K. a' S( L3 K' M
for (i=0; i<LENGTH; { 5 P2 _; F2 S" N+ R
string = toupper(string); ( C/ p& E& T% M; a% O8 o3 _+ c
} ) m# S: z# S5 T8 l, }0 R$ t
printf("%s\n",string); 
' y3 J4 u2 K4 ?return 0;
: v3 ~1 ^9 y( k: Z R# s1 g} 
3 e: H6 h# I0 S) T0 o# g A- @1 g1 T! k# _
+ c7 S) `) U6 y' a. o( _6 ^" ]& D
函数名: tzset 7 z" V$ ?+ { j7 r# ^2 B; _
功能: UNIX时间兼容函数
9 V, z9 `8 V; ^# X6 ^用法: void tzset(void); 1 Q2 ]% e( K; V2 W) ~6 B1 i" ^
程序例: * R8 g3 Q/ H, T N7 |7 H
#include <TIME.H>" l% I' P3 C1 v/ `7 M
#include <STDLIB.H>
$ A$ q" Y. ]$ H% c1 A" F0 h; X#include <STDIO.H>" d- p9 M3 @ n7 ?1 M! i, E8 @
int main(void) 7 A4 G7 {3 Z$ M( Y/ \
{ , X0 K7 F( m& D9 S. H0 z; a
time_t td; ) z0 T+ ^$ z8 ? r
putenv("TZ=PST8PDT"); ; w7 |8 f+ a% G( B, d: \
tzset();
, W" n8 }! D- B d# Wtime(&td); 1 O$ q% Z7 D7 m4 }1 T( i8 d% k1 ]0 x
printf("Current time = %s\n", asctime(localtime(&td))); ! J+ M( w+ B) m7 `* b8 A' Y |( r5 o
return 0; * z& D7 g* [/ D5 C% L X' ?
}