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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); ; \& ?5 x3 x( S) Q; O
}
. m7 V0 R' I1 i. I% g. E. Vprintf("%s\n",string); 
2 e1 Q/ G0 H) [return 0;
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# \' k; H8 D" X) a% b$ a: Y
) f" P& [9 Q1 f" w) a2 [函数名: toupper 
; e6 y5 G/ w+ k$ n$ r. f9 W功能: 把字符转换成大写字母
9 A! _2 l) I, i1 S0 W- C% d用法: int toupper(int c); % D" L9 ]: W, R/ @
程序例: 
4 [. Z' Z6 r% K ?: T5 K* `#include <STRING.H>1 S3 z9 Q$ Y! p! ^4 H P' u
#include <STDIO.H>9 ~, ~* ]; h3 @; z0 S/ n2 ]
#include <CTYPE.H>
! N- f! Y- d: |% G9 C3 ?, S7 i3 kint main(void)
! P; H! ~5 H- S{ . A+ C) h2 Z7 ]% l( I8 W
int length, i; & W7 v% I+ h1 t/ A8 Y8 L) W
char *string = "this is a string"; 3 \* N# r4 ^: K, Z }7 X
length = strlen(string); 1 p. |( B/ x8 c( f) b* R. a9 T
for (i=0; i<LENGTH; {
& k7 X0 r" ?8 d" Ostring = toupper(string); 7 f8 E% k* V: P' d# @
} 
, b1 ` W. D z3 d/ X; N* Jprintf("%s\n",string); 
- c" M" e& C, q% Oreturn 0;
9 P7 r; m2 B, q' |: ?: ~} 
, Q! ^$ R/ X N7 N
3 D- T( X6 u, |4 C& Q' p5 H9 o% a
/ B7 x5 \1 a+ O( n函数名: tzset 2 N- s L6 s% _& S% K
功能: UNIX时间兼容函数
% s, p7 R1 q% C" F) ]+ s8 C用法: void tzset(void);
$ a7 e- B* `' H: ^* v程序例: ' E: g5 ]! q' d/ B9 P- _
#include <TIME.H>5 T. T3 Z) `7 y/ n$ M$ T$ c
#include <STDLIB.H>* s2 v/ w( S: i4 ^7 T$ M" m; Y* q
#include <STDIO.H>
# } H2 l ~$ N! f# q7 y. l# z: aint main(void)
0 l0 w" V2 @8 d+ S9 z$ L# E6 ~{
5 H3 J7 N' ^, _5 ?' `1 Ctime_t td; 
9 h" E3 E9 R! n7 J" yputenv("TZ=PST8PDT"); 5 t- Z# g2 Q8 O% m1 f$ {# U
tzset();
( w$ ?( o* e+ ]7 U7 J `% c! @time(&td);
! {9 C3 I1 C$ k9 P/ a( z; Xprintf("Current time = %s\n", asctime(localtime(&td)));
4 E) p1 e/ h* ] Ereturn 0;
, K- d \: f0 }1 H! n; R# R0 Z} 

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