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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); + h( l$ O2 H9 }: \3 E" {) @: [
}
: B# P/ j& O# h5 a' Nprintf("%s\n",string); 
- n0 A. U6 [ l& _6 g$ c% Lreturn 0;
" h: \+ S9 R8 J) F}
. A( [# `0 S. F J" F( W. K/ V* X5 u
/ q0 a+ r& _# z# Z6 i4 C
函数名: toupper 1 C/ ~8 O8 H0 C6 X; ]% z* w
功能: 把字符转换成大写字母 1 P+ Y) q. I- ]
用法: int toupper(int c);
( u, U4 X7 m3 L! x% @0 g% [5 c; I程序例: 
3 E4 }6 X! K- u+ H#include <STRING.H>6 G5 A* P& U" \' ^% h
#include <STDIO.H>2 I. N) l0 j, ?2 q! Z, K
#include <CTYPE.H>0 T8 \' j( b! Z2 y
int main(void) * H6 d3 E# T8 Z( d9 E1 q4 h
{ ) Y- p0 G C5 D4 n, C. {
int length, i; % l6 t' z+ |1 ^, u3 c
char *string = "this is a string"; ' q y/ U9 C# h- E
length = strlen(string);
. W9 H5 j( B. G* r$ mfor (i=0; i<LENGTH; { / [; N( c7 `4 r# w6 z
string = toupper(string); 2 ^- U }# u4 X N/ E
} 
% b: d6 F5 s1 e4 m. i/ mprintf("%s\n",string); 
* q" m" o, R. Creturn 0; x% Y. g! w- _1 I' F
} 
! U& D( t2 R) |- z$ n! [: Y$ r0 @ p! W

6 n2 ~* U7 U3 E0 n4 V* S函数名: tzset 8 `8 F, K9 t/ j6 A# H% H
功能: UNIX时间兼容函数 8 V# I# r* f) t% ^6 j: n* n. M6 ^! u
用法: void tzset(void); ) k3 x6 a! B5 P9 E/ d! g! q' @( Y
程序例: 5 Q0 O V' l% o0 H$ Z3 x6 g' e+ o
#include <TIME.H>, h' o" ~( i. K& B
#include <STDLIB.H>
5 A' r: b. D* D% \#include <STDIO.H>
* H6 ^5 f& ^7 C" ^, j [ }, nint main(void) / F3 a: G, h9 R ?0 ^; J
{ . T h+ j% ?, B- j! i% c5 o+ n
time_t td; 
0 p* Y- v- \" h3 a+ t) gputenv("TZ=PST8PDT");
* m6 t8 ~1 p5 O2 o' Stzset(); / b2 {3 t6 z0 T
time(&td);
) q' g1 c# E- M* O9 f6 Oprintf("Current time = %s\n", asctime(localtime(&td)));
8 m" E1 n" y: B# z. U2 yreturn 0; ) |# C3 O4 ?$ P0 ~
} 

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