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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); # C8 [7 Y# c6 k; A2 L9 u6 s0 j
}
( D4 _/ j: g& p9 `$ M% bprintf("%s\n",string); 
& k( d2 g# j; H( ereturn 0;
! @- c$ q! c( _) b# u2 m} ( l5 l9 p5 ^+ x% X G2 a, N7 t5 e

3 P7 C8 c/ |8 N; i% ~* h& y9 C+ G
. Z; r! w; |- {3 l$ A! m: v1 r函数名: toupper 
7 y# a1 n* `9 y. W' t) p8 W9 ~# U功能: 把字符转换成大写字母 / v3 ~, q; g2 k+ Z' p) L; E
用法: int toupper(int c);
# @% y' b' t" |6 }程序例: 
8 P, n2 n2 D4 H0 P; |#include <STRING.H>
( s7 k4 ^* ~4 a$ |8 k. O/ u* d#include <STDIO.H>8 t6 b$ O& U% [! `" F9 F
#include <CTYPE.H>
$ u0 q' O' C0 V; p1 h/ [1 ?int main(void) + J# `' r- y/ a2 g5 {5 k% R
{ 9 |: u( E6 s) p3 n1 }; E
int length, i; 2 ~6 {# m% n. A" w3 N
char *string = "this is a string"; 
! F. }) a. f W( Z0 ~' Z! rlength = strlen(string);
1 g7 ^# b/ V3 z4 R* I6 L& }9 rfor (i=0; i<LENGTH; { 0 C: R1 w/ R/ ^9 s# a; T5 f
string = toupper(string); h( ^6 r% i9 r4 Y9 P! L
} 
1 x9 ?: Q6 D. y% H5 h: ?printf("%s\n",string); 
& F" z( Y, V+ C# r# H& sreturn 0; 3 Y# @* B9 Q5 A1 \4 }* v
} . h& d% ^# ` S' h
 `& [5 Z3 h! ], ^4 ?( T; `
# I0 B1 C7 Y( Q, `
函数名: tzset ! a$ a1 @% F& }; o$ v" K& s7 Y
功能: UNIX时间兼容函数
% i; U! R; S' X' A" ?! K! D" C用法: void tzset(void);
/ R1 ^" x6 ~8 X# J+ {程序例: 5 w5 P. |3 z- C0 E% x
#include <TIME.H>
# t. ]2 Z% P/ U#include <STDLIB.H>2 ~. V. K6 O& [6 v+ C
#include <STDIO.H>4 a$ O1 ?7 `* C% N
int main(void) & E' n% d& w4 y
{
* C2 Z1 y) ^. O, B5 @* `2 itime_t td; : Y e) [$ B' w9 B, h2 C, ]: i9 B
putenv("TZ=PST8PDT");
5 N$ Z4 M5 e6 y) _4 j- I' ^. z% l8 h# htzset(); 8 W( K" ]9 F8 r4 v
time(&td); / I8 ], b; Q% z% `7 b+ @ w/ _
printf("Current time = %s\n", asctime(localtime(&td))); % f2 Z8 T' n3 f c! y
return 0;
. o! c4 ^+ T7 r. e$ r}