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发表于 2004-10-4 02:54 |只看该作者 |倒序浏览

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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);
# r( f/ ]0 r' Q F$ f5 K} % \: Y) ^ l( P" g' w$ M, z* Z |
printf("%s\n",string); 
( e/ D* W" z7 E& c ]$ Breturn 0;
6 m' s0 X5 n4 G; q4 ^} ' F- s6 ^$ I* x& f3 m7 K
 M w& a8 i$ C. K9 o9 |3 m1 A

: o4 L# n- c5 I& n函数名: toupper 
! B) R: ?8 P2 j) o( W功能: 把字符转换成大写字母
# k6 L. n& c, m9 m5 c用法: int toupper(int c);
. O$ Y$ y0 B' M7 I/ @' b- o程序例: 
4 n' w1 a2 c% z6 d% {#include <STRING.H>. e) y( o& F' \/ C5 I
#include <STDIO.H>
$ C) W, e5 b: M5 |#include <CTYPE.H>
/ |% {/ I( a4 c7 p& v- q6 }int main(void)
2 D8 I; \% h5 J1 s! ?{
 v( t. J4 {' n- Wint length, i; ' B G! c0 D" ]0 L0 L" [# w
char *string = "this is a string"; & Z( p; E* H/ ^& t
length = strlen(string); $ k/ d- t. w$ V; U
for (i=0; i<LENGTH; { / T# a1 B. Y; p- U8 V: B
string = toupper(string);
' A0 A3 c' U: W1 [0 m7 m" D. i} 1 p6 D! f9 ]8 v
printf("%s\n",string); + [5 k4 R# X3 W! ]
return 0;
3 L! ?; b( u7 G} - W! j9 b s8 ^& k
7 D7 Y" K* |- l
; \$ X1 V$ S1 k- y8 s
函数名: tzset 
6 b8 k0 s1 I+ ]1 n% C9 ]功能: UNIX时间兼容函数
9 y& u% ~. D' U& x. X9 m1 R/ X用法: void tzset(void); 1 k) }1 V$ o4 @: \& e1 ?
程序例: 3 h6 W. y" S: P+ o% G, X& A8 K
#include <TIME.H>( W: `, L- c" `( Y% X2 R
#include <STDLIB.H>
+ q1 c9 s5 a! ~- U" s9 ^. T#include <STDIO.H>
: a; R% Y. B5 Y" b" z* ^, B% @int main(void)
' ?9 t0 A- ~/ q9 C; z* Z# S{
8 Y1 O" ^9 G3 C5 E/ |# n. |9 U7 {time_t td; 
. t+ k! J& J& ^0 K! n4 \putenv("TZ=PST8PDT");
9 x! z! o" [ k4 g% i& V, }tzset();
9 C+ M5 Q+ |5 L; H5 [ t- n* htime(&td); + O) ?6 D& e# G9 j: |7 k6 b
printf("Current time = %s\n", asctime(localtime(&td))); 1 l0 F7 \! F4 G+ v2 n3 b& G- O) U; Z
return 0;
# G. b T* B3 Q, x}