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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);
% n1 f0 Z2 M5 Q; L, |& o}
$ v5 `& ^# Z( X6 Xprintf("%s\n",string); 
( l" _. h( v; M7 D ^0 lreturn 0; , X6 y. Z. h1 `$ E" y
} ' }# q% L, p+ e0 m1 ^

# M s* v$ v5 X1 x8 ^+ g4 n1 ^3 c9 M4 l% G T3 O3 B& F6 W
函数名: toupper + `9 }' u- ^7 d$ B: m# r1 Q* V
功能: 把字符转换成大写字母
5 Q ~" k* U( Q z3 R0 H1 \, x$ R用法: int toupper(int c);
) Q: |7 k* j: @% O" Z/ K, s程序例: 
! A- v, A% y/ \; S8 c5 M#include <STRING.H>; x8 G1 |/ o- h. f1 v% K7 M: F/ C
#include <STDIO.H>
* o* q% U" q H: t#include <CTYPE.H>/ z3 J; A% ^$ u2 O/ J# f6 \
int main(void) 9 ]4 r( Y0 w7 Q: z$ R0 ?% z
{
% f% T& k8 [$ R7 Y: u. y& h: vint length, i;
2 P; X% b: N& [$ O' bchar *string = "this is a string"; 
# W% n6 V! C. ^3 elength = strlen(string); ) _4 x* S# f1 U1 J
for (i=0; i<LENGTH; {
7 z* o( v! @/ }# m% l x+ Vstring = toupper(string); 4 l& Z5 N6 d2 e* B% j
} 
/ p; P) y) ?' B+ ~: `0 Aprintf("%s\n",string); ! U4 t3 E- I7 H9 H
return 0;
8 B6 R/ [0 [$ e$ a! \. ^} 
( e' D+ y9 F7 b
6 c( K6 f# i' a v- L* \! D& B( {
1 f) M. P% l& ]0 W% D! ^ e; B函数名: tzset 
* [* A S2 q) m# _) I功能: UNIX时间兼容函数 , f9 j9 v% K7 d
用法: void tzset(void); 7 V! v8 h2 f, k% [) J2 V3 n
程序例: 
* j7 ^2 X9 \9 u+ d2 J#include <TIME.H>, F& q8 W) Z* z; I4 M# b
#include <STDLIB.H>
' x2 f2 y9 _0 C" |1 g7 Z9 w' E#include <STDIO.H>; H4 N0 b- H* ?2 ?9 l; z9 `
int main(void)
* Z5 n* Z7 @6 C: [{
 J8 ^! z/ i. u' [/ X4 ]# k, C$ Ftime_t td; [2 S+ v/ i4 X( y
putenv("TZ=PST8PDT");
, @, _. e R- A2 s* Ftzset(); ; K8 T6 [8 {/ M
time(&td); ' m% n$ E6 Z3 W; L$ Z3 }$ R
printf("Current time = %s\n", asctime(localtime(&td))); # A$ U6 I: m$ G9 ~9 k5 p
return 0;
+ q9 O' U7 E% E- k! @}