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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+ } c1 m% c$ M" U
} 4 c S0 k& q8 J* H
printf("%s\n",string); 4 o4 N+ t% R9 M9 F. g& P9 q
return 0; B$ Q1 g+ ?( c9 B# B) D1 Y$ z
}
$ u. O; S0 c; `/ u# h2 L+ N- `# j
" u2 l$ D/ ~# E- ^
7 p1 o. w7 \1 c( b函数名: toupper ( A i3 t4 D4 |0 J* M
功能: 把字符转换成大写字母
% ~( z: M# i X用法: int toupper(int c);
" T. c- w; h8 t3 k程序例: % F4 O. n% Q* k( h: m
#include <STRING.H>( u7 k- \; Q% o A* L
#include <STDIO.H>
1 M4 H z) c$ a" r6 C' \: W' ]#include <CTYPE.H>6 k" x9 d, r$ M' S* d
int main(void) # y% i+ b% N/ F; m% X
{ - ^$ ~2 N4 q3 ?# Y) w
int length, i;
2 m# k6 }& u$ n3 H6 q) Q4 ichar *string = "this is a string"; 
3 n7 D Y% {) {+ g. V- d* Alength = strlen(string); : ?) F6 |" }8 D4 r: ~3 o0 @
for (i=0; i<LENGTH; {
. U! }! X# D7 J# e& f% Estring = toupper(string); 3 k2 E, N* C. g: s
} ' D5 {3 ^4 |: l
printf("%s\n",string); 9 N- n( |! s! ]2 |7 r# ]! \
return 0; 0 e6 F/ t& z- I9 {. t
} , T# }& O" H9 j
; d+ O3 I) _; U, \

9 D3 P: u; b$ ~函数名: tzset 
 q: W& k5 k, y" x6 m: ]* A功能: UNIX时间兼容函数
+ N+ L6 m) A1 C: i& i; [: t用法: void tzset(void); . P. P$ a3 Q" j# ]: _
程序例: 
6 m4 R2 ~8 I5 |/ q#include <TIME.H>
. M& m4 [+ W0 k7 Y9 C# L#include <STDLIB.H>
! \% K! p' t6 j#include <STDIO.H>. |8 j' r! |- t, ^, E& ?
int main(void) - z1 ]8 C! c7 [5 N3 N
{ * O( _6 ^! L& ]5 X% I& x
time_t td; 
2 i% l0 s' M6 D Tputenv("TZ=PST8PDT");
2 O0 X3 B8 n' Ztzset(); & b7 g: ~; C& Z) C
time(&td);
# F' V" W, ^- U, Nprintf("Current time = %s\n", asctime(localtime(&td))); 9 {$ G ~3 k( `% G
return 0;
" f, c Y1 X1 ?}