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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);
7 f/ c7 i: a6 f} ) e# ^* e' z9 \& F: X
printf("%s\n",string); }4 }' o5 Q! l5 M! v9 h# R) X
return 0; ' y; D& ~5 Q$ @9 |5 d& {" X
}
) f; U d: [7 q7 n" h: B
8 S* X5 d; a' I0 v, j
6 ?8 m4 _# q" E" |' Y; q$ _- V# Z函数名: toupper / a0 ]* B0 F$ n/ a* s+ X# W
功能: 把字符转换成大写字母
 r' d8 z: D& n$ ~4 b用法: int toupper(int c); - w% v5 b6 X" P& {4 Q" D! ~; u- v
程序例: 
" B, C+ |& o. X, Z) H#include <STRING.H>! @! O4 R: C% W: x" l2 y4 Z
#include <STDIO.H>
! Z: D3 w0 G; y9 m1 c! _#include <CTYPE.H>
4 W6 Q; b1 p" o1 Eint main(void)
# G2 p6 s) _/ G% [{
* I4 n2 m8 S. y8 i/ Cint length, i; & w! ^! G ~6 H
char *string = "this is a string"; ! S j7 |$ h: o( Z0 j: [
length = strlen(string);
& b1 w; k0 `% ^for (i=0; i<LENGTH; { * \2 v! W6 u; e; p# H1 b
string = toupper(string);
5 q( G& W; }, b0 s1 ]7 o n6 A& J} 
: e' ?5 ~4 Q5 \' K; {8 ^% dprintf("%s\n",string); 
- {9 V* ^- F# ~1 ireturn 0;
5 O4 m* i' F% y- q% ?% p9 `' G, h} 
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5 @# u' V& A' ?$ W$ F3 P
函数名: tzset : p/ [0 T8 L9 v& X* P% y
功能: UNIX时间兼容函数
8 L+ e' j5 @5 u* C8 T7 @用法: void tzset(void);
$ C2 ]0 ~6 o/ S$ A' M程序例: 
2 V5 @1 e1 ^+ X l' j( M#include <TIME.H>) V& W \: f8 w
#include <STDLIB.H>
) V, e+ n0 I1 e7 T# e6 p1 }#include <STDIO.H>
) w4 T1 q$ l9 m( a5 S& z' ^int main(void) & ~% k0 k+ C8 i2 O+ C6 p e, p
{
5 I7 R& p4 `; z- y' R2 E+ Q7 I, ^time_t td; 4 \% \$ T% y# Q6 c( r9 @ J5 O( a- G
putenv("TZ=PST8PDT"); % L0 d7 C1 N, O6 @ w' i, T
tzset();
" e6 U+ G; E2 T' R5 e5 f' E3 Wtime(&td);
& G9 o- ]% L9 J# y1 Z: b, k- g. w) eprintf("Current time = %s\n", asctime(localtime(&td))); * W# X c( K' J+ n$ ~. O, G
return 0;
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