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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); ! G$ T9 Q+ B0 x9 h- y: n
} 3 O9 o. R5 d# Y; b& u( _
printf("%s\n",string); 
* }) l+ F' H" e; [. Ireturn 0; 9 b& o8 R" S( m3 f& n. B+ A) B3 O0 K
}
3 P$ `) L! {( D' {+ G
3 a7 H* A" z# E5 I1 [6 T1 @) e, |8 D1 J; M, ~/ V
函数名: toupper & c/ w( ^9 [( E: c% ]7 p5 r
功能: 把字符转换成大写字母 & j& O& [/ W/ k
用法: int toupper(int c); ( d5 u/ j6 H+ v: U
程序例: 
: E& u8 K# U2 u1 p) G3 y6 X#include <STRING.H>
. Q7 S0 H2 t" b% @#include <STDIO.H>+ Q0 X, J1 j( A6 h( h" l) s
#include <CTYPE.H>* R, U# r8 G% i9 P" h
int main(void) x3 f! r! u8 g( B
{
4 i, l$ |: N. t* H @) \3 f* aint length, i; ; l. g3 {; E2 n- s5 S! |! S0 Z
char *string = "this is a string"; ; e$ n4 n/ E3 |' C, Q/ V4 h: A
length = strlen(string); 2 z7 s, ^3 O' k
for (i=0; i<LENGTH; { ) @! M/ w( H5 b1 g ~6 b
string = toupper(string); 5 D6 c' f: }& T5 q+ T$ C. w% Q
} 
$ i, G, g8 b' X: |: ?9 |printf("%s\n",string); ! q; T1 v8 b1 s, \1 j9 k' ?
return 0; ! Z, K5 Q; x1 u
} & R4 h, Y) l; w) m. m9 a

/ \* G! C9 }. P! p
& H; S$ K6 ?: e) p/ ]4 d% D3 s2 |1 R函数名: tzset $ ^$ }4 d+ G) p
功能: UNIX时间兼容函数 : V: u4 [$ L! w* n* ~8 E
用法: void tzset(void); 2 k! i- E0 E9 m3 [
程序例: 
7 K$ }, O6 ?/ }# I#include <TIME.H>2 p( v' w0 N& j) F" u
#include <STDLIB.H>8 o4 u# A7 G8 ^% Q' B) Q' z
#include <STDIO.H>
7 H9 M6 n6 M. S. b+ t# ^int main(void) , {/ B, T' d/ I0 W+ C5 a- T. `
{
2 ~( }2 I& O c9 utime_t td; 
/ z7 Y9 V: o# y4 eputenv("TZ=PST8PDT"); 2 j9 B# d% N$ }1 L
tzset(); M2 r1 |& O) A+ |. g3 g
time(&td);
5 [! b) U/ E7 @5 d' v% Wprintf("Current time = %s\n", asctime(localtime(&td))); 5 u* [3 c% n4 i: T' B7 X3 V
return 0;
* ?: g0 g, E& v7 p$ L7 `) X) I}