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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);
$ n+ R3 @5 ]% ~} $ b+ [) J: p7 m5 F: T2 @
printf("%s\n",string); 1 T/ `/ m; @& E, U4 X* v
return 0;
; ~9 X. n2 G" J+ @, S b0 ]}
" o8 j# b! ^4 {0 q( r" w3 C( G
# I- N) |9 d2 I
/ @ p3 I# T2 Z1 j3 @, _5 m; A ^函数名: toupper + a2 W* u6 p4 {4 k
功能: 把字符转换成大写字母 / @0 Q" K$ s( P( |
用法: int toupper(int c);
# g( T6 S! U9 }) m) Q程序例: 1 A5 q9 V( d1 O
#include <STRING.H>
& n" d2 {" h+ }. h7 [#include <STDIO.H>7 l+ n/ Y# y* R6 i
#include <CTYPE.H>
9 S8 @' K4 |+ J) E. ~" Q" Hint main(void)
' f6 n2 L- F) b! G$ d: D8 V{
8 V- Z: Q) ~) @$ {3 `+ z* Qint length, i;
% M* y2 j7 _6 }2 Q/ ?char *string = "this is a string"; + ]) W) f3 n/ e
length = strlen(string);
! C6 h( y6 Q3 R, e5 k+ Q7 d5 Yfor (i=0; i<LENGTH; { $ I% b: E" E4 w$ V& \
string = toupper(string); X2 r# N+ }* I- v1 Z$ b6 O/ k
} 
, @0 |; F* m! Y* W. M# N' T4 H! Eprintf("%s\n",string); 0 M5 M! @3 g# G8 ~$ P. K5 }: A
return 0;
3 R5 x% [+ @3 O, A Q' H} , D* l0 O" {2 m* Q- e4 o

& x" v1 ]6 @6 W3 U- T* y8 f4 w; o3 p* I% T: n
函数名: tzset 
* o% {5 Q! n4 e. S6 c# S' p功能: UNIX时间兼容函数 2 u9 ^2 b5 M8 Y9 L
用法: void tzset(void); % {; c! e9 p% Q: b# p7 t0 q4 \
程序例: 9 [& h9 N K1 s* G9 }$ }$ f4 P. e
#include <TIME.H>4 l$ S: d7 L5 g
#include <STDLIB.H>
7 `0 E# C- f" s9 g. L& S#include <STDIO.H>
9 i: O4 n# e& X' Sint main(void) S' V8 p8 u- f1 Z/ N2 B" m& h
{ ; Z G. B; N2 V0 d( U
time_t td; 3 z( g. n3 k& ~
putenv("TZ=PST8PDT"); 4 D7 s+ M; ^. w9 \
tzset(); 7 y: }$ A- P+ R
time(&td);
* k/ \ f0 y) @+ S3 Y3 o9 dprintf("Current time = %s\n", asctime(localtime(&td)));
7 }% g- E1 U6 V) Wreturn 0; 9 E( |. a5 u4 b* [6 U
}