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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);
5 Z8 b8 |1 D4 p$ U, V; `}
# P, y: ^2 X: k6 Q; S5 O5 Tprintf("%s\n",string); ' f9 `( \! Q, K' x" \1 s, q8 ]
return 0;
" p8 V0 n( y/ o) `" X$ G} 2 o* d' e6 U) ?7 T3 d3 h
6 p' |( V7 m o$ p9 a
2 [# q) B+ q0 R7 ~8 G
函数名: toupper 
7 Y% X2 D" y, w& ]/ u2 D" T功能: 把字符转换成大写字母
1 g; H9 L% _$ {+ \; J. m$ B用法: int toupper(int c); $ B' T7 ~" @. S) k$ O* e
程序例: 
* ?+ k* u W3 Z. L#include <STRING.H>
, l2 x4 [3 @0 K! R; r#include <STDIO.H>& {$ \% L4 D8 a$ w& ^" O: ~
#include <CTYPE.H>. P# x" H }* Y* N3 G' p
int main(void) 7 j4 F# [1 c6 f
{ 9 {! K0 m! ~, l ^
int length, i; 6 y& O% l+ Z& g) A3 u4 ^* Z
char *string = "this is a string"; 
# A- x' Q5 |9 I2 A2 q2 \length = strlen(string);
% i- H4 ?; F1 G* J% Ufor (i=0; i<LENGTH; { 1 [1 M+ ?6 \3 i
string = toupper(string);
. N1 K0 {: Y0 _2 t+ v} 
$ d! |# N7 f% [% l: H* D8 zprintf("%s\n",string); 
. K' K# v2 v0 c5 r6 ^/ o% breturn 0; B# s4 H5 F3 b z, l# ^& I( N
} 1 H- U1 w. {, C7 r& R1 V

& S8 S4 _+ U$ ~, F1 T
3 P M; Z' @: d' j0 @3 V/ `函数名: tzset 
5 Z, B3 v- {0 F0 V; d; h1 S功能: UNIX时间兼容函数
 j( I3 K& E/ E! G9 `7 O5 M用法: void tzset(void);
; J" }) M% ]: s: @ ^程序例: : i5 d" G) J6 n7 Q8 b
#include <TIME.H>
: m4 \! q% x6 u9 g. S#include <STDLIB.H>
; Z* c- C3 S9 H$ s0 I#include <STDIO.H>9 l' ], ^; t% _4 ?% X/ n! P/ j+ [
int main(void) ! H$ f+ q- H+ s
{
& |' M+ ]2 v) `time_t td; 
putenv("TZ=PST8PDT");
: q. A" ?8 O; k: mtzset();
4 f- J V5 C$ K; ?5 m, ^time(&td);
: A' [% N1 V, f0 {3 N8 rprintf("Current time = %s\n", asctime(localtime(&td))); 7 p5 Q! t1 K: S* a% J
return 0; A7 u: r6 F6 t$ ~& b* S$ A
}