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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);
& b l+ s# s' h- G& |, a1 s} 4 ~% s2 \4 Q: g3 q$ u: C- B
printf("%s\n",string); # p! u3 y) l U: v5 i, r* u4 r' d
return 0; ' C; d* {; H' W: T7 f) T! ]2 U
} 7 |4 R9 j0 Y7 Y3 R& g% W- D! C
$ p$ n, G. [9 p( t

' G/ h, l9 w |, f( Q# I函数名: toupper + N' H3 Q5 }3 P
功能: 把字符转换成大写字母
/ O- W+ A! \3 _2 ?用法: int toupper(int c);
4 k1 d$ n4 G* k5 K$ i1 Z5 y* V程序例: ( E9 {( Y) A" Q& h
#include <STRING.H>
3 g/ A0 S- C/ j5 d1 c" ^#include <STDIO.H>: G: T0 q' P7 n& [- [; x
#include <CTYPE.H>
7 o# }" e8 c# J' A, }0 j. Jint main(void)
7 w; ^# w, o. _: L% s{
" C; Z& T# ?& \# \# eint length, i;
1 `; \2 V8 a5 M, {6 }7 Y" a5 Fchar *string = "this is a string"; * c: g/ z( m: [5 I! I9 x
length = strlen(string);
9 u" J6 m6 _5 X, Y7 kfor (i=0; i<LENGTH; {
9 i+ v0 B7 ?. r% jstring = toupper(string); # c. N/ U% \9 Y% B
} 
- G( R( K7 i7 v! g. v. Z' ?printf("%s\n",string); 
3 _0 S6 L I. C1 Lreturn 0;
. w( k6 X3 k2 a6 Z# L: I} 
3 s E+ i+ h4 W4 ^) K6 ?! P
0 D* K' C) I4 A' Y1 u# k! B, ?% K$ q5 m
函数名: tzset 
9 X# m, Y' e5 A' {功能: UNIX时间兼容函数
( J1 l) W; G+ [* P用法: void tzset(void); 3 H; O8 j% _. R$ Y# x
程序例: 
' i. ]- h* H0 o1 k#include <TIME.H>- t$ j: v& h8 l
#include <STDLIB.H>- c0 }% q9 k6 y( g. w
#include <STDIO.H>
/ l' r4 p( ^) Hint main(void)
9 V4 K4 O( A& p% T; k7 x0 D( ]. {! g{
5 Q/ Z* T3 @# Q; X0 {- `$ gtime_t td; 
 O2 q) j. E' d( b6 ], \putenv("TZ=PST8PDT");
5 j: V! n4 M& N, Btzset(); + ^1 K! \- [* L; [
time(&td);
0 b1 |) P3 k- M& a s- hprintf("Current time = %s\n", asctime(localtime(&td))); ' o& o$ o, h. q7 m2 n9 h
return 0;
- V- z6 d# l' u) V8 p}