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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);
# ^, W6 Y5 Y+ W' O. N$ a- j5 W} ( y' q1 k W! J* E
printf("%s\n",string); 
" U3 ~! o# x3 ?1 }4 vreturn 0; ; u0 u4 t+ t' r) a+ l" C8 X
} ! r- b* i! d) Y" F6 j3 P! U) W
0 u! P8 l& I9 R% R) V- e
$ R/ ~! O- Z8 x6 d& v9 ^: \: G. a+ e
函数名: toupper 
4 \7 A7 H2 G, z8 ~0 [9 k功能: 把字符转换成大写字母 ' m$ B T) S1 F" C
用法: int toupper(int c);
# f, D, |( ?4 I0 o程序例: 
( t" {2 a: z# N7 T' I$ C! d#include <STRING.H>
/ l) Y3 O9 f9 j; D1 i0 M#include <STDIO.H>
# J- M2 F- D4 u/ {/ f, F#include <CTYPE.H>
6 R9 K! `0 x% ^ Jint main(void)
. m0 ?8 l, q$ J" U9 W% G R{ 0 I+ V q: F' V( T. `) a5 o
int length, i;
$ F; J* }. n8 j$ `# Y8 Hchar *string = "this is a string"; 
& E9 u3 R2 H& ^% D" z! {length = strlen(string); 1 x. s& f, }* A4 ?! v, b& q
for (i=0; i<LENGTH; {
& T# K ~/ _& P- z0 D7 L" ?string = toupper(string); 2 d# a4 F" f5 X
} 7 V' l- c+ l; |- \* g( R
printf("%s\n",string); - U3 ^% u* \+ \+ I) z2 q
return 0;
( N2 A1 i1 A/ v R! G2 _0 t5 W} 
. o+ z. ?" y% {( {; a* ^6 T
* X+ v/ K$ y( U" u( f' |, d! D" \# N2 r* g
函数名: tzset ! e& Q3 r/ X0 J
功能: UNIX时间兼容函数
' Q' E7 ?& C8 f1 v+ W用法: void tzset(void); d/ H2 n0 j& {& r! r4 Z" U
程序例: 
; w( d% _4 g) {! ~$ p* T#include <TIME.H>% H+ w& E9 o: \, ^/ L0 @1 v
#include <STDLIB.H>7 ~ K) J1 X9 [
#include <STDIO.H>
( e' Q0 ]- e v+ Q M* wint main(void)
4 _& T+ [6 Q- _/ C{ * \1 k/ n) }# T; K
time_t td; 
0 X' N. h8 S$ N: wputenv("TZ=PST8PDT");
* |3 ^& i" d- h* v# {+ i2 Ztzset(); 8 _/ \8 q7 W5 i+ b" X+ d
time(&td);
. r8 a+ [; ]: E& Z5 Y9 vprintf("Current time = %s\n", asctime(localtime(&td)));
. |0 b. a/ p4 K" o$ ^. a5 @/ f: W1 vreturn 0;
3 l1 ^% {+ L( v1 T y) ?4 L3 @9 ]}