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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);
9 m6 L# r9 w. z4 `1 _6 {6 t: w}
; M. T$ R# D( v+ d( gprintf("%s\n",string); 2 g' [' y( B; k
return 0;
% @5 N- _$ P2 ]2 i% [} ) B0 ^+ g6 @- `/ |9 q+ h
. A+ ^( \4 q8 V8 w. \

2 o5 ^* e3 W _- S, y' |7 @, q+ ?函数名: toupper 
! k) F. J3 H& Z功能: 把字符转换成大写字母
# q+ b: m. ]- U. i用法: int toupper(int c); # Z1 y9 J) L4 i! u' A1 Q
程序例: / F* }+ q6 k8 Y- G; V
#include <STRING.H>
* I+ A9 }, i/ p; J! m* n" {. I+ ^#include <STDIO.H>
! F7 H' t5 L* H- o2 ?#include <CTYPE.H>
0 V; P- [! X, z, b1 N) w0 K5 w; jint main(void)
3 S2 E- ]+ f0 k9 r4 P2 k{ 2 M& B! o# }9 r9 Y# t
int length, i; . x# G, A, s+ u' K( c' m
char *string = "this is a string"; 
+ R) r& o. N' Z: B! Ilength = strlen(string); 3 d7 A/ Y' i" j3 L/ c) j
for (i=0; i<LENGTH; { 3 j; W7 i' d. m% R8 J9 q5 k
string = toupper(string); 6 d5 O( |9 T& `4 k
} 
 @! j! T! {8 ?7 y6 P& X6 h$ h2 qprintf("%s\n",string); % o: X$ s" a. o, Q7 l
return 0;
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% s! |& E" t' t
3 Z+ Z7 l$ V# a F" h: {' K
函数名: tzset 0 _( n V0 ]3 h1 {
功能: UNIX时间兼容函数
* O/ a4 }# h/ F: v: `6 l用法: void tzset(void); 6 t/ ^, l" A9 `' u
程序例: 9 }% E1 Y/ u. Q+ x( S( g& V
#include <TIME.H>
# g' }( W# h3 h6 L#include <STDLIB.H>- R6 Y! U/ q( ~4 p3 z+ b+ }
#include <STDIO.H>
' w7 k% T A4 Dint main(void) & j' L9 O% c8 ^4 |# g0 a7 L h3 b3 r
{ - s0 o$ E- N- i
time_t td; 
7 B* C" U c+ y( Wputenv("TZ=PST8PDT"); 6 l: S; W0 f- K3 b4 o8 [; o- h/ ^
tzset();
) j; w: h! |! F) \time(&td); ( o$ T4 G$ I b4 {5 L- ?5 k
printf("Current time = %s\n", asctime(localtime(&td)));
% O4 \6 ^' I$ |( Dreturn 0;
4 J# e3 B% {3 ]2 n/ q}