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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); 3 l) F8 j/ a: }9 e6 t& ]+ |
} 7 d" D; O6 O# k; m: E
printf("%s\n",string); 
 d. d6 Z, J; U+ H9 A) Jreturn 0;
! C8 M5 X. S& U @' Q( t0 A) Y# I}
" l3 M3 p+ `4 L3 D7 q0 B9 x/ q0 g' B/ G, O( ]& Y$ N4 w
 ^1 K8 |2 u3 V G! S
函数名: toupper 5 @! J: r, `/ M4 h9 G& ]
功能: 把字符转换成大写字母
% W p2 r# X* c* |8 t5 @用法: int toupper(int c);
+ w' o8 e7 [9 \% Q3 \7 i0 I程序例: 
& q5 M& y7 x, @4 m#include <STRING.H>
; s" f3 o3 B/ _5 T2 y/ B6 |4 S! @#include <STDIO.H>- o5 B' {* A0 c9 ?
#include <CTYPE.H>
" \0 o1 s5 r; g( e# cint main(void)
" S7 v& X/ Q1 Q6 z4 A; P{ . L. x. [- Q- W, O) U7 y* A- [
int length, i; + o7 Z7 i! B5 S% Q1 \- z& O
char *string = "this is a string"; + o! y1 f9 `% O: E0 s5 t- l, Y1 {
length = strlen(string); + x8 E( N! [0 O9 y
for (i=0; i<LENGTH; {
: V) @# s1 b# r, F/ kstring = toupper(string); / h$ t/ X$ C: g6 L; D
} 
: ^$ m- I( y- p, s2 cprintf("%s\n",string); ; d1 J( B6 o4 y; T3 W
return 0;
% o8 m- V1 j! ?; @) P3 C/ u* t9 s} 
% A7 }2 J8 c0 ^% f" V) T( c7 w3 V0 T. f

3 p( F" x6 X3 a7 ~ j: E, k函数名: tzset 
3 M) Y0 e" P' ^" x! B0 M功能: UNIX时间兼容函数 r3 }( U$ A# w+ G) {
用法: void tzset(void); - S8 k, Z! ^- g6 I7 u* B: j
程序例: ) @* \( ~! z4 s: `
#include <TIME.H>% [' y0 }- r/ j8 o" \
#include <STDLIB.H>. e/ x& C8 R- q$ r6 }
#include <STDIO.H>. K0 V. h2 L& X. D1 }3 q' ~, d
int main(void)
: ]& _; r% |& V+ E" O. w{
' R- K: p: f3 f+ Y) k1 ~time_t td; 
2 l# |) y" X) c4 Nputenv("TZ=PST8PDT");
% k. r4 F( D3 }; c1 n7 A4 D( m7 ytzset(); : ?, O7 O, p; S
time(&td);
7 X8 E4 j! D1 f7 ^5 m1 ]$ ?# uprintf("Current time = %s\n", asctime(localtime(&td))); & G( m2 Y1 {* T, N& m+ C1 W) U3 D
return 0;
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