数学建模社区-数学中国

标题: 函数大全(t开头) [打印本页]

作者: 韩冰 时间: 2004-10-4 02:54
标题: 函数大全(t开头)
<

>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);
 k) E L3 k1 W}
2 v0 q/ H( }& @% R9 c# pprintf("%s\n",string); 
return 0; / P( ^7 C" W. T. m
}
( G9 @* g j2 P1 o! ^% j8 @+ q3 V
0 @# l5 I V' a+ F0 w6 A" \
函数名: toupper 
' N* @) y- s% A2 I功能: 把字符转换成大写字母 & O: ]; a! V% T5 s5 w
用法: int toupper(int c); 8 b, s; p* |& U( c4 ]& `5 z
程序例: ! T/ i# y6 K4 f# H
#include <STRING.H>
0 |3 {* i8 |# }, b#include <STDIO.H>: t; O. \9 N. P4 {
#include <CTYPE.H>
! o: f T/ j: N' ?: q% xint main(void)
- C7 [) z, D/ {# B7 j+ {& I{
, x# y, v& R1 n; T& Q1 }: uint length, i; ( G4 K1 w8 i, U l6 q5 D
char *string = "this is a string"; 
0 p( n( L3 }/ h- S7 s ?# }length = strlen(string); % X+ n4 w6 Y- G" N
for (i=0; i<LENGTH; { b0 s4 H/ M3 a$ N5 i. B
string = toupper(string); 0 @' _. y$ [5 R2 {. U' ~
} ) o" y2 K, e5 V) R6 t5 q
printf("%s\n",string); 
1 }/ @5 E; l+ \! P* ?0 Y! Kreturn 0;
! v' ~# m# R. R' m! W} 
" c+ C% |& c4 Y8 L7 Y1 f3 E
$ \( |$ G. D, z Y: d: T7 z" r7 t2 v- B+ x
函数名: tzset 
" B- B- Y7 S- U8 ~1 a# o功能: UNIX时间兼容函数
' o; T) O: y. u) V3 i用法: void tzset(void);
; \ [8 r0 M8 `3 s3 |程序例: 
8 a, A' a% Y C8 t' w* j- S#include <TIME.H>
' @2 N6 M% v) q5 g3 K; s/ l; G#include <STDLIB.H>
% R; }9 u1 F- j7 |- J#include <STDIO.H>
0 x' i8 V7 w9 e* Vint main(void) ; ]3 o7 Z. s0 T- z3 i
{ & ~8 b5 M$ s) U3 k% [) G
time_t td; , F9 R: L. _" b3 D
putenv("TZ=PST8PDT");
. r% ~* D# B- Y7 h( `& c1 C. ]tzset();
9 w8 c2 I% i( s4 V4 L* btime(&td); ; s, U7 R& w" B/ `0 v
printf("Current time = %s\n", asctime(localtime(&td))); 6 K2 R h9 w# Q. O5 L) q: c$ Y
return 0; , n8 l. n/ f1 y
} 

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