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标题: 函数大全(p开头) [打印本页]

作者: 韩冰 时间: 2004-10-4 02:56
标题: 函数大全(p开头)
<

align=center>函数大全(p开头)

<

>函数名: parsfnm 
功能: 分析文件名
用法: char *parsfnm (char *cmdline, struct fcb *fcbptr, int option);
程序例: 
<

>#include <

ROCESS.H>
#include <STRING.H>
#include <STDIO.H>
#include <DOS.H>
<

>int main(void)
{
char line[80];
struct fcb blk; 
<

>/* get file name */
printf("Enter drive and file name (no path - ie. a:file.dat)\n");
gets(line); 
<

>/* put file name in fcb */
if (parsfnm(line, &blk, 1) == NULL)
printf("Error in parsfm call\n");
else
printf("Drive #%d Name: %11s\n", blk.fcb_drive, blk.fcb_name); 
<

>return 0;
}


<

>函数名: peek 
功能: 检查存储单元
用法: int peek(int segment, unsigned offset);
程序例: 
<

>#include <STDIO.H>
#include <CONIO.H>
#include <DOS.H>
<

>int main(void)
{
int value = 0; 
<

>printf("The current status of your keyboard is:\n");
value = peek(0x0040, 0x0017);
if (value & 1)
printf("Right shift on\n");
else
printf("Right shift off\n"); 
<

>if (value & 2)
printf("Left shift on\n");
else
printf("Left shift off\n"); 
<

>if (value & 4)
printf("Control key on\n");
else
printf("Control key off\n"); 
<

>if (value & 8)
printf("Alt key on\n");
else
printf("Alt key off\n"); 
<

>if (value & 16)
printf("Scroll lock on\n");
else
printf("Scroll lock off\n"); 
<

>if (value & 32)
printf("Num lock on\n");
else
printf("Num lock off\n"); 
<

>if (value & 64)
printf("Caps lock on\n");
else
printf("Caps lock off\n"); 
<

>return 0;
}


<

>函数名: peekb 
功能: 检查存储单元
用法: char peekb (int segment, unsigned offset);
程序例: 
<

>#include <STDIO.H>
#include <CONIO.H>
#include <DOS.H>
<

>int main(void)
{
int value = 0; 
<

>printf("The current status of your keyboard is:\n");
value = peekb(0x0040, 0x0017);
if (value & 1)
printf("Right shift on\n");
else
printf("Right shift off\n"); 
<

>if (value & 2)
printf("Left shift on\n");
else
printf("Left shift off\n"); 
<

>if (value & 4)
printf("Control key on\n");
else
printf("Control key off\n"); 
<

>if (value & 8)
printf("Alt key on\n");
else
printf("Alt key off\n"); 
<

>if (value & 16)
printf("Scroll lock on\n");
else
printf("Scroll lock off\n"); 
<

>if (value & 32)
printf("Num lock on\n");
else
printf("Num lock off\n"); 
<

>if (value & 64)
printf("Caps lock on\n");
else
printf("Caps lock off\n"); 
<

>return 0;
}


函数名: perror 
功能: 系统错误信息
用法: void perror(char *string);
程序例: 
#include <STDIO.H>
int main(void)
{
FILE *fp; 
fp = fopen("perror.dat", "r");
if (!fp)
perror("Unable to open file for reading");
return 0;
}


函数名: pieslice 
功能: 绘制并填充一个扇形
用法: void far pieslice(int x, int stanle, int endangle, int radius);
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 midx, midy;
int stangle = 45, endangle = 135, radius = 100; 
/* 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 */
} 
midx = getmaxx() / 2;
midy = getmaxy() / 2; 
/* set fill style and draw a pie slice */
setfillstyle(EMPTY_FILL, getmaxcolor());
pieslice(midx, midy, stangle, endangle, radius); 
/* clean up */
getch();
closegraph();
return 0;
} 


函数名: poke 
功能: 存值到一个给定存储单元
用法: void poke(int segment, int offset, int value);
程序例: 
#include <DOS.H>
#include <CONIO.H>
int main(void)
{
clrscr();
cprintf("Make sure the scroll lock key is off and press any key\r\n");
getch();
poke(0x0000,0x0417,16);
cprintf("The scroll lock is now on\r\n");
return 0;
}


函数名: pokeb 
功能: 存值到一个给定存储单元
用法: void pokeb(int segment, int offset, char value);
程序例: 
#include <DOS.H>
#include <CONIO.H>
int main(void)
{
clrscr();
cprintf("Make sure the scroll lock key is off and press any key\r\n");
getch();
pokeb(0x0000,0x0417,16);
cprintf("The scroll lock is now on\r\n");
return 0;
} 


函数名: poly 
功能: 根据参数产生一个多项式
用法: double poly(double x, int n, double c[]);
程序例: 
#include <STDIO.H>
#include <MATH.H>
/* polynomial: x**3 - 2x**2 + 5x - 1 */ 
int main(void)
{
double array[] = { -1.0, 5.0, -2.0, 1.0 };
double result; 
result = poly(2.0, 3, array);
printf("The polynomial: x**3 - 2.0x**2 + 5x - 1 at 2.0 is %lf\n",
result);
return 0;
} 


函数名: pow 
功能: 指数函数(x的y次方)
用法: double pow(double x, double y);
程序例: 
#include <MATH.H>
#include <STDIO.H>
int main(void)
{
double x = 2.0, y = 3.0; 
printf("%lf raised to %lf is %lf\n", x, y, pow(x, y));
return 0;
}

函数名: pow10 
功能: 指数函数(10的p次方)
用法: double pow10(int p);
程序例: 
#include <MATH.H>
#include <STDIO.H>
int main(void)
{
double p = 3.0; 
printf("Ten raised to %lf is %lf\n", p, pow10(p));
return 0;
} 


函数名: printf 
功能: 产生格式化输出的函数
用法: int printf(char *format...);
程序例: 
#include <STDIO.H>
#include <STRING.H>
#define I 555
#define R 5.5 
int main(void)
{
int i,j,k,l;
char buf[7];
char *prefix = buf;
char tp[20];
printf("prefix 6d 6o 8x 10.2e "
"10.2f\n");
strcpy(prefix,"%");
for (i = 0; i < 2; i++)
{
for (j = 0; j < 2; j++)
for (k = 0; k < 2; k++)
for (l = 0; l < 2; l++)
{
if (i==0) strcat(prefix,"-");
if (j==0) strcat(prefix,"+");
if (k==0) strcat(prefix,"#");
if (l==0) strcat(prefix,"0");
printf("%5s |",prefix);
strcpy(tp,prefix);
strcat(tp,"6d |");
printf(tp,I);
strcpy(tp,"");
strcpy(tp,prefix);
strcat(tp,"6o |");
printf(tp,I);
strcpy(tp,"");
strcpy(tp,prefix);
strcat(tp,"8x |");
printf(tp,I);
strcpy(tp,"");
strcpy(tp,prefix);
strcat(tp,"10.2e |");
printf(tp,R);
strcpy(tp,prefix);
strcat(tp,"10.2f |");
printf(tp,R);
printf(" \n");
strcpy(prefix,"%");
}
}
return 0;
} 


函数名: putc 
功能: 输出一字符到指定流中
用法: int putc(int ch, FILE *stream);
程序例: 
#include <STDIO.H>
int main(void)
{
char msg[] = "Hello world\n";
int i = 0; 
while (msg)
% X' H; c2 d/ \% aputc(msg[i++], stdout); ' Q# B8 d1 C7 T% m* Y4 w$ J4 i4 E2 c6 e
return 0; y+ }/ N, J9 G- W
} $ r; N* O/ ~4 Y
* O i) ~3 w- C w* c9 Z# S

: R- b9 m; J" o% g函数名: putch : e3 r* O2 V) K% t. ]
功能: 输出字符到控制台 7 K8 Y( i) E4 }
用法: int putch(int ch);
+ i0 |/ S: H& b* E& o' F/ ]6 t6 S8 J程序例: 
+ O' R4 W+ m0 M2 D/ X, O#include <STDIO.H>" y8 V/ v- \" d8 k: o( i. W
#include <CONIO.H>
* c! y% t; p$ ]* Z- x- C' Y: tint main(void)
. v5 ]& f4 q% _/ t# ^5 D# j{ 0 `& @" t; G/ N+ D- O6 L) X' _, n
char ch = 0; 
- }8 A2 x! V6 o' I" y# J8 dprintf("Input a string:"); * E( k L p! m, h+ \7 m
while ((ch != '\r')) 9 J+ W. B3 C0 C' H
{ ' @5 N1 Y. ~' b
ch = getch();
7 R" J) p! `( J6 H( Fputch(ch); 9 h! N- D2 _# x5 b
} 6 w l7 \1 ]) w3 r; {! c: T& i
return 0; % n6 i+ D% y4 O8 f* ]% ~
}
/ e- p! }5 V3 n6 E
" \5 P' O' m3 p# C/ \( B
8 m6 p, S" |$ A8 `; g0 Q; Q2 {函数名: putchar 4 t; }6 u8 ^) U$ P1 h% o
功能: 在stdout上输出字符
# H# [; C- A' j a用法: int putchar(int ch);
7 l" Q2 L* W9 ]/ h2 ?5 n程序例: + c6 c9 Q: _8 o/ Q
#include <STDIO.H>
* R& [4 A# ]& s' L/* define some box-drawing characters */
3 r4 {. f- m5 [4 I4 T- C#define LEFT_TOP 0xDA * k2 [# k; p3 l5 g& G! s+ D* U2 k
#define RIGHT_TOP 0xBF 0 W- c6 ~5 Y- \0 D& F$ C8 T
#define HORIZ 0xC4
8 [% ~( ^* z4 X0 H& V#define VERT 0xB3
8 z4 Y# @: H2 E. v+ L#define LEFT_BOT 0xC0
, t( |* L9 o* k% y7 [3 m: s; ~#define RIGHT_BOT 0xD9 
0 X8 |, M/ r! W9 R$ y: n5 oint main(void) : x, S2 ~( X% E: k3 _- a
{ ! J, U/ q8 W" p% g
char i, j; ! `' I5 b4 q4 Q, y" g& B+ g" x
/* draw the top of the box */
$ N; C. L" S4 g2 k5 I. M4 M' e. E( Fputchar(LEFT_TOP); 8 e" S& t; q+ t
for (i=0; i<10; i++) 6 _( Y9 _; F6 B: f- V
putchar(HORIZ);
8 q' M9 `7 F. Bputchar(RIGHT_TOP); ( F3 `. k; T! {5 a1 {
putchar('\n'); $ m8 V6 e" U' L% h6 |* q
/* draw the middle */ / }2 N6 T0 B0 k5 f3 S2 Z
for (i=0; i<4; i++)
$ c) ~+ z8 e0 Y' n) p5 K{
5 W# x9 O$ h7 b6 Q* W4 \putchar(VERT);
5 Y( s7 w9 M3 f- p- Z% H, n9 gfor (j=0; j<10; j++) , \8 b4 _; i9 X! W; s, g: H& j- @. C) d+ w
putchar(' ');
3 J" ^9 {6 T5 O4 _+ w0 C2 \putchar(VERT);
# ^# U: W8 x$ P; P3 O2 b, @5 Mputchar('\n'); ( o3 s, Z: h! F( w9 D4 \
} 
$ b) u8 S! Z/ _; q& Y! C8 v/* draw the bottom */
' e. j: n# |% s* kputchar(LEFT_BOT); $ ^7 H$ p; V3 U) J8 H
for (i=0; i<10; i++)
5 o v8 v: q/ Nputchar(HORIZ); " b# i ~+ B% E1 ]; g" i; T
putchar(RIGHT_BOT);
9 x, W2 M0 ]7 Y$ zputchar('\n'); 
' o. V7 _/ C& Wreturn 0; / j+ Z7 u' C; v: X" z# ?
}
+ G# i) v5 L% V+ e+ h" f1 W
5 @, ], W( C# y5 T
 T+ ^6 R; G/ W函数名: putenv 
7 {5 {6 G( Q0 r3 [" W功能: 把字符串加到当前环境中 * D% W% d5 N. H% V5 h8 |( Q
用法: int putenv(char *envvar);
6 o# | l, s) Y- H/ U! w3 l7 x程序例: 
6 t, w: n$ [8 R; j' Y4 I& ?1 b#include <STDIO.H>* q. \# K6 K+ [1 N
#include <STDLIB.H>
# ]* t m: O! Y; M. Q#include <ALLOC.H>7 V/ t' E" F2 N l
#include <STRING.H>7 v% c5 N4 M8 u5 x
#include <DOS.H>6 I: J8 t7 M- m( O# y
int main(void)
/ x& z( ]% o: L8 @. L{ * ]) r9 s: W) |& T' _5 M
char *path, *ptr; - k0 m, N R. n4 ?0 x
int i = 0; , \ O0 U; B' e8 a7 D: w$ n' k/ t
/* get the current path environment */
' c$ D, ~/ d4 b- H; g5 C/ Qptr = getenv("PATH"); 
: T0 c5 k: j3 @4 l: x6 K7 ^* g/* set up new path */ 7 k3 v8 P' ^ T: b
path = malloc(strlen(ptr)+15); - A& k( Z& O5 o3 j
strcpy(path,"PATH="); . ~1 ^7 c1 C# z$ I; n& t( E1 l
strcat(path,ptr); [' ^3 N0 V8 T9 d) A+ F5 W
strcat(path,";c:\\temp"); 
* m/ l8 u' x% c* M! k( ~! s& l: o/* replace the current path and display current environment */
' i5 Y1 u8 M/ T2 nputenv(path); * f9 t# L& T* j& F9 I* U
while (environ) 2 S. g; F# m+ q0 m% h; h7 D: B
printf("%s\n",environ[i++]); ! \5 Y# ~* L) |) I2 j
return 0;
. f0 k( V6 B4 t' y' R( Q}
% X: G7 b+ M" K# K# W) U/ ^& x
7 w- m6 I- |: x6 J1 m* f
. }- ~( r7 H( `1 F& e! v4 w函数名: putimage 9 f( N) `5 {$ P) Y5 O4 Q
功能: 在屏幕上输出一个位图 ) K1 u2 h! p. L' i
用法: void far putimage(int x, int y, void far *bitmap, int op);
# b- P) V4 O N( |. S0 W程序例: 
$ ~' {8 L* O: d#include <GRAPHICS.H>% j v; \9 A1 h# s2 ]8 {
#include <STDLIB.H>
. s. @/ ^: @* ?% B#include <STDIO.H>: G* X9 M' }' e1 R
#include <CONIO.H>0 ^0 G! R( b# H5 n1 j5 f" N- D
#define ARROW_SIZE 10 
7 L2 ?# ~7 V. q9 A) i* M- Avoid draw_arrow(int x, int y); 9 {- E- f1 L; s/ I0 m4 q3 C: a( `
int main(void) J0 z( o+ g3 e
{
% b7 T a8 z3 h ?) Y' ^/* request autodetection */ - t$ a: |4 Q. E0 r. c
int gdriver = DETECT, gmode, errorcode;
- g; ^% V$ P$ Yvoid *arrow; $ Z% I- V a$ o0 l6 }3 E6 Q: m/ w) @2 F
int x, y, maxx;
7 h+ A' T( Q' m# |! eunsigned int size; + p4 \+ V% L0 D0 j
/* initialize graphics and local variables */ & s4 E$ H6 I, @: _
initgraph(&gdriver, &gmode, ""); 
9 r8 B; i6 c# v! b( V N- q2 b/* read result of initialization */ 5 @& G, s* U. y4 M/ \
errorcode = graphresult();
$ X7 I$ \% W! D$ Bif (errorcode != grOk) /* an error occurred */ * p L( d8 q+ }1 z% V
{
/ |5 W- ~: B* }6 U4 a' yprintf("Graphics error: %s\n", grapherrormsg(errorcode));
% l4 U4 ?& u' x2 Tprintf("Press any key to halt:");
3 \9 o8 ]( d! agetch();
8 V+ G6 f0 u/ G6 }6 Xexit(1); /* terminate with an error code */
0 u( H* h9 s( W} 
! l5 p: L5 N% @3 b* P: omaxx = getmaxx();
6 L. c @, y: N3 `0 Ax = 0; n8 \/ `% ?. ^" i1 T! f# S/ X) P
y = getmaxy() / 2; 
: O! o. u( N2 U+ y; w$ r/* draw the image to be grabbed */
5 m3 H d# f7 @1 P! \draw_arrow(x, y); 
4 ~/ d3 G3 G0 k1 R, p6 ^/* calculate the size of the image */
5 T$ O/ n. x9 g6 n# |size = imagesize(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE); 
$ B4 q+ d; Z* `% o& u. i1 N* X/* allocate memory to hold the image */
5 g$ R- l6 u B: z! V# darrow = malloc(size); 5 I9 I7 M! ~0 p- E6 @
/* grab the image */ % L/ y- h6 n2 f% P% j2 o
getimage(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE, arrow); 
' X9 O4 p' q& K4 Z% ~/* repeat until a key is pressed */
5 u! ?* L( i8 x! Dwhile (!kbhit()) 9 W! @2 E% Q( t
{
, a. N% U3 a7 t6 Z" G$ N" b/* erase old image */ 2 N1 o2 O, ~ a! c9 p" z% v
putimage(x, y-ARROW_SIZE, arrow, XOR_PUT); }3 ^5 K1 i; B, D$ L' N
x += ARROW_SIZE; ; m) E6 K$ G: x, _1 Q/ ~
if (x >= maxx)
* ?4 J, p9 s# bx = 0; $ [% u; i5 F# Y% s
/* plot new image */
0 A8 n( c( t3 Z' {! ], n; Q6 e5 h3 aputimage(x, y-ARROW_SIZE, arrow, XOR_PUT);
/ h6 o2 z* A( }( b( p3 j* w% ~} ' V$ E- p3 h' K2 e# s5 d6 e
/* clean up */
 E. @2 H1 X5 P" ?7 v. X9 D# h/ kfree(arrow);
) f0 O0 p& ~1 s: ^- xclosegraph(); 7 s! E3 E' t7 n: ^3 J
return 0; H. t/ }' n# a
} 2 u" R6 q' u. X0 C- B
void draw_arrow(int x, int y) % J5 ^3 h2 |. y" i; {
{ 3 K/ \0 ~# }9 h0 u$ z0 r& F
/* draw an arrow on the screen */
% ]* _0 s6 S; j- M, gmoveto(x, y); % M, q. r5 \' E8 P8 V& ^* h" K
linerel(4*ARROW_SIZE, 0); $ `- p% }% z. p$ ^2 W
linerel(-2*ARROW_SIZE, -1*ARROW_SIZE);
/ _' H; o2 O/ ~linerel(0, 2*ARROW_SIZE);
" @5 e" @* z+ X- \0 A' C; X( }1 slinerel(2*ARROW_SIZE, -1*ARROW_SIZE);
6 k4 i+ [* s" r3 M}
. L% t, k' a0 ^4 F. K7 S
9 N6 M) C' d9 z! T/ T; l( g) q
函数名: putpixel 6 A7 }& U V% ?" C
功能: 在指定位置画一像素 . C3 d6 \3 p/ {/ Z! Z* j
用法: void far putpixel (int x, int y, int pixelcolor);
程序例: 
( O G' t5 d7 Z6 a- N* C# m#include <GRAPHICS.H>) p1 c; r( w. i" a% X* ~0 k% z
#include <STDLIB.H> u6 s5 V* [4 n( ~5 L' @; {
#include <STDIO.H>
: f. e3 p9 l9 A#include <CONIO.H># h+ L) t" z. S
#include <DOS.H>' n2 G* Q' e7 R; y) p \
#define PIXEL_COUNT 1000
& b* h, J# j. z. ~& K) F# d) g5 F5 `#define DELAY_TIME 100 /* in milliseconds */ : I" }0 i4 n2 O; d1 {
int main(void)
5 k; j! a, f0 Z; {( `9 c j z& R{ ; D0 _ @/ J$ b- c# n9 C
/* request autodetection */ , x! I( v2 |1 v4 S2 ?1 g9 x- a
int gdriver = DETECT, gmode, errorcode; ( P Y N3 H9 B# a2 |) _% r+ P
int i, x, y, color, maxx, maxy, maxcolor, seed; ; _/ y+ a. S) B* [; p
/* initialize graphics and local variables */
/ T% x( c# u- j7 I/ W; X3 Minitgraph(&gdriver, &gmode, ""); & f( @( b! Y, p) v
/* read result of initialization */
% G+ r( y$ W4 v: J5 e& V' Serrorcode = graphresult(); & K6 `8 U2 H3 K8 u3 o- I
if (errorcode != grOk) /* an error occurred */ 7 c6 N. s* O2 O( e+ g; k
{ ; {! R4 \& q% h( I
printf("Graphics error: %s\n", grapherrormsg(errorcode));
5 S& ]7 x& ]9 Q) B# c8 `printf("Press any key to halt:");
3 p/ G9 K( e% Ugetch(); 1 G6 N& p A/ r) q
exit(1); /* terminate with an error code */ 7 @: V# s3 h1 P4 F
} 2 u) A- D$ k. N" L; w! E
maxx = getmaxx() + 1; & H+ x2 g3 c& f) G
maxy = getmaxy() + 1;
" y$ a7 K% O8 j' w, Jmaxcolor = getmaxcolor() + 1; 5 T4 P. m) F1 u' |: I: r6 g
while (!kbhit()) 2 r; C8 G6 |3 X
{ ! x% g. s% r& q# B& v% M
/* seed the random number generator */ 7 x/ {& X/ D4 }0 ]
seed = random(32767); & N) b+ G4 v' E9 Q# z
srand(seed);
* ]1 C- M# z1 Y) tfor (i=0; i<PIXEL_COUNT; {
, O" ?; M" C8 {6 k H3 @x = random(maxx); 6 Y) y% o1 ^% D4 G( S* ~' A
y = random(maxy);
4 v' C% X0 l8 w$ Ucolor = random(maxcolor); / s5 B# \% }! x$ h
putpixel(x, y, color);
1 G( H( P5 V3 q- H' Z} 
5 f( k! v. D' j8 s4 |/ [delay(DELAY_TIME); $ v$ E/ P; N; g( ^( Z
srand(seed); ) f' H0 s) T2 J4 O& h
for (i=0; i<PIXEL_COUNT; {
, R* E8 Y2 H8 S3 s4 Ex = random(maxx); 6 Z. R) |3 w1 E
y = random(maxy);
 }2 m. w P+ D1 mcolor = random(maxcolor);
5 e" z; d; s$ @ {if (color == getpixel(x, y))
) E2 M- ?- W3 \" V" ` ]putpixel(x, y, 0);
9 Y: l7 {5 X: c1 w} 0 Y0 a E! x9 d0 w' c# {
} 
: x0 T3 K% z t2 t/* clean up */
0 |: G5 B7 ~5 z; X( [9 [getch();
' X. V1 ?9 f8 G: y S: h2 Dclosegraph();
* X, S; y0 F6 S0 v' T! dreturn 0; * Q; K7 q* W x7 M) P" ]- m7 q
}
" L; T4 S$ T" O3 `9 m
; {. y1 H4 [0 A& I# a* [, Y, q. _% C# h8 j$ }, l
函数名: puts 9 h. [: c% n5 ]) p. D
功能: 送一字符串到流中
+ ]% u0 \" \! C: l1 }用法: int puts(char *string); ( K4 P* r3 |: U# a+ x+ \
程序例: 
& N, ^$ c* i6 K* m8 r ^#include <STDIO.H>4 n5 \$ y1 S9 m9 v" T
int main(void)
3 L. ?' c' ^- @+ n{ & N1 u% {# l2 A" X( t. Q
char string[] = "This is an example output string\n"; ! X; L$ m5 j3 T1 ~4 U
puts(string); + h+ Y4 s0 ?2 C# ]' D/ f0 `
return 0;
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( ^) ~* y, S3 t8 D w0 \9 m3 t% o1 P; e/ |) |
函数名: puttext 
6 N* U Z F6 y功能: 将文本从存储区拷贝到屏幕
% w, L9 V. e' s用法: int puttext(int left, int top, int right, int bottom, void *source); , x( B" h2 N1 p( ]% Q" Y/ `- ^
程序例: 
6 k* O1 r5 ?) F4 X3 E [7 i#include <CONIO.H>9 h/ N5 d- W$ ~" K4 N; r
int main(void) * s: |& A2 y6 \+ S, W8 ]' y" @* n
{
5 c2 E# [* V! dchar buffer[512]; 8 b! c( X) w) j: [ V+ b
/* put some text to the console */
$ x+ L' l. X+ S8 L" h0 P0 r6 `9 pclrscr();
) Z' j; _ K8 @! [2 Igotoxy(20, 12); ( G$ ~" |' s0 T% b: ^
cprintf("This is a test. Press any key to continue ..."); 0 E- ~, v7 m; C
getch(); ( P7 ]) l0 c5 `# a9 A1 w
/* grab screen contents */ ( a1 @: w. E: f. i
gettext(20, 12, 36, 21,buffer);
& D7 |& O9 ~4 b; n$ H# W8 k1 h( uclrscr(); 
$ e0 x3 l& r3 A& t: K# r/* put selected characters back to the screen */ + Z R9 p* @5 h- C4 n1 O" @
gotoxy(20, 12);
/ i- G! B% E: ]4 N; [' n; b# wputtext(20, 12, 36, 21, buffer); 9 P+ t, O, C6 P
getch(); $ d2 h4 Z/ |! G% X& Y) j; n
return 0; U" K& X% w6 E
}
% `( y/ M/ d! N/ @; ~# i0 y6 d" ]0 V/ i+ y S+ m+ j' W, R4 W
* m/ V" |4 V2 I( u( P
函数名: putw 8 w8 m4 }& T t5 H: U# n M: O
功能: 把一字符或字送到流中 7 `! `7 S$ f' V5 r5 y; [9 b/ A
用法: int putw(int w, FILE *stream);
3 a. y2 t$ N* Q! X* @2 u, [/ i$ w程序例: 
/ z; n; L7 I Z2 f7 k( Z: H#include <STDIO.H>3 d) l3 S) }$ t: O6 g1 n
#include <STDLIB.H>
2 x- y* ~- C% f" Z#define FNAME "test.$$$" 
7 R8 A# L) s; I9 R5 pint main(void) - C$ P* E0 {9 l) |) u7 l* e
{
 {$ e( _# j5 x0 u! n: B5 ZFILE *fp; ) g, q; R' C1 X. z( [
int word; 
* k& f% S8 o" x: H/* place the word in a file */ ' Y6 I7 M1 F$ b4 @$ h: a' N8 Y! u! J
fp = fopen(FNAME, "wb"); ; n9 A3 \) H7 ~0 t- Q z
if (fp == NULL) 5 p1 @/ ~; T0 K/ K& u7 ?1 q3 p
{
# e3 s' g1 l; z" |" k5 E, Kprintf("Error opening file %s\n", FNAME); 4 W" h; ^% o' l8 d- |! M8 Z: S" w
exit(1);
4 M ?) Y) n7 m& m+ v2 {3 S} 
3 f% _1 a( S# z% D1 uword = 94; ) E# F. N4 H- b8 f# w* }
putw(word,fp);
4 f+ q$ B! C+ Zif (ferror(fp)) ) N9 S" f1 k; F& K2 |$ w6 B/ i
printf("Error writing to file\n");
' @& e/ U# @% k" j( n7 @else
 m8 U* [! S! eprintf("Successful write\n"); 6 }* \' Y# ^( G: h
fclose(fp); 3 e% z; H4 v9 Y4 f( t9 L( ?
/* reopen the file */
% j5 o' o- o/ e; ~( X6 ?fp = fopen(FNAME, "rb"); & d8 r9 }# f0 P6 Y* X
if (fp == NULL)
1 r/ K8 c, y) W! X1 p{
" `, Z" |- z; T# L# H5 pprintf("Error opening file %s\n", FNAME); 7 b0 {2 P7 s$ S9 R
exit(1);
' L; ?0 F5 z5 {1 _; k. ?( h) Y} T/ E t) i. G
/* extract the word */
* g9 e5 J3 {" e$ f3 h0 `5 y/ B! zword = getw(fp); : r, V e* T( J8 b
if (ferror(fp))
" C- S' o( D8 P, ~+ Z$ R. jprintf("Error reading file\n"); . ]/ F3 @( p8 R
else 5 T4 G( \# E" |% R4 |: f
printf("Successful read: word = %d\n", word); : E9 X! T. j9 Q5 h2 ?0 y, T
/* clean up */ + @* i6 w1 v9 O( e q3 ^
fclose(fp); ) K+ y4 z/ B: w* z% z9 c% C4 h
unlink(FNAME); 
/ B2 y( p! T# n" J6 M* areturn 0; 8 G: S) R; c9 [" [) |7 ~4 E
} 

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