O類字母

函數(shù)名: open?功?能:

打開一個(gè)文件用于讀或?qū)?用?法: int open(char *pathname,

int access[, int permiss]);?程序例:?#include

?#include

?#include

?#include

int main(void)?{?int

handle;?char msg[] = "Hello

world";

if ((handle =

open("TEST.$$$", O_CREAT | O_TEXT)) == -1)?{?perror("Error:");?return 1;?}?write(handle, msg,

strlen(msg));?close(handle);?return

0;?}

函數(shù)名: outport?功?能:

輸出整數(shù)到硬件端口中?用?法: void outport(int port, int

value);?程序例:

#include

?#include

int main(void)?{?int value =

64;?int port =

0;

outportb(port,

value);?printf("Value %d sent to port

number %d\n", value, port);?return

0;?}

函數(shù)名: outportb?功?能:

輸出字節(jié)到硬件端口中?用?法: void outportb(int port,

char byte);?程序例:

#include

?#include

int main(void)?{?int value =

64;?int port =

0;

outportb(port,

value);?printf("Value %d sent to port

number %d\n", value, port);?return

0;?}

函數(shù)名: outtext?功?能:

在視區(qū)顯示一個(gè)字符串?用?法: void far outtext(char far

*textstring);?程序例:

#include

?#include

?#include

?#include

int main(void)?{?int gdriver = DETECT, gmode,

errorcode;?int midx,

midy;

initgraph(&gdriver, &gmode,

"");

errorcode =

graphresult();?if (errorcode !=

grOk)?{?printf("Graphics error: %s\n",

grapherrormsg(errorcode));?printf("Press any key to halt:");?getch();?exit(1); ?}

midx = getmaxx() /

2;?midy = getmaxy() /

2;

moveto(midx,

midy);

outtext("This

");?outtext("is

");?outtext("a

");?outtext("test.");

getch();?closegraph();?return

0;?}

函數(shù)名: outtextxy?功?能:

在指定位置顯示一字符串?用?法: void far outtextxy(int x,

int y, char *textstring);?程序例:

#include

?#include

?#include

?#include

int main(void)?{?int gdriver = DETECT, gmode,

errorcode;?int midx,

midy;

initgraph(

&gdriver, &gmode,

"");

errorcode =

graphresult();?if (errorcode !=

grOk)?{?printf("Graphics error: %s\n",

grapherrormsg(errorcode));?printf("Press any key to halt:");?getch();?exit(1); ?}

midx = getmaxx() /

2;?midy = getmaxy() /

2;

outtextxy(midx, midy, "This is

a test.");

getch();?closegraph();?return

0;?}

P類字母

函數(shù)名: parsfnm?功?能:

分析文件名?用?法: char *parsfnm (char

*cmdline, struct fcb *fcbptr, int option);?程序例:

#include

?#include

?#include

?#include

int main(void)?{?char

line[80];?struct fcb

blk;

printf("Enter drive and file

name (no path - ie. a:file.dat)\n");?gets(line);

if (parsfnm(line,

&blk, 1) == NULL)?printf("Error in parsfm call\n");?else?printf("Drive #%d?Name: s\n",

blk.fcb_drive, blk.fcb_name);

return

0;?}

函數(shù)名: peek?功?能:

檢查存儲(chǔ)單元?用?法: int peek(int segment,

unsigned offset);?程序例:

#include

?#include

?#include

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;?}

函數(shù)名: peekb?功?能:

檢查存儲(chǔ)單元?用?法: char peekb (int segment,

unsigned offset);?程序例:

#include

?#include

?#include

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;?}

函數(shù)名: perror?功?能:

系統(tǒng)錯(cuò)誤信息?用?法: void perror(char

*string);?程序例:

#include

int main(void)?{?FILE

*fp;

fp = fopen("perror.dat",

"r");?if

(!fp)?perror("Unable to open file for reading");?return

0;?}

函數(shù)名: pieslice?功?能:

繪制并填充一個(gè)扇形?用?法: void far pieslice(int x,

int stanle, int endangle, int radius);?程序例:

#include

?#include

?#include

?#include

int main(void)?{?int gdriver = DETECT, gmode,

errorcode;?int midx,

midy;?int stangle = 45, endangle =

135, radius = 100;

initgraph(&gdriver, &gmode,

"");

errorcode =

graphresult();?if (errorcode !=

grOk)?{?printf("Graphics error: %s\n",

grapherrormsg(errorcode));?printf("Press any key to halt:");?getch();?exit(1); ?}

midx = getmaxx() /

2;?midy = getmaxy() /

2;

setfillstyle(EMPTY_FILL,

getmaxcolor());?pieslice(midx, midy, stangle,

endangle, radius);

getch();?closegraph();?return

0;?}

函數(shù)名: poke?功?能:

存值到一個(gè)給定存儲(chǔ)單元?用?法: void poke(int segment, int

offset, int value);?程序例:

#include

?#include

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;?}

函數(shù)名: pokeb?功?能:

存值到一個(gè)給定存儲(chǔ)單元?用?法: void pokeb(int segment,

int offset, char value);?程序例:

#include

?#include

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;?}

函數(shù)名: poly?功?能:

根據(jù)參數(shù)產(chǎn)生一個(gè)多項(xiàng)式?用?法: double poly(double x, int

n, double c[]);?程序例:

#include

?#include

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;?}

函數(shù)名: pow?功?能:

指數(shù)函數(shù)(x的y次方)?用?法: double pow(double x,

double y);?程序例:

#include

?#include

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;?}

函數(shù)名: pow10?功?能:

指數(shù)函數(shù)(10的p次方)?用?法: double pow10(int

p);?程序例:

#include

?#include

int main(void)?{?double p =

3.0;

printf("Ten raised to %lf

is %lf\n", p, pow10(p));?return

0;?}

函數(shù)名: printf?功?能:

產(chǎn)生格式化輸出的函數(shù)?用?法: int printf(char

*format...);?程序例:

#include

?#include

#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,"");

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