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<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312"> <META NAME="Author" CONTENT="wdg"> <META NAME="GENERATOR" CONTENT="Mozilla/4.03 [en] (Win95; I) [Netscape]"> <TITLE>fp</TITLE></HEAD><BODY> <P>函数名: parsfnm<BR>功 能: 分析文件名<BR>用 法: char *parsfnm (char *cmdline, struct fcb *fcbptr, intoption);<BR>程序例:<P>#include <process.h><BR>#include <string.h><BR>#include <stdio.h><BR>#include <dos.h><P>int main(void)<BR>{<BR> char line[80];<BR> struct fcb blk;<P> /* get file name */<BR> printf("Enter drive and file name (no path - ie. a:file.dat)\n");<BR> gets(line);<P> /* put file name in fcb */<BR> if (parsfnm(line, &blk, 1) == NULL)<BR> printf("Error in parsfm call\n");<BR> else<BR> printf("Drive #%d Name: %11s\n",blk.fcb_drive, blk.fcb_name);<P> return 0;<BR>}<BR> <BR> <P>函数名: peek<BR>功 能: 检查存储单元<BR>用 法: int peek(int segment, unsigned offset);<BR>程序例:<P>#include <stdio.h><BR>#include <conio.h><BR>#include <dos.h><P>int main(void)<BR>{<BR> int value = 0;<P> printf("The current status of your keyboard is:\n");<BR> value = peek(0x0040, 0x0017);<BR> if (value & 1)<BR> printf("Right shift on\n");<BR> else<BR> printf("Right shift off\n");<P> if (value & 2)<BR> printf("Left shift on\n");<BR> else<BR> printf("Left shift off\n");<P> if (value & 4)<BR> printf("Control key on\n");<BR> else<BR> printf("Control key off\n");<P> if (value & 8)<BR> printf("Alt key on\n");<BR> else<BR> printf("Alt key off\n");<P> if (value & 16)<BR> printf("Scroll lock on\n");<BR> else<BR> printf("Scroll lock off\n");<P> if (value & 32)<BR> printf("Num lock on\n");<BR> else<BR> printf("Num lock off\n");<P> if (value & 64)<BR> printf("Caps lock on\n");<BR> else<BR> printf("Caps lock off\n");<P> return 0;<BR>}<BR> <BR> <P>函数名: peekb<BR>功 能: 检查存储单元<BR>用 法: char peekb (int segment, unsigned offset);<BR>程序例:<P>#include <stdio.h><BR>#include <conio.h><BR>#include <dos.h><P>int main(void)<BR>{<BR> int value = 0;<P> printf("The current status of your keyboard is:\n");<BR> value = peekb(0x0040, 0x0017);<BR> if (value & 1)<BR> printf("Right shift on\n");<BR> else<BR> printf("Right shift off\n");<P> if (value & 2)<BR> printf("Left shift on\n");<BR> else<BR> printf("Left shift off\n");<P> if (value & 4)<BR> printf("Control key on\n");<BR> else<BR> printf("Control key off\n");<P> if (value & 8)<BR> printf("Alt key on\n");<BR> else<BR> printf("Alt key off\n");<P> if (value & 16)<BR> printf("Scroll lock on\n");<BR> else<BR> printf("Scroll lock off\n");<P> if (value & 32)<BR> printf("Num lock on\n");<BR> else<BR> printf("Num lock off\n");<P> if (value & 64)<BR> printf("Caps lock on\n");<BR> else<BR> printf("Caps lock off\n");<P> return 0;<BR>}<BR> <BR> <P>函数名: perror<BR>功 能: 系统错误信息<BR>用 法: void perror(char *string);<BR>程序例:<P>#include <stdio.h><P>int main(void)<BR>{<BR> FILE *fp;<P> fp = fopen("perror.dat", "r");<BR> if (!fp)<BR> perror("Unable to open file for reading");<BR> return 0;<BR>}<BR> <BR> <P>函数名: pieslice<BR>功 能: 绘制并填充一个扇形<BR>用 法: void far pieslice(int x, int stanle, int endangle, intradius);<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <stdio.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> /* request auto detection */<BR> int gdriver = DETECT, gmode, errorcode;<BR> int midx, midy;<BR> int stangle = 45, endangle = 135, radius = 100;<P> /* initialize graphics and local variables */<BR> initgraph(&gdriver, &gmode, "");<P> /* read result of initialization */<BR> errorcode = graphresult();<BR> if (errorcode != grOk) /* an error occurred */<BR> {<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR> exit(1); /* terminate with an errorcode */<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<P> /* set fill style and draw a pie slice */<BR> setfillstyle(EMPTY_FILL, getmaxcolor());<BR> pieslice(midx, midy, stangle, endangle, radius);<P> /* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <P>函数名: poke<BR>功 能: 存值到一个给定存储单元<BR>用 法: void poke(int segment, int offset, int value);<BR>程序例:<P>#include <dos.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> clrscr();<BR> cprintf("Make sure the scroll lock key is off and pressany key\r\n");<BR> getch();<BR> poke(0x0000,0x0417,16);<BR> cprintf("The scroll lock is now on\r\n");<BR> return 0;<BR>}<BR> <BR> <P>函数名: pokeb<BR>功 能: 存值到一个给定存储单元<BR>用 法: void pokeb(int segment, int offset, char value);<BR>程序例:<P>#include <dos.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> clrscr();<BR> cprintf("Make sure the scroll lock key is off and pressany key\r\n");<BR> getch();<BR> pokeb(0x0000,0x0417,16);<BR> cprintf("The scroll lock is now on\r\n");<BR> return 0;<BR>}<BR> <BR> <P>函数名: poly<BR>功 能: 根据参数产生一个多项式<BR>用 法: double poly(double x, int n, double c[]);<BR>程序例:<P>#include <stdio.h><BR>#include <math.h><P>/* polynomial: x**3 - 2x**2 + 5x - 1 */<P>int main(void)<BR>{<BR> double array[] = { -1.0, 5.0, -2.0, 1.0 };<BR> double result;<P> result = poly(2.0, 3, array);<BR> printf("The polynomial: x**3 - 2.0x**2 + 5x - 1 at 2.0is %lf\n",<BR> result);<BR> return 0;<BR>}<BR> <BR> <P>函数名: pow<BR>功 能: 指数函数(x的y次方)<BR>用 法: double pow(double x, double y);<BR>程序例:<P>#include <math.h><BR>#include <stdio.h><P>int main(void)<BR>{<BR> double x = 2.0, y = 3.0;<P> printf("%lf raised to %lf is %lf\n", x, y, pow(x, y));<BR> return 0;<BR>}<BR> <P>函数名: pow10<BR>功 能: 指数函数(10的p次方)<BR>用 法: double pow10(int p);<BR>程序例:<P>#include <math.h><BR>#include <stdio.h><P>int main(void)<BR>{<BR> double p = 3.0;<P> printf("Ten raised to %lf is %lf\n", p, pow10(p));<BR> return 0;<BR>}<BR> <BR> <P>函数名: printf<BR>功 能: 产生格式化输出的函数<BR>用 法: int printf(char *format...);<BR>程序例:<P>#include <stdio.h><BR>#include <string.h><P>#define I 555<BR>#define R 5.5<P>int main(void)<BR>{<BR> int i,j,k,l;<BR> char buf[7];<BR> char *prefix = buf;<BR> char tp[20];<BR> printf("prefix 6d 6o 8x 10.2e "<BR> "10.2f\n");<BR> strcpy(prefix,"%");<BR> for (i = 0; i < 2; i++)<BR> {<BR> for (j = 0; j < 2; j++)<BR> for (k = 0; k <2; k++)<BR> for (l = 0; l < 2; l++)<BR> {<BR> if (i==0) strcat(prefix,"-");<BR> if (j==0) strcat(prefix,"+");<BR> if (k==0) strcat(prefix,"#");<BR> if (l==0) strcat(prefix,"0");<BR> printf("%5s |",prefix);<BR> strcpy(tp,prefix);<BR> strcat(tp,"6d |");<BR> printf(tp,I);<BR> strcpy(tp,"");<BR> strcpy(tp,prefix);<BR> strcat(tp,"6o |");<BR> printf(tp,I);<BR> strcpy(tp,"");<BR> strcpy(tp,prefix);<BR> strcat(tp,"8x |");<BR> printf(tp,I);<BR> strcpy(tp,"");<BR> strcpy(tp,prefix);<BR> strcat(tp,"10.2e |");<BR> printf(tp,R);<BR> strcpy(tp,prefix);<BR> strcat(tp,"10.2f |");<BR> printf(tp,R);<BR> printf(" \n");<BR> strcpy(prefix,"%");<BR> }<BR> }<BR> return 0;<BR>}<BR> ⌨️ 快捷键说明
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