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L.xml
函数名:?labs?
功??能:?取长整型绝对值?
用??法:?long?labs(long?n);?
程序例:?
#include?<math.h>? int?main(void)? {? ???long?result;? ???long?x?=?-12345678L;? ???result=?labs(x);? ???printf("number:?%ld?abs?value:?%ld\n",? ??????x,?result);? ???return?0;? }? ?? ?? ??
#include?<stdio.h>?
函数名:?ldexp?
功??能:?计算value*2的幂?
用??法:?double?ldexp(double?value,?int?exp);?
程序例:?
#include?<stdio.h>? #include?<math.h>? int?main(void)? {? ???double?value;? ???double?x?=?2;? ???/*?ldexp?raises?2?by?a?power?of?3? ??????then?multiplies?the?result?by?2???*/? ???value?=?ldexp(x,3);? ???printf("The?ldexp?value?is:?%lf\n",? ??????value);? ???return?0;? }? ?? ??函数名:?ldiv?
功??能:?两个长整型数相除,?返回商和余数?
用??法:?ldiv_t?ldiv(long?lnumer,?long?ldenom);?
程序例:?
#include?<stdlib.h>? #include?<stdio.h>? int?main(void)? {? ???ldiv_t?lx;? ???lx?=?ldiv(100000L,?30000L);? ???printf("100000?div?30000?=?%ld?remainder?%ld\n",?lx.quot,?lx.rem);? ???return?0;? }? ?? ?? ??函数名:?lfind?
功??能:?执行线性搜索?
用??法:?void?*lfind(void?*key,?void?*base,?int?*nelem,?int?width,?
int?(*fcmp)());?程序例:?
#include?<stdio.h>? #include?<stdlib.h>? int?compare(int?*x,?int?*y)? {? ???return(?*x?-?*y?);? }? int?main(void)? {? ???int?array[5]?=?{35,?87,?46,?99,?12};? ???size_t?nelem?=?5;? ???int?key;? ???int?*result;? ???key?=?99;? ???result?=?lfind(&key,?array,?&nelem,? ????????sizeof(int),?(int(*)(const?void?*,const?void?*))compare);? ???if?(result)? ??????printf("Number?%d?found\n",key);? ???else? ??????printf("Number?%d?not?found\n",key);? ???return?0;? }? ?? ??函数名:?line?
功??能:?在指定两点间画一直线?
用??法:?void?far?line(int?x0,?int?y0,?int?x1,?int?y1);?
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?xmax,?ymax;? ???/*?initialize?graphics?and?local?variables?*/? ???initgraph(&gdriver,?&gmode,?"");? ???/*?read?result?of?initialization?*/? ???errorcode?=?graphresult();? ???/*?an?error?occurred?*/? ???if?(errorcode?!=?grOk)? ???{? ??????printf("Graphics?error:?%s\n",? ?????????????grapherrormsg(errorcode));? ??????printf("Press?any?key?to?halt:");? ??????getch();? ??????exit(1);? ???}? ???setcolor(getmaxcolor());? ???xmax?=?getmaxx();? ???ymax?=?getmaxy();? ???/*?draw?a?diagonal?line?*/? ???line(0,?0,?xmax,?ymax);? ???/*?clean?up?*/? ???getch();? ???closegraph();? ???return?0;? }? ?? ??函数名:?linerel?
功??能:?从当前位置点(CP)到与CP有一给定相对距离的点画一直线?
用??法:?void?far?linerel(int?dx,?int?dy);?
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;? ???char?msg[80];? ???/*?initialize?graphics?and?local?variables?*/? ???initgraph(&gdriver,?&gmode,?"");? ???/*?read?result?of?initialization?*/? ???errorcode?=?graphresult();? ???if?(errorcode?!=?grOk)? ???{? ??????printf("Graphics?error:?%s\n",? ??grapherrormsg(errorcode));? ??????printf("Press?any?key?to?halt:");? ??????getch();? ??????exit(1);? ???}? ???/*?move?the?C.P.?to?location?(20,?30)?*/? ???moveto(20,?30);? ???/*?create?and?output?a? ??????message?at?(20,?30)?*/? ???sprintf(msg,?"?(%d,?%d)",?getx(),?gety());? ???outtextxy(20,?30,?msg);? ???/*?draw?a?line?to?a?point?a?relative? ??????distance?away?from?the?current? ??????value?of?C.P.???*/? ???linerel(100,?100);? ???/*?create?and?output?a?message?at?C.P.?*/? ???sprintf(msg,?"?(%d,?%d)",?getx(),?gety());? ???outtext(msg);? ???/*?clean?up?*/? ???getch();? ???closegraph();? ???return?0;? }? ??函数名:?localtime?
功??能:?把日期和时间转变为结构?
用??法:?struct?tm?*localtime(long?*clock);?
程序例:?
#include?<time.h>? #include?<stdio.h>? #include?<dos.h>? int?main(void)? {? ???time_t?timer;? ???struct?tm?*tblock;? ???/*?gets?time?of?day?*/? ???timer?=?time(NULL);? ???/*?converts?date/time?to?a?structure?*/? ???tblock?=?localtime(&timer);? ???printf("Local?time?is:?%s",?asctime(tblock));? ???return?0;? }? ?? ?? ??函数名:?lock?
功??能:?设置文件共享锁?
用??法:?int?lock(int?handle,?long?offset,?long?length);?
程序例:?
#include?<io.h>? #include?<fcntl.h>? #include?<sys\stat.h>? #include?<process.h>? #include?<share.h>? #include?<stdio.h>? int?main(void)? {? ???int?handle,?status;? ???long?length;? ???/*?Must?have?DOS?Share.exe?loaded?for?*/? ???/*?file?locking?to?function?properly?*/? ???handle?=?sopen("c:\\autoexec.bat",? ??????O_RDONLY,SH_DENYNO,S_IREAD);? ???if?(handle?<?0)? ???{? ??????printf("sopen?failed\n");? ??????exit(1);? ???}? ???length?=?filelength(handle);? ???status?=?lock(handle,0L,length/2);? ???if?(status?==?0)? ??????printf("lock?succeeded\n");? ???else? ??????printf("lock?failed\n");? ???status?=?unlock(handle,0L,length/2);? ???if?(status?==?0)? ??????printf("unlock?succeeded\n");? ???else? ??????printf("unlock?failed\n");? ???close(handle);? ???return?0;? }? ?? ??函数名:?log?
功??能:?对数函数ln(x)?
用??法:?double?log(double?x);?
程序例:?
#include?<math.h>? #include?<stdio.h>? int?main(void)? {? ???double?result;? ???double?x?=?8.6872;? ???result?=?log(x);? ???printf("The?natural?log?of?%lf?is?%lf\n",?x,?result);? ???return?0;? }? ?? ??函数名:?log10?
功??能:?对数函数log?
用??法:?double?log10(double?x);?
程序例:?
#include?<math.h>? #include?<stdio.h>? int?main(void)? {? ???double?result;? ???double?x?=?800.6872;? ???result?=?log10(x);? ???printf("The?common?log?of?%lf?is?%lf\n",?x,?result);? ???return?0;? }? ?? ?? ??函数名:?longjump?
功??能:?执行非局部转移?
用??法:?void?longjump(jmp_buf?env,?int?val);?
程序例:?
#include?<stdio.h>? #include?<setjmp.h>? #include?<stdlib.h>? void?subroutine(jmp_buf);? int?main(void)? {? ???int?value;? ???jmp_buf?jumper;? ???value?=?setjmp(jumper);? ???if?(value?!=?0)? ???{? ??????printf("Longjmp?with?value?%d\n",?value);? ??????exit(value);? ???}? ???printf("About?to?call?subroutine?...?\n");? ???subroutine(jumper);? ???return?0;? }? void?subroutine(jmp_buf?jumper)? {? ???longjmp(jumper,1);? }? ?? ?? ??函数名:?lowvideo?
功??能:?选择低亮度字符?
用??法:?void?lowvideo(void);?
程序例:?
#include?<conio.h>? int?main(void)? {? ???clrscr();? ???highvideo();? ???cprintf("High?Intesity?Text\r\n");? ???lowvideo();? ???gotoxy(1,2);? ???cprintf("Low?Intensity?Text\r\n");? ???return?0;? }? ?? ?? ??函数名:?lrotl,?_lrotl?
功??能:?将无符号长整型数向左循环移位?
用??法:?unsigned?long?lrotl(unsigned?long?lvalue,?int?count);?
unsigned?long?_lrotl(unsigned?long?lvalue,?int?count);?程序例:?
#include?<stdlib.h>? #include?<stdio.h>? int?main(void)? {? ???unsigned?long?result;? ???unsigned?long?value?=?100;? ???result?=?_lrotl(value,1);? ???printf("The?value?%lu?rotated?left?one?bit?is:?%lu\n",?value,?result);? ???return?0;? }? ?? ??函数名:?lsearch?
功??能:?线性搜索?
用??法:?void?*lsearch(const?void?*key,?void?*base,?size_t?*nelem,?
int?(*fcmp)(const?void?*,?const?void?*));?程序例:?
#include?<stdio.h>? #include?<stdlib.h>? int?compare(int?*x,?int?*y)? {? ???return(?*x?-?*y?);? }? int?main(void)? {? ???int?array[5]?=?{35,?87,?46,?99,?12};? ???size_t?nelem?=?5;? ???int?key;? ???int?*result;? ???key?=?99;? ???result?=?lfind(&key,?array,?&nelem,? ???????????????sizeof(int),?(int(*)(const?void?*,const?void?*))compare);? ???if?(result)? ??????printf("Number?%d?found\n",key);? ???else? ??????printf("Number?%d?not?found\n",key);? ???return?0;? }? ?? ?? ??函数名:?lseek?
功??能:?移动文件读/写指针?
用??法:?long?lseek(int?handle,?long?offset,?int?fromwhere);?
程序例:?
#include?<sys\stat.h>? #include?<string.h>? #include?<stdio.h>? #include?<fcntl.h>? #include?<io.h>? int?main(void)? {? ???int?handle;? ???char?msg[]?=?"This?is?a?test";? ???char?ch;? ???/*?create?a?file?*/? ???handle?=?open("TEST.$$$",?O_CREAT?|?O_RDWR,?S_IREAD?|?S_IWRITE);? ???/*?write?some?data?to?the?file?*/? ???write(handle,?msg,?strlen(msg));? ???/*?seek?to?the?begining?of?the?file?*/? ???lseek(handle,?0L,?SEEK_SET);? ???/*?reads?chars?from?the?file?until?we?hit?EOF?*/? ???do? ???{? ??????read(handle,?&ch,?1);? ??????printf("%c",?ch);? ???}??while?(!eof(handle));? ???close(handle);? ???return?0;? }? ?? ?? ?? ?? ?本文使用?书画小说软件?发布,内容与软件无关,书画小说软件?更惬意的读、更舒心的写、更轻松的发布。
L.xml