Pre {border-style: solid; border-width: 1px; border-color: #000; line-Height: 1; color: # 0366ab; font-size: 16px ;}. sysfunc {color: #005080; font-style: italic; font-weight: bold ;}. selffuc {color: # 4bbc8b ;}. bool {color: #0c0a08 ;}. condition {color: #771334; font-weight: bold ;}. key {color: # d10bab ;}. vaR {color: #008023; font-style: italic ;}. digit {color: #5a0080; font-weight: bold ;}. includepre {color: # 0366ab ;}. operator_d {color: #008000; font-weight: bold ;}. operator_x {color: #440080; font-weight: bold ;}
Function Name :? Ultoa?
?? Yes :? Convert an unsigned long integer to a string?
Use ?? Method :? Char? * Ultoa (unsigned? Long? Value ,? Char? * String ,? Int? Radix );?
Program example :?
#include?<stdlib.h>?#include?<stdio.h>?int?main(?void?)?{????unsigned?long?lnumber?=?3123456789L;????char?string[25];????ultoa(lnumber,string,10);????printf("string?=?%s??unsigned?long?=?%lu\n",string,lnumber);????return?0;?}???????
Function Name :? Ungetc?
?? Yes :? Return a character to the input stream?
Use ?? Method :? Int? Ungetc (Char? C ,? File? * Stream );?
Program example :?
#include?<stdio.h>?#include?<ctype.h>?int?main(?void?)?{????int?i=0;????char?ch;????puts("Input?an?integer?followed?by?a?char:");????/*?read?chars?until?non?digit?or?EOF?*/????while((ch?=?getchar())?!=?EOF?&&?isdigit(ch))???????i?=?10?*?i?+?ch?-?48;?/*?convert?ASCII?into?int?value?*/????/*?if?non?digit?char?was?read,?push?it?back?into?input?buffer?*/????if?(ch?!=?EOF)???????ungetc(ch,?stdin);????printf("i?=?%d,?next?char?in?buffer?=?%c\n",?i,?getchar());????return?0;?}???????
Function Name :? Ungetch?
?? Yes :? Return a character to the keyboard buffer?
Use ?? Method :? Int? Ungetch (Int? C );?
Program example :?
#include?<stdio.h>?#include?<ctype.h>?#include?<conio.h>?int?main(?void?)?{????int?i=0;????char?ch;????puts("Input?an?integer?followed?by?a?char:");????/*?read?chars?until?non?digit?or?EOF?*/????while((ch?=?getche())?!=?EOF?&&?isdigit(ch))???????i?=?10?*?i?+?ch?-?48;?/*?convert?ASCII?into?int?value?*/????/*?if?non?digit?char?was?read,?push?it?back?into?input?buffer?*/????if?(ch?!=?EOF)???????ungetch(ch);????printf("\n\ni?=?%d,?next?char?in?buffer?=?%c\n",?i,?getch());????return?0;?}???????
Function Name :? Unixtodos?
?? Yes :? Convert date and time to DOS format?
Use ?? Method :? Void? Unixtodos (long? Utime ,? Struct? Date? * Dateptr ,?
???struct?time?*timeptr);?
Program example :?
#include?<stdio.h>?#include?<dos.h>?char?*month[]?=?{"---",?"Jan",?"Feb",?"Mar",?"Apr",?"May",?"Jun",??????????????????"Jul",?"Aug",?"Sep",?"Oct",?"Nov",?"Dec"};?#define?SECONDS_PER_DAY?86400L??/*?the?number?of?seconds?in?one?day?*/?struct?date?dt;?struct?time?tm;?int?main(void)?{????unsigned?long?val;?/*?get?today‘s?date?and?time?*/????getdate(&dt);????gettime(&tm);????printf("today?is?%d?%s?%d\n",?dt.da_day,?month[dt.da_mon],?dt.da_year);?/*?convert?date?and?time?to?unix?format?(number?of?seconds?since?Jan?1,?1970?*/????val?=?dostounix(&dt,?&tm);?/*?subtract?42?days?worth?of?seconds?*/????val?-=?(SECONDS_PER_DAY?*?42);?/*?convert?back?to?dos?time?and?date?*/????unixtodos(val,?&dt,?&tm);????printf("42?days?ago?it?was?%d?%s?%d\n",?????????dt.da_day,?month[dt.da_mon],?dt.da_year);????return?0;?}???????
Function Name :? Unlink?
?? Yes :? Delete a file?
Use ?? Method :? Int? Unlink (Char? * Filename );?
Program example :?
#include?<stdio.h>?#include?<io.h>?int?main(void)?{????FILE?*fp?=?fopen("junk.jnk","w");????int?status;????fprintf(fp,"junk");????status?=?access("junk.jnk",0);????if?(status?==?0)???????printf("File?exists\n");????else???????printf("File?doesn‘t?exist\n");????fclose(fp);????unlink("junk.jnk");????status?=?access("junk.jnk",0);????if?(status?==?0)???????printf("File?exists\n");????else???????printf("File?doesn‘t?exist\n");??????return?0;?}???????
Function Name :? Unlock?
?? Yes :? Remove the File Share lock?
Use ?? Method :? Int? Unlock (Int? Handle ,? Long? Offset ,? Long? Length );?
Program example :?
#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;????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;?}??????????
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