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Function Name :? Abort?

?? Yes :? Terminate a process abnormally?

Use ?? Method :? Void? Abort (void );?

Program example :?

#include? ? #include? ? int?main(void)? {? ??//ddd ??printf("Calling?abort()\n");? ??abort();? ??return?0;?/*?This?is?never?reached?*/? }?

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Function Name :? Abs?

?? Yes :? What is the absolute value of an integer?

Use ?? Method :? Int? ABS (Int? I );?

Program example :?

#include? ? #include? ? int?main(void)? {? ??int?number?=?-1234;? ??printf("number:?%d??absolute?value:?%d\n",?number,?abs(number));? ??return?0;? }?

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Function Name :? Absread ,? Abswirte?

?? Yes :? Read and Write Data in absolute disk sectors?

Use ?? Method :? Int? Absread (Int? Drive ,? Int? Nsects ,? Int? Sectno ,? Void? * Buffer );?

?int?abswrite(int?drive,?int?nsects,?in?tsectno,?void?*buffer);?

Program example :?

/*?absread?example?*/? #include? ? #include? ? #include? ? #include? ? int?main(void)? {? ??int?i,?strt,?ch_out,?sector;? ??char?buf[512];? ??printf("Insert?a?diskette?into?drive?A?and?press?any?key\n");? ??getch();? ??sector?=?0;? ??if?(absread(0,?1,?sector,?&buf)?!=?0)? ??{? ?????perror("Disk?problem");? ????? ?????exit(1);? ??}? ??printf("Read?OK\n");? ??strt?=?3;? ??for?(i=0;?i<80;?i++)? ??{? ?????ch_out?=?buf[strt+i];? ?????putchar(ch_out);? ??}? ??printf("\n");? ??return(0);? }?

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Function Name :? Access?

?? Yes :? Are you sure you want to access the file?

Use ?? Method :? Int? Access (const? Char? * Filename ,? Int? Amode );?

Program example :?

#include? ? #include? ? int?file_exists(char?*filename);? int?main(void)? {? ??printf("Does?NOTEXIST.FIL?exist:?%s\n",? ??file_exists("NOTEXISTS.FIL")???"YES"?:?"NO");? ??return?0;? }? int?file_exists(char?*filename)? {? ??return?(access(filename,?0)?==?0);? }?

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Function Name :? ACOs?

?? Yes :? Arccosine function?

Use ?? Method :? Double? ACOs (double? X );?

Program example :?

#include? ? #include? ? int?main(void)? {? ??double?result;? ??double?x?=?0.5;? ??result?=?acos(x);? ??printf("The?arc?cosine?of?%lf?is?%lf\n",?x,?result);? ??return?0;? }?

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Function Name :? Allocmem?

?? Yes :? Allocate dos storage segments?

Use ?? Method :? Int? Allocmem (unsigned? Size ,? Unsigned? * SEG );?

Program example :?

#include? ? #include?? #include? ? int?main(void)? {? ??unsigned?int?size,?segp;? ??int?stat;? ??size?=?64;?/*?(64?x?16)?=?1024?bytes?*/? ??stat?=?allocmem(size,?&segp);? ??if?(stat?==?-1)? ?????printf("Allocated?memory?at?segment:?%x\n",?segp);? ??else? ?????printf("Failed:?maximum?number?of?paragraphs?available?is?%u\n",? ????????????stat);? ??return?0;? }?

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Function Name :? ARC?

?? Yes :? Draw an arc?

Use ?? Method :? Void? Far? ARC (Int? X ,? Int? Y ,? Int? Stangle ,? Int? Endangle ,? Int? Radius );?

Program example :?

#include? ? #include? ? #include? ? #include? ? int?main(void)? {? ????/*?request?auto?detection?*/? ???int?gdriver?=?DETECT,?gmode,?errorcode;? ???int?midx,?midy;? ???int?stangle?=?45,?endangle?=?135;? ???int?radius?=?100;? ???/*?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);????/*?terminate?with?an?error?code?*/? ???}? ???midx?=?getmaxx()?/?2;? ???midy?=?getmaxy()?/?2;? ???setcolor(getmaxcolor());? ???/*?draw?arc?*/? ???arc(midx,?midy,?stangle,?endangle,?radius);? ???/*?clean?up?*/? ???getch();? ???closegraph();? ???return?0;? }?

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Function Name :? Asctime?

?? Yes :? Is the conversion date and time an ascii code?

Use ?? Method :? Char? * Asctime (const? Struct? TM? * Tblock );?

Program example :?

#include? ? #include? ? #include? ? int?main(void)? {? ???struct?tm?t;? ???char?str[80];? ???/*?sample?loading?of?tm?structure??*/? ???t.tm_sec????=?1;??/*?Seconds?*/? ???t.tm_min????=?30;?/*?Minutes?*/? ???t.tm_hour???=?9;??/*?Hour?*/? ???t.tm_mday???=?22;?/*?Day?of?the?Month??*/? ???t.tm_mon????=?11;?/*?Month?*/? ???t.tm_year???=?56;?/*?Year?-?does?not?include?century?*/? ???t.tm_wday???=?4;??/*?Day?of?the?week??*/? ???t.tm_yday???=?0;??/*?Does?not?show?in?asctime??*/? ???t.tm_isdst??=?0;??/*?Is?Daylight?SavTime;?does?not?show?in?asctime?*/? ???/*?converts?structure?to?null?terminated? ???string?*/? ???strcpy(str,?asctime(&t));? ???printf("%s\n",?str);? ???return?0;? }?

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Function Name :? Asin?

?? Yes :? Arcsin function?

Use ?? Method :? Double? Asin (double? X );?

Program example :?

#include? ? #include? ? int?main(void)? {? ???double?result;? ???double?x?=?0.5;? ???result?=?asin(x);? ???printf("The?arc?sin?of?%lf?is?%lf\n",?x,?result);? ???return(0);? }?

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Function Name :? Assert?

?? Yes :? Test A condition and possibly terminate the program?

Use ?? Method :? Void? Assert (Int? Test );?

Program example :?

#include?? #include? ? #include? ? struct?ITEM?{? ???int?key;? ???int?value;? };? /*?add?item?to?list,?make?sure?list?is?not?null?*/? void?additem(struct?ITEM?*itemptr)?{? ???assert(itemptr?!=?NULL);? ???/*?add?item?to?list?*/? }? int?main(void)? {? ???additem(NULL);? ???return?0;? }?

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Function Name :? Atan?

?? Yes :? Arc tangent function?

Use ?? Method :? Double? Atan (double? X );?

Program example :?

#include? ? #include? ? int?main(void)? {? ???double?result;? ???double?x?=?0.5;? ???result?=?atan(x);? ???printf("The?arc?tangent?of?%lf?is?%lf\n",?x,?result);? ???return(0);? }?

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Function Name :? Atan2?

?? Yes :? Calculate the arc tangent of Y/X?

Use ?? Method :? Double? Atan2 (double? Y ,? Double? X );?

Program example :?

#include? ? #include? ? int?main(void)? {? ???double?result;? ???double?x?=?90.0,?y?=?45.0;? ???result?=?atan2(y,?x);? ???printf("The?arc?tangent?ratio?of?%lf?is?%lf\n",?(y?/?x),?result);? ???return?0;? }?

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Function Name :? Atexit?

?? Yes :? Register the termination function?

Use ?? Method :? Int? Atexit (atexit_t? Func );?

Program example :?

#include? ? #include? ? void?exit_fn1(void)? {? ???printf("Exit?function?#1?called\n");? }? void?exit_fn2(void)? {? ???printf("Exit?function?#2?called\n");? }? int?main(void)? {? ???/*?post?exit?function?#1?*/? ???atexit(exit_fn1);? ???/*?post?exit?function?#2?*/? ???atexit(exit_fn2);? ???return?0;? }?

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Function Name :? Atof?

?? Yes :? Convert a string to a floating point number?

Use ?? Method :? Double? Atof (const? Char? * Nptr );?

Program example :?

#include? ? #include? ? int?main(void)? {? ???float?f;? ???char?*str?=?"12345.67";? ???f?=?atof(str);? ???printf("string?=?%s?float?=?%f\n",?str,?f);? ???return?0;? }?

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Function Name :? Atoi?

?? Yes :? Convert a string to a growth integer?

Use ?? Method :? Int? Atoi (const? Char? * Nptr );?

Program example :?

#include? ? #include? ? int?main(void)? {? ???int?n;? ???char?*str?=?"12345.67";? ???n?=?atoi(str);? ???printf("string?=?%s?integer?=?%d\n",?str,?n);? ???return?0;? }?

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Function Name :? Atol?

?? Yes :? Convert a string to a growth integer?

Use ?? Method :? Long? Atol (const? Char? * Nptr );?

Program example :?

#include? ? #include? ? int?main(void)? {? ???long?l;? ???char?*str?=?"98765432";? ???l?=?atol(lstr);? ???printf("string?=?%s?integer?=?%ld\n",?str,?l);? ???return(0);? }? ??

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0017 _ new article. xml