http://cppreference.com/wiki/ 2010-09-09T09:14:57-07:00 http://cppreference.com/wiki/ http://cppreference.com/wiki/lib/images/favicon.ico text/html 2008-10-14T15:42:02-07:00 http://cppreference.com/wiki/c/other/abort?rev=1224024122&do=diff abort Syntax: #include <cstdlib> void abort( void ); The function abort() terminates the current program. Depending on the implementation, the return value can indicate failure. Related Topics: assert, atexit, exit text/html 2010-02-03T05:34:37-07:00 http://cppreference.com/wiki/c/other/assert?rev=1265204077&do=diff assert Syntax: #include <cassert> assert( exp ); The assert() macro is used to test for errors. If exp evaluates to zero, assert () writes information to stderr and exits the program. If the macro NDEBUG is defined, the assert() macros will be ignored. text/html 2008-10-14T15:42:02-07:00 http://cppreference.com/wiki/c/other/atexit?rev=1224024122&do=diff atexit Syntax: #include <cstdlib> int atexit( void (*func)(void) ); The function atexit() causes the function pointed to by func to be called when the program terminates. You can make multiple calls to atexit() (at least 32, depending on your compiler) and those functions will be called in reverse order of their establishment. The return value of atexit() is zero upon success, and non-zero on failure. text/html 2008-10-14T15:42:02-07:00 http://cppreference.com/wiki/c/other/bsearch?rev=1224024122&do=diff bsearch Syntax: #include <cstdlib> void *bsearch( const void *key, const void *buf, size_t num, size_t size, int (*compare)(const void *, const void *) ); The bsearch() function searches buf[0] to buf[num-1] for an item that matches key, using a binary search. The function compare should return negative if its first argument is less than its second, zero if equal, and positive if greater. The items in the array buf should be in ascending order. The return value of bsearch() is a po… text/html 2008-10-14T15:42:02-07:00 http://cppreference.com/wiki/c/other/exit?rev=1224024122&do=diff exit Syntax: #include <cstdlib> void exit( int exit_code ); The exit() function stops the program. exit_code is passed on to be the return value of the program, where usually zero indicates success and non-zero indicates an error. Related Topics: abort, atexit, system text/html 2009-04-12T05:58:27-07:00 http://cppreference.com/wiki/c/other/getenv?rev=1239541107&do=diff getenv Syntax: #include <cstdlib> char *getenv( const char *name ); The function getenv() returns environmental information associated with name, and is very implementation dependent. NULL is returned if no information about name is available. text/html 2008-10-14T15:42:02-07:00 http://cppreference.com/wiki/c/other/longjmp?rev=1224024122&do=diff longjmp Syntax: #include <csetjmp> void longjmp( jmp_buf envbuf, int status ); The function longjmp() causes the program to start executing code at the point of the last call to setjmp(). envbuf is usually set through a call to setjmp(). status becomes the return value of setjmp() and can be used to figure out where longjmp() came from. status should not be set to zero. text/html 2009-04-12T05:58:03-07:00 http://cppreference.com/wiki/c/other/putenv?rev=1239541083&do=diff putenv Syntax: #include <cstdlib> int putenv( const char *envstring ); The function putenv() creates, modifies or removes enviroment variables. On success return is 0; on failure it is -1. Related Topics: system,getenv text/html 2010-03-03T05:30:46-07:00 http://cppreference.com/wiki/c/other/qsort?rev=1267623046&do=diff qsort Syntax: #include <cstdlib> void qsort( void *buf, size_t num, size_t size, int (*compare)(const void*, const void *) ); The qsort function sorts buf (which contains num items, each of size size) using Quicksort. The compare function is used to compare the items in buf, and should return negative if the first argument is less than the second, zero if they are equal, and positive if the first argument is greater than the second. qsort() sorts buf in ascending order. text/html 2008-11-29T14:09:33-07:00 http://cppreference.com/wiki/c/other/raise?rev=1227996573&do=diff raise Syntax: #include <csignal> int raise( int signal ); The raise() function sends the specified signal to the program. Some signals: SignalMeaningSIGABRT Termination errorSIGFPE Floating pointer errorSIGILL Bad instructionSIGINT User pressed CTRL-CSIGSEGV Illegal memory accessSIGTERM Terminate program The return value is zero upon success, nonzero on failure. text/html 2010-08-28T18:38:58-07:00 http://cppreference.com/wiki/c/other/rand?rev=1283045938&do=diff rand Syntax: #include <cstdlib> int rand( void ); The function rand() returns a pseudorandom integer between zero and RAND_MAX. An example: srand( time(NULL) ); for( i = 0; i < 10; i++ ) printf( "Random number #%d: %d\n", i, rand() ); text/html 2008-10-14T15:42:02-07:00 http://cppreference.com/wiki/c/other/setjmp?rev=1224024122&do=diff setjmp Syntax: #include <csetjmp> int setjmp( jmp_buf envbuf ); The setjmp() function saves the system stack in envbuf for use by a later call to longjmp(). When you first call setjmp(), its return value is zero. Later, when you call longjmp(), the second argument of longjmp() is what the return value of setjmp() will be. Confused? Read about longjmp(). text/html 2010-03-24T08:31:42-07:00 http://cppreference.com/wiki/c/other/signal?rev=1269444702&do=diff signal Syntax: #include <csignal> void ( *signal( int signal, void (* func) (int)) ) (int); The signal() function sets func to be called when signal is received by your program. func can be a custom signal handler, or one of these macros (defined in the csignal header file): text/html 2009-09-13T11:48:31-07:00 http://cppreference.com/wiki/c/other/srand?rev=1252867711&do=diff srand Syntax: #include <cstdlib> void srand( unsigned seed ); The function srand() is used to seed the random sequence generated by rand(). For any given seed, rand() will generate a specific “random” sequence over and over again. srand( time(NULL) ); for( i = 0; i < 10; i++ ) printf( "Random number #%d: %d\n", i, rand() ); text/html 2009-04-20T04:54:34-07:00 http://cppreference.com/wiki/c/other/start?rev=1240228474&do=diff abortstops the programassertstops the program if an expression isn't trueatexitsets a function to be called when the program exitsbsearchperform a binary searchexitstop the programgetenvget environnment information about a variablelongjmpstart execution at a certain point in the programputenvadd/modify the environmental settingsqsortperform a quicksortraisesend a signal to the programrandreturns a pseudorandom numbersetjmpset execution to start at a certain pointsignalregister a function as a si… text/html 2008-10-14T15:42:02-07:00 http://cppreference.com/wiki/c/other/system?rev=1224024122&do=diff system Syntax: #include <cstdlib> int system( const char *command ); The system() function runs the given command by passing it to the default command interpreter. The return value is usually zero if the command executed without errors. If command is NULL, system() will test to see if there is a command interpreter available. Non-zero will be returned if there is a command interpreter available, zero if not. text/html 2009-05-25T22:23:40-07:00 http://cppreference.com/wiki/c/other/va_arg?rev=1243315420&do=diff va_arg Syntax: #include <cstdarg> type va_arg( va_list argptr, type ); void va_end( va_list argptr ); void va_start( va_list argptr, last_parm ); The va_arg() macros are used to pass a variable number of arguments to a function.