c/c++常用头文件包含函数(转) math.h常用函数 int abs (int x); double acos (double x); double asin (double x); double atan (double x); double atan2 (double y, double x); double atof (const char *s); double ceil (double x); double cos (double x); double cosh (double x); double exp (double x); double fabs (double x); double floor (double x); double fmod (double x, double y); double frexp (double x, int *exponent); long labs (long x); double ldexp (double x, int exponent); double log (double x); double log10 (double x); double modf (double x, double *ipart); double pow (double x, double y); double sin (double x); double sinh (double x); double sqrt (double x); double tan (double x); double tanh (double x); stdio.h常用函数包括 int fclose (FILE *stream); int fflush (FILE *stream); int fgetc (FILE *stream); int fgetpos (FILE *stream, fpos_t *pos); char * fgets (char *s, int n, FILE *stream); FILE * fopen (const char *path, const char *mode); int fprintf (FILE *stream, const char *format, …); int fputc (int c, FILE *stream); int fputs (const char *s, FILE *stream); size_t fread (void *ptr, size_t size, size_t n, FILE *stream); FILE * freopen (const char *path, const char *mode, FILE *stream); int fscanf (FILE *stream, const char *format, …); int fseek (FILE *stream, long offset, int whence); int fsetpos (FILE *stream, const fpos_t *pos); long ftell (FILE *stream); size_t fwrite (const void *ptr, size_t size, size_t n, FILE *stream); int printf (const char *format, …); int puts (const char *s); int rename (const char *oldname, const char *newname); void rewind (FILE *stream); int scanf (const char *format, …); stdlib.h常用函数包括 stdlib 头文件里包含了C、C++语言的一些函数 该文件包含了的C语言标准库函数的定义 stdlib.h里面定义了五种类型、一些宏和通用工具函数。 类型例如size_t、wchar_t、div_t、ldiv_t和lldiv_t; 宏例如EXIT_FAILURE、EXIT_SUCCESS、RAND_MAX和MB_CUR_MAX等等; 常用的函数如malloc()、calloc()、realloc()、free()、system()、atoi()、atol()、rand()、 srand()、exit()等等。 具体的内容你自己可以打开编译器的include目录里面的stdlib.h头文件看看 int abs (int x); int atexit (atexit_t func); double atof (const char *s); int atoi (const char *s); long atol (const char *s); void * bsearch(const void *key, const void *base, size_t nelem, size_t width, int (*fcmp)()); void * calloc (size_t nitems, size_t size); div_t div (int numer, int denom); void exit (int status); void free (void *block); char * getenv (const char *name); long labs (long x); ldiv_t ldiv (long numer, long denom); void * malloc (size_t size); void qsort (void *base, size_t nelem, size_t width, int (*fcmp)()); int rand (void); void * realloc(void *block, size_t size); void srand (unsigned seed); double strtod (const char *s, char endptr); long strtol (const char *s, char endptr, int radix); unsigned long strtoul (const char *s, char endptr, int radix); int system (const char *command); max(a,b) (((a) > (b)) ? (a) : (b)) min(a,b) (((a) < (b)) ? (a) : (b)) random(num) (rand() % (num)) randomize() srand((unsigned)time(NULL)) string.h常用函数包括: char * stpcpy (char *dest, const char *src); char * strcat (char *dest, const char *src); char * strchr (const char *s, int c); int strcmp (const char *s1, const char *s2); char * strcpy (char *dest, const char *src); size_t strcspn (const char *s1, const char *s2); char * strdup (const char *s); char * strerror(int errnum); conio.h不是C标准库中的头文件。 conio是Console Input/Output(控制台输入输出)的简写,其中定义了通过控制台进行数据输入和数据输出的函数,主要是一些用户通过按键盘产生的对应操作,比如getch()函数等等。 包含的函数 cgets(char *); cprintf(const char *, …); cputs(const char *); cscanf(const char *, …); inp(unsigned short); inpw(unsigned short); getch(void); getche(void); kbhit(void); outp(unsigned short, int); outpw(unsigned short, unsigned short); putch(int); ungetch(int); void _Cdecl clreol (void); void _Cdecl clrscr (void); void _Cdecl delline (void); int _Cdecl gettext (int left, int top, int right, int bottom, void *destin); void _Cdecl gettextinfo (struct text_info *r); void _Cdecl gotoxy (int x, int y); void _Cdecl highvideo (void); void _Cdecl insline (void); void _Cdecl lowvideo (void); int _Cdecl movetext (int left, int top, int right, int bottom, int destleft, int desttop); void _Cdecl normvideo (void); int _Cdecl puttext (int left, int top, int right, int bottom, void *source); void _Cdecl textattr (int newattr); void _Cdecl textbackground (int newcolor); void _Cdecl textcolor (int newcolor); void _Cdecl textmode (int newmode); int _Cdecl wherex (void); int _Cdecl wherey (void); void _Cdecl window (int left, int top, int right, int bottom); har *_Cdecl cgets (char *str); int _Cdecl cprintf (const char *format, …); int _Cdecl cputs (const char *str); int _Cdecl cscanf (const char *format, …); int _Cdecl getch (void); int _Cdecl getche (void); char *_Cdecl getpass (const char *prompt); int _Cdecl kbhit (void); int _Cdecl putch (int c); int _Cdecl ungetch (int ch);
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