C语言头文件下包含函数.

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 *n

ame; 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((unsignedtime(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