Input and Output: <stdio.h>
FILE *fopen(const char *filename, const char *mode)
FILE *freopen(const char *filename, const char *mode, FILE *stream)
int fflush(FILE *stream)
int fclose(FILE *stream)
int remove(const char *filename)
int rename(const char *oldname, const char *newname)
FILE *tmpfile(void)
char *tmpnam(char s[L_tmpnam])
int setvbuf(FILE *stream, char *buf, int mode, size_t size)
void setbuf(FILE *stream, char *buf)
int fprint(FILE *stream, const char *format, ...)
int sprintf(char *s, const char *format, ...)
vprintf(const char *format, va_list arg)
vfprintf(FILE *stream, const char *format, va_list arg)
vsprintf(char *s, const char *format, va_list arg)
int fscanf(FILE *stream, const char *format, ...)
int scanf(const char *format, ...)
int sscanf(char *s, const char *format, ...)
int fgetc(FILE *stream)
char *fgets(char *s, int n, FILE *stream)
int fputc(int c, FILE *stream)
int fputs(const char *s, FILE *stream)
int getc(FILE *stream)
int getchar(void)
char *gets(char *s)
int putc(int c, FILE *stream)
int putchar(int c)
int ungetc(int c, FILE *stream)
size_t fread(void *ptr, size_t size, size_t nobj, FILE *stream)
size_t fwrite(const void *ptr, size_t size, size_t nobj, FILE *stream)
int fseek(FILE *stream, long offset, int orogin)
long ftell(FILE *stream)
void rewind(FILE *stream)
int fgetpos(FILE *stream, fpos_t *ptr)
int fsetpos(FILE *stream, const fpos_t *ptr)
void clearerr(FILE *stream)
int feof(FILE *stream)
int ferror(FILE *stream)
void perror(const char *s)
Character Class Tests: <ctype.h>
isalnum(c)
isalpha(c)
iscntrl(c)
isdigit(c)
isgraph(c)
islower(c)
isprint(c)
ispunct(c)
isspace(c)
isupper(c)
isxdigit(c)
String Functions: <string.h>
char *strcpy(s , ct)
char *strncpy(s , ct , n)
char *strcat(s , ct)
char *strncat(s , ct , n)
int strcmp(cs , ct)
int strncmp(cs , ct ,n)
char *strchr(cs , c)
char *strrchr(cs , c)
size_t strspn(cs , ct)
size_t strcspn(cs , ct)
char *strstr(cs , ct)
size_t strlen(cs)
char *strerror(n)
char *strtok(s , ct)
Mathematical Functions: <math.h>
sin(x)
cos(x)
tan(x)
asin(x)
acos(x)
atan(x)
atan2(x)
sinh(x)
cosh(x)
tanh(x)
exp(x)
log(x)
log10(x)
pow(x,y)
sqrt(x)
ceil(x)
floor(x)
fabs(x)
ldexp(x)
frexp(x,double *ip)
modf(x,double *ip)
fmod(x,y)
Utility Functions: <stdlib.h>
double atof(const char *s)
int atoi(const char *s
long atol(const char *s)
double strrod(const char *s, char **endp)
long strtol(const char *s, char **endp, int base)
unsigned long strtoul(const char *s, char **endp, int base)
int rand(void)
void srand(unsigned int seed)
void *calloc(size_t nobj, size_t size)
void *malloc(size_t size)
void *realloc(void *p, size_t size)
void free(void *p)
void abort(void)
void exit(int status)
int atexit(void (*fcn)(void))
int system(const char *s)
char *getenv(const char *name)
void *bsearch(const void *key, const void *base, size_t n, size_t size, int (*cmp)(const void *keyval, const void *datum))
void qsort(void *base, size_t n, size_t size, int (*cmp)(const void *, const void *))
int abs(int n)
long labs(long n)
div_t div(int num, int denom)
ldiv_t ldiv(long num , long denom)
Diagnostics: <assert.h>
void assert(int expression)
Non-local Jumps: <setjmp.h>
int setjmp(jmp_buf env)
void longjmp(jmp_buf env, int val)
Signals: <signal.h>
void (*signal(int sig, void (*handler)(int)))(int)
Data and Time Functions: <time.h>
clock_t clock(void)
time_t time(time_t , *tp
double difftime(time_t time2 , time_t time1)
time_t mktime(struct tm *tp)
char *asctime(const time_t *tp)
char *ctime(const time_t *tp)
struct tm *gmtime(const time_t *tp)
struct tm *localtime(const time_t *tp)
size_t strftime(char *s, size_t smax, const char *fmt, const struct tm *tp)
