basic programming

hello world

basic

Stdio

• printf explain in detail

int printf ( const char * format, ... );

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file related operations

• fopen FILE * fopen(const char * path,const char * mode);
• fclose int fclose( FILE *fp );
• fread size_t fread(void * ptr,size_t size,size_t nmemb,FILE * stream);
• fwrite size_t fwrite(const void * ptr,size_t size,size_t nmemb,FILE * stream);
• fseek int fseek(FILE * stream,long offset,int whence);
• feof int feof(FILE * stream);

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String

char *strdup(const char *s); 
char *strcpy(char* dest, const char *src);
char *strncpy(char *dest, const char *src，intcount);
char* strcat(char * str1,char * str2); 
char *strncat(char *dest, const char *src, size_t maxlen);
int strcmp(char * str1,char * str2); 
int strncmp(char *str1,char *str2,int count);
char *strpbrk(const char *s1, const char *s2);
int strcspn(const char *s1, const char *s2);
int strspn(const char *s1, const char *s2);
char* strchr(char* str,char ch); 
char *strrchr(const char *s, int c);
char* strstr(char* str1,char* str2); 
char *strrev(char *s);
char *strnset(char *s, int ch, size_t n);
char *strset(char *s, int ch);
char *strtok(char *s1, const char *s2);
char *strupr(char *s); 
char *strlwr(char *s); 
char *strerror(int errnum);
void *memcpy(void *dest, const void *src, size_t n);
void *memccpy(void *dest, const void *src, int c, size_t n);
void *memchr(const void *s, int c, size_t n); 
int memcmp(const void *s1, const void *s2,size_t n);
int memicmp(const void *s1, const void *s2, size_t n); 
void *memmove(void *dest, const void *src, size_t n);
void *memset(void *s, int c, size_t n); 

Pointer

Memory

Lib

data structure

algorithm