<< c_lib

string.h

Functions in <string.h>. Following the convention in K&R, the variables s, t are of type char *. cs, ct are of type const char*, n is of type size_t, and c is an int converted to char.

# String Copy and Concatenation Function

char* strcpy(s, ct);
char* strncpy(s, ct, n);

char* strcat(s, ct);
char* strncat(s, ct, n);

The strcpy function copy string ct to s, including the tailing 0. Furthermore, strncpy function copy exactly n characters, padding with \0 if ct has fewer than n characters.

The strcat function concatenate string ct to the end of string s.

# String Comparison

int strcmp(cs, ct);
int strncmp(cs, ct, n);

strcmp function compares the string in lexicographical order, returns <0 if cs<ct. strncmp compares at most n characters.

# String Searching

char* strchr(cs, c);
char* strrchr(cs, c);
char* strspn(cs, ct);
char* strcspn(cs, ct);
char* strpbrk(cs, ct);
char*