Show description

P = strchr(emailaddr, '@'); if(p) cout << "Site name of e-mail address is: " << p+1 << endl; // Search for any of a set of characters. In this case, // find the first @ or period. com Found @ Options and Alternatives In addition to the search functions used by this recipe, there are several others supported by C++. Two that are especially helpful in some cases are strspn( ) and strcspn( ). They are shown here: size_t strspn(const char *str1, const char *str2) size_t strcspn(const char *str1, const char *str2) The strspn( ) function returns the index of the first character in the string pointed to by str1 that does not match any of the characters in the string pointed to by str2.

In all cases, you must ensure that the array pointed to by target is large enough to hold the characters pointed to by source. If you don't, the copy will overwrite the end of the target array. This will corrupt your program and is one way that the notorious "buffer overrun attack" can be generated. The function returns target. To concatenate one null-terminated string to the end of another, call strcat( ): char *strcat(char *str1, const char *str2) 17 18 Herb Schildt's C++ Programming Cookbook This function copies the characters in the string pointed to by str2 to the end of the string pointed to by str1.

To copy one string to another, call strcpy( ). 4. To concatenate one string to the end of another, call strcat( ). 5. To compare two strings, call strcmp( ). Discussion The functions that support null-terminated strings are declared in the header . Thus, a program that uses these (or the other functions that operate on null-terminated strings) must include this header. To obtain the length of a null-terminated string, call strlen( ), shown here: size_t strlen(const char *str) It returns the number of characters in the string pointed to by str.