strings.cpp
// string as array of characters char str[] = "proton"; // or with string class #include <string> string string_str = "proton"; // indexing str[0] // p str[3] // t // built-in operators char(toupper(str[0])) // P char(tolower(str[0])) // p // conditionals isdigit(str[0]); // 0 (false) islower(str[0]); // 1 (true) isupper(str[0]); // 0 (false) // comparisons char first_string[] = "This is a string."; char second_string[] = "This is a string."; char third_string[] = "This is another string."; char empty_string[] = ""; strcmp(first_string, second_string); // 1 (equal) strcmp(first_string, third_String); // -78 (not equal) // length of string strlen(first_string); // 17 // or with string class string_str.size(); // 6 string_str.length(); // 6 // copy string strcpy(empty_string, first_string); // This is a string. // or with string class string empty_str = ""; empty_str = string_str; // proton // concatenate string // NOTE: allocate enought to target string char str_one[255] = "This is a string."; // 17 + 1 bytes char str_two[] = "And this too."; // 13 + 1 bytes strcat(str_one, str_two); // This is a string.And this too. // or with string class empty_str = string_str + " " + "neutron"; // proton neutron // reverse string // NOTE: no built-ins, include algorithm #include <algorithm> reverse(string_str.begin(), string_str.end()); // notorp