// 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