String as Character Array

In C++, we can treat text (std::string) as an array of characters. Each character in the text has its own index, which allows us to access individual characters similarly to elements in a vector.

Let's look at an example:

std::string text = "Programming";

In this example, the string text consists of eleven characters. If we want to access the first character of the string, we have two options:

// Using square brackets
char firstChar = text[0];
std::cout << firstChar;  // Output: 'P'

// Or using the at() method
char firstCharAt = text.at(0);
std::cout << firstCharAt;  // Output: 'P'

Similarly, we can access other characters:

char secondChar = text[1];
std::cout << secondChar;  // Output: 'r'

char thirdChar = text.at(2);
std::cout << thirdChar;  // Output: 'o'

The at() method is safer than square brackets because it checks whether the index is not out of range of the string.