A string in C++ is used to store text. A string variable contains a collection of characters that are enclosed by double quotes (" ").
To change a specific character in a string to another value, we refer to the index number position of the character in the string and use single quotation marks (' ').
To access a character of a string in C++, we simply specify the index position of the character in the string in square brackets
[].
For instance, given a string Hello, the first character of the string is H and its corresponding index number or position is 0. The second character e has 1 as its index number.
Therefore, if we create a string variable — let’s call it mystring = Hello — and we want to change the first character (the 0 index) from “H” to “T”, we would simply key the following command into our code:
mystring[0] = 'T'
In the code above, we tell C++ that we want to change the first character of our string to T.
Let’s take a look at the code.
#include <iostream>#include <string>using namespace std;int main() {// creation a stringstring mystring = "Hello";// to change the 0 index (i.e H) of the string to Tmystring[0] = 'T';cout << mystring;return 0;}
mystring.0 of the string to T.Hello to Tello.