How to change the characters of a string in C++
Onyejiaku Theophilus ChidaluOverview
A string in C++ is used to store text. A string variable contains a collection of characters that are enclosed by double quotes (" ").
How to change the character of a string
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
[].
Example
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.
Code
Let’s take a look at the code.
#include <iostream>
#include <string>
using namespace std;
int main() {
// creation a string
string mystring = "Hello";
// to change the 0 index (i.e H) of the string to T
mystring[0] = 'T';
cout << mystring;
return 0;
}
Explanation
- In line 7, we create a string variable
mystring. - In line 10, we change the character at index
0of the string toT. - In line 11, we print the modified string, which we changed from
HellotoTello.
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