c++ replace character in string

C++ Replace Character in String:

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello, world!";
    char oldChar = 'o';
    char newChar = '0';

    for (char& c : str) {
        if (c == oldChar) {
            c = newChar;
        }
    }

    std::cout << str << std::endl;

    return 0;
}

1. Include Necessary Libraries: Include the necessary header files for input/output and string manipulation.
2. Define Main Function: Define the main function as the entry point of the program.
3. Initialize String: Initialize a string variable with the value "Hello, world!".
4. Define Old and New Characters: Define the old character to be replaced and the new character to replace it with.
5. Iterate Through String: Use a for loop to iterate through each character in the string.
6. Check for Old Character: Check if the current character is equal to the old character.
7. Replace Character: If the old character is found, replace it with the new character.
8. Print Modified String: Print the modified string after the character replacement.
9. Return 0: Return 0 to indicate successful program execution.