how to set all the spaces in a string to @ or any other character

Answer 1

Set all the spaces in a string to @, visit:
https://code.sololearn.com/cj9oWmRA82Jj/?ref=app

Answer 2

create a for loop. Example below.

#include <iostream>
#include <string>

using namespace std;

int main()
{
string password = "helloworld";

for(unsigned int i = 0; i < password.length(); i++)
{
password[i] = '@';
}

return 0;
}