如何将变量中的字符替换为另一个字符

variable = "Hello, World!"
new_variable = variable.replace("o", "a")
print(new_variable)

String variable = "Hello, World!";
String newVariable = variable.replace("o", "a");
System.out.println(newVariable);

let variable = "Hello, World!";
let newVariable = variable.replace("o", "a");
console.log(newVariable);

#include <iostream>
#include <string>
using namespace std;

int main() {
    string variable = "Hello, World!";
    size_t found = variable.find("o");
    while (found != string::npos) {
        variable.replace(found, 1, "a");
        found = variable.find("o", found + 1);
    }
    cout << variable << endl;
    return 0;
}