如何遍历字符串中的所有字符？

const str = "Hello World!";
for(let i = 0; i < str.length; i++) {
    console.log(str.charAt(i));
}

str = "Hello World!"
for char in str:
    print(char)

String str = "Hello World!";
for(int i = 0; i < str.length(); i++) {
    System.out.println(str.charAt(i));
}

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

int main() {
    string str = "Hello World!";
    for(int i = 0; i < str.length(); i++) {
        cout << str[i] << endl;
    }
    return 0;
}