字符串的用法 别忘了

#include <iostream>
#include <string>

using namespace std;
int main(){
    char a[] = "aaaa";
    char b[] = "bbbb";
    cout<< a<<b<<endl;
    string c = "cccccc";

    c.append("+");
    cout<<c<<endl;
    cout<<c[6];
}