C++易错合集 [updating]

string/char

1. string::push_back

error: invalid conversion from ‘const char*’ to ‘char’ [-fpermissive]

#include <iostream>
#include <string>

using namespace std;

int main()
{
    string res;
    // res.push_back("null");           //ERROR push_back takes in char instead of const char*
    
    // correct use of push_back - add char
    res.push_back('L');
    cout<<res<<endl;
    
    // add more than a single char
    res += string("isa");
    res += " is";
    
    res.append(string(" the "));
    res.append("best ");
    
    res.insert(res.end(), 'b');         //iterator only accept char
    res.insert(res.size(), "est!");     //position
    
    cout<<res<<endl;

    return 0;
}

run the above here