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c++c++17stdstring

Why do i can't add an string to an letter of another string?

Consider the following code:

#include <iostream>
#include <typeinfo>

int main(){
    std::string word = "This is string";
    std::string word1 = "a" + word[0];
    std::cout << word1;
}

As you can see, i heve a string with the name word and i want to add first letter of it to another string and store them to string word1. when i run code, I expect that output is aT, but the output is  ╨≥ ╨≥ ╨≥ ╨≥ P≥ ►≥ @≥ ╕♠≥ ! What does this mean? How do i fix it? (Also note that my IDE is Code::Blocks 20.03)

Solution

  • "a" is not a string (well, its a c-string, but not a std::string, and a c-string is just an array). Its a const char[2] and decays to a pointer when + is applied. There is an operator+ for std::string though:

    std::string word1 = std::string("a") + word[0];

    or

    std::string word1 = "a"s + word[0];