CPP

append string cpp

// CPP code to demonstrate append(str)
   
#include <iostream>
#include <string>
using namespace std;
   
// Function to demonstrate append()
void appendDemo(string str1, string str2)
{
    // Appends str2 in str1
    str1.append(str2);
    cout << "Using append() : ";
    cout << str1 << endl;
}
   
// Driver code
int main()
{
    string str1("Hello World! ");
    string str2("GeeksforGeeks");
   
    cout << "Original String : " << str1 << endl;
    appendDemo(str1, str2);
   
    return 0;
}

append string to another string c++

// appending to string
#include <iostream>
#include <string>

int main ()
{
  // easy way
  std::string str = "Hello";
  std::string str2 = " World";
  std::cout << str + str2 << std::endl;
  return 0;
}

String Appending in C++

#include <sstream>
// ...

std::stringstream ss;

//put arbitrary formatted data into the stream
ss << 4.5 << ", " << 4 << " whatever";

//convert the stream buffer into a string
std::string str = ss.str();