APPEND()

This member of the std::string class allows the addition of characters or another string to the end of an existing string. It is similar to using the += operator, but it provides more flexibility through multiple overloads. For example, you can append an entire string, a substring, a single character, or a specified number of characters from a C-style character array. Each call modifies the original string by extending its length to include the new content. It is commonly used when building or concatenating strings in a step-by-step manner.

string1.append(string2);

#include <iostream>            // For input and output
#include <string>
using namespace std;

int main() 
{
  string str1 = "Hello, ";   // First string
  string str2 = "World!";    // Second string
  str1.append(str2);         // Append str2 to str1
  cout << str1 << endl;      // Print the final result
  return 0;                  // End of program
}