How to Concatenate Multiple Strings in C++?

In C++, to concatenate multiple strings means we need to combine two or more strings into a single string. In this article, we will learn how to concatenate multiple strings in C++.

Example

Input: 
str1="Hello!"
str2="Geek,"
str3="Happy Coding."

Output:
Hello! Geek, Happy Coding.

Concatenate Multiple Strings in C++

To concatenate multiple strings into a single string in C++, we can use the (+) plus operator that appends the additional string(s) to the original string as a result original string is modified.

C++ Program to Concatenate Multiple Strings

The below example demonstrates the use of std::append() method to concatenate multiple string into one in C++.

// C++ Program to Concatenate Multiple Strings

#include <iostream>
#include <string>
using namespace std;

int main()
{

    // initializing strings to
    string str1 = "Hello";
    string str2 = " Geek!";
    string str3 = " Happy Coding";

    // concatenating multiple string using append()
    string concat_str = str1 + str2 + str3;

    // printing the string after concatenation
    cout << "Concatenated String: " << concat_str << endl;
    return 0;
}

Concatenated String: Hello Geek! Happy Coding

Time Complexity: O(N), where N is the total number of characters in the all the strings.
Space Complexity: O(N)

Note: We can concatenate two C-Style strings using strcat() function.