Methods to concatenate string in C/C++ with Examples

There are various ways to concatenate strings. We will discuss each one by one.

Method 1: Using strcat() function.

The strcat() function is defined in “string.h” header file.

Syntax:

char * strcat(char * init, const char * add)

The init and add string should be of character array(char*). This function concatenates the added string to the end of the init string.

Example:

#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    char init[] = "this is init"; 
    char add[] = " added now"; 
  
    // concatenating the string. 
    strcat(init, add); 
  
    cout << init << endl; 
  
    return 0; 
} 

Output:

this is init added now

Method 2: Using append() function.

Syntax:

string& string::append (const string& str)

str: the string to be appended.

Here str is the object of std::string class which is an instantiation of the basic_string class template that uses char (i.e., bytes) as its character type. The append function appends the add(variable) string at the end of the init string.

Example:

#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    string init("this is init"); 
    string add(" added now"); 
  
    // Appending the string. 
    init.append(add); 
  
    cout << init << endl; 
    return 0; 
} 

Output:

this is init added now

Method 3: Using ‘+’ Operator

Syntax:

string new_string = string init + string add;

This is the most easiest method for concatenation of two string.The + operator simply adds the two string and returns a concatenated string.

Example:

#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    string init("this is init"); 
    string add(" added now"); 
  
    // Appending the string. 
    init = init + add; 
  
    cout << init << endl; 
    return 0; 
} 

Output:

this is init added now

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