In this program, you will learn a C++ program to concatenate two strings. In C++ programming string concatenation is the process of joining two or more strings to form a new resultant string. Here we discuss three different approaches to joining strings.
1: Using the “+” operator
2: Using strcat () function
3: Using the append function
Let’s Discuss one by one
1: Using the “+” operator
In c++ this is the easiest way to concatenate two strings. This program takes two strings from the user and concatenates them using the “+” operator and displays the resultant string on the console screen.
#include <iostream>
#include <string>
using namespace std;
int main () {
string string1 = "Hello ";
string string2 = "World";
string result = string1 + string2;
cout << result;
return 0;
}
Output
Hello World2: Using strcat () function
The strcat function joins two strings in C++. It is found in the string library. Let’s check the C++ program below.
#include <iostream>
#include <string.h>
using namespace std;
int main () {
char string1[100] = "Hello ";
char string2[100] = "World";
strcat (string1,string2);
cout << string1;
return 0;
}
Output
Hello World3: Using the append function
This is the pre-defined library function. It can also be used to join two strings in C++. Below is the C++ program to concatenate two strings using the append function.
#include <iostream>
#include <string>
using namespace std;
int main () {
string string1 = "Hello ";
string string2 = "World";
string result = string1.append(string2);
cout << result;
return 0;
}
Output
Hello World