3rd Sep - How to concatenate two strings in c++

This section will discuss the concatenation of two or more strings in the C++ programming language. The concatenation of the string means the group of characters that combines two more strings to return a concatenated single string. While concatenating the strings, the second string is added at the end of the first string to make a single string.

For example, we have two strings, 'Java' and 'Tpoint', and we want to concatenate to make a single string as Java + Tpoint = JavaTpoint.

Let's discuss the different ways to concatenate the given string in the C++ programming language.

1. Concatenate two strings using for loop
2. Concatenate two strings using while loop
3. Concatenate two strings using the + operator
4. Concatenate two strings using the strcat() function
5. Concatenate two strings using the append() function
6. Concatenate two strings using inheritance
7. Concatenate two strings using friend function and strcat() function

Program to concatenate two strings using for loop

Let's consider an example to combine two strings using for loop in the C++ programming.

Program.cpp

#include <iostream> using namespace std; int main () { string str1, str2, result; // declare string variables int i; cout <<" Enter the first string: "; cin >> str1; // take string cout << " Enter the second string: "; cin >> str2; // take second string // use for loop to enter the characters of the str1 into result string for ( i = 0; i < str1.size(); i++) { result = result + str1[i]; // add character of the str1 into result } // use for loop to enter the characters of the str2 into result string for ( i = 0; i < str2.size(); i++) { result = result + str2[i]; // add character of the str2 into result } cout << " The Concatenation of the string " << str1 << " and " << str2 << " is " <<result; return 0; }

Output

  Enter the first string: Java
  Enter the second string: Tpoint
 The Concatenation of the string Java and Tpoint is JavaTpoint

Program to concatenate two strings using while loop

Let's consider an example to combine two strings using a while loop in C++ programming.

Program2.cpp

#include <iostream> using namespace std; int main () { // declare and initialize the string char str1[100] = " We Love"; char str2[100] = " C++ Programming Language"; int i, j; // declare variable cout << " The first string is: " << str1 << endl; cout << " The second string is: "<< str2 <<endl; for (i = 0; str1[i] != '\0'; i++); j = 0; // initialize j with 0; // use while loop that insert the str2 characters in str1 while (str2[j] != '\0') // check str2 is not equal to null { str1[i] = str2[j]; // assign the character of str2 to str1 i++; j++; } str1[i] = '\0'; cout << " The concatenated string is: " << str1; return 0; }

Output

The first string is:  We Love
 The second string is:  C++ Programming Language
 The concatenated string is:  We Love C++ Programming Language

Program to concatenate two strings using the + operator in C++

+ Operator: It is an arithmetic '+'operator that simply adds two strings to return a new concatenated string.

Let's consider an example to combine two strings using the + operator in C++ programming.

Program3.cpp

#include <iostream> using namespace std; int main () { string str1, str2; // declare string variables cout << " Enter the first string: "; cin >> str1; cout << "\n Enter the second string: "; cin >> str2; // use '+' operator to concatenate the str1 and str2 string result = str1 + str2; cout << " The concatenated string " << str1 << " and " << str2 <<" is: " << result; return 0; }

Output

Enter the first string: Java
 Enter the second string: Tpoint
 The concatenated string Java and Tpoint is: JavaTpoint

Program to concatenate two strings using the strcat() method

strcat() function: The strcat is an inbuilt function of the string class, which adds two character strings to return a concatenated string.

Syntax

strcat ( char *arr1, char *arr2)

There are two character arrays in the above syntax, arr1 and arr2, which passed inside the strcat() function to return a concatenated string.

Let's consider an example to combine two strings using strcat() function in the C++ programming.

Program4.cpp

#include <bits/stdc++.h> #include <string> using namespace std; int main() { // declare and initialize the string char str1[] = " We love"; char str2[] = " C++ Programming"; cout << " String 1: " <<str1 <<endl; cout << " String 2: " <<str2 <<endl; // use the strcat() function to concatenate the string strcat(str1, str2); cout << " The concatenated string is: " <<str1; return 0; }

Output

String 1:  We love
String 2: C++ Programming
 The concatenated string is:  We love C++ Programming

Program to concatenate two strings using the append function

append() function: An append() function is a predefined library function used to insert or add a second string at the end of the first string to return a single string.

Syntax

str1.append(str2);

In the above syntax, the str2 is a second string to pass in the append() function that inserts the str2 string at the end of the str1 string.

Let's consider an example to combine two strings using append() function in the C++ programming.

Program5.cpp

#include <iostream> using namespace std; int main () { string str1, str2, result; // declare string variables cout <<" Enter the first string: "; cin >> str1; // take string cout << " Enter the second string: "; cin >> str2; // take second string // use append() function to insert element at the end of the str1 str1.append(str2); cout << " \n The concatenation of the string is: "<< str1; return 0; }

Output

  Enter the first string: Hello
  Enter the second string: Friends!

 The concatenation of the string is: HelloFriends!

Program to concatenate two string using the inheritance of the class

Let's consider an example to combine two strings using inheritance in the C++ programming.

Program6.cpp

#include <iostream> #include <string> using namespace std; // create base class class base { protected: virtual string concatenate(string &str1, string &str2) = 0; }; // create derive class to acquire features of base class class derive: protected base { public: string concatenate (string &str1, string &str2) { string temp; temp = str1 + str2; return temp; } }; int main() { // declare variable string str1, str2; cout <<" Enter first string: "; cin >>str1; cout <<" \n Enter second string: "; cin >>str2; // create string object derive obj; // print string cout <<" \n The concatenated string is: " << obj.concatenate (str1, str2); return 0; }

Output

Enter first string: C++

 Enter second string: Programming

 The concatenated string is: C++Programming

Program to concatenate two strings using the friend function and strcat() function

Let's consider an example to combine two strings using friend function and strcat() function in the C++ programming.

Program7.cpp

#include <iostream> #include <cstring> using namespace std; class Base { private: char st[100], st2[100]; public: void inp() { cout <<" Enter the first string: "; cin.getline (st, 100); // take a line of string with limit 100 cout <<" Enter the second string: "; cin.getline (st2, 100); // take a line of string with limit 100 friend void myfun(Base b); }; void myfun (Base b) { strcat (b.st, b.st2); // pass parameter to concatenate cout <<" The concatenated string: " <<b.st; } int main() { Base b; // create b as an object b.inp(); // b object call inp() function myfun(b); // pass b object to myfun() to print the concatenated string return 0; }

Output

Enter the first string: javatpoint
 Enter the second string: .com
 The concatenated string: javatpoint.com

---

Adblock test (Why?)

You may be interested in:
>> Is a Chromebook worth replacing a Windows laptop?
>> Find out in detail the outstanding features of Google Pixel 4a
>> Top 7 best earbuds you should not miss

Related Posts:
>> Recognizing 12 Basic Body Shapes To Choose Better Clothes
>>Ranking the 10 most used smart technology devices
>> Top 5+ Best E-readers: Compact & Convenient Pen