This part will cover the merging of multiple strings in the C++ coding language. String concatenation involves merging two or more strings to produce a unified string. During the concatenation process, the second string is appended to the end of the first one to form a cohesive string.
For instance, consider two strings, ' Python ' and ' Programming ', that we aim to merge to form a combined string: Python + Programming = PythonProgramming.
Let's discuss the different ways to concatenate the given string in the C++ programming language.
- Concatenate two strings using for loop
- Concatenate two strings using while loop
- Concatenate two strings using the + operator
- Concatenate two strings using the strcat function
- Concatenate two strings using the append function
- Concatenate two strings using inheritance
- Concatenate two strings using friend function and strcat function
Program to concatenate two strings using for loop
Let's explore an illustration of merging two strings using a for loop in 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: CppTutorial
The Concatenation of the string Java and CppTutorial is JavaCppTutorial
Program to concatenate two strings using while loop
Let's explore a demonstration of merging two strings by utilizing 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
The ### Program to concatenate two strings using the + operator in C++ operator performs string concatenation by adding two strings together to create a new concatenated string.
Let's explore an illustration where we merge two strings by utilizing 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: CppTutorial
The concatenated string Java and CppTutorial is: JavaCppTutorial
Program to concatenate two strings using the strcat method
The strcat function is a built-in feature of the string class that combines two character strings to produce a single concatenated string.
Syntax
strcat ( char *arr1, char *arr2)
There are two arrays of characters, namely arr1 and arr2, which are provided as arguments to the strcat function in order to produce a combined string.
Let's explore a scenario where we merge two strings by employing the strcat function in 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
The append method is a built-in function that is employed to concatenate a second string at the conclusion of the first string in order to produce a unified string.
Syntax
str1.append(str2);
In the provided syntax, the variable str2 represents a secondary string parameter passed into the append method, which effectively appends the content of str2 to the end of the str1 string.
Let's explore an illustration of merging two strings by employing the append method in 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 explore a demonstration of merging two strings by employing inheritance in 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 explore an illustration demonstrating the merging of two strings by employing a friend function alongside the strcat function within the realm of 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: javacpptutorial
Enter the second string: .com
The concatenated string: cpptutorial.com
