C++ Tutorial Index

C++ Tutorial C++ History C++ Installation C++ First Program C++ cin and cout C++ Data type C++ Variable C++ operator C++ Keywords

C++ Control Statements

C++ If C++ Nested if C++ If-else C++ If-else-if C++ Switch C++ Break C++ Continue C++ Goto C++ For loop C++ While loop C++ Do while loop

C++ Functions

C++ Call by Value C++ Call by Reference C++ Recursion Function C++ Inline function C++ Friend function

C++ Arrays

Single dimension array Two dimension array

C++ Strings

C++ Strings

C++ Inheritance

C++ Inheritance Single level Inheritance Multilevel Inheritance Multiple Inheritance Hierarchical Inheritance Hybrid Inheritance

C++ Polymorphism

C++ Polymorphism C++ Overloading C++ Overriding C++ Virtual Function

C++ Pointers

C++ Pointers C++ this pointer

C++ Exception Handling

C++ Exception Handling

C++ Constructors

C++ Constructors Default Constructor Parameterize Constructor Copy constructor Constructor Overloading Destructor

C++ File Handling

C++ File Handling C++ Writing to file C++ Reading file C++ Close file

Miscellaneous

C Vs C++ C++ Comments C++ Data Abstraction C++ Identifier C++ Memory Management C++ Storage Classes C++ Void Pointer C++ Array To Function C++ Expressions C++ Features C++ Interfaces C++ Encapsulation std::min in C++ External merge sort in C++ Remove duplicates from sorted array in C++ Precision of floating point numbers Using these functions floor(), ceil(), trunc(), round() and setprecision() in C++ C++ References C++ Friend Functions C++ Mutable keyword Unary Operators in C++ Initialize Array of objects with parameterized constructors in C++ Differences between #define & const in C/C++ C++ Program to Implement Shell Sort C++ Program to Implement Merge Sort Storage Classes in C Vector resize() in C++ Passing by Reference Vs. Passing by the pointer in C++ Free vs delete() in C++ goto statement in C and C++ C++ program to read string using cin.getline() C++ String Concatenation Heap Sort in C++ Swap numbers in C++ Input Iterators in C++ Fibonacci Series in C++ C ++ Program: Alphabet Triangle and Number Triangle C++ Program: Matrix Multiplication C++ Program to Print Fibonacci Triangle Stack in C++ Maps in C++ Queue in C++ C++ Bitset C++ Algorithms Priority Queue in C++ C++ Multimap C++ Deque Function Pointer in C++ Sizeof() Operators in C++ C++ array of Pointers free() Vs delete in C Timsort Implementation Using C++ CPP Templates C++ Aggregation C++ Enumeration C++ Math Functions C++ Object Class C++ Queue Initialize Vector in C++ Vector in C++ C++ STL Components Function overloading in C++ C++ Maximum Index Problem C++ find missing in the second array C++ Program to find the product array puzzle C++ Program To Find Largest Subarray With 0 Sum C++ Program To Move All Zeros To The End Of The Array C++ Program to find the element that occurs once C++ Program to find the largest number formed from an array Constructor Vs Destructor C++ Namespaces C++ OOPs Concept C++ Static C++ Structs C++ Try-Catch C++ User Defined Exceptions C++ Virtual Destructor C++ vs C# Malloc() and new in C++ Palindrome Number Program in C++ Snake Code in C++ Splitting a string in C++ Structure Vs Class in C++ Virtual Function Vs Pure Virtual Function C++ Bidirectional Iterators C++ Forward Iterators C++ Iterators C++ Output Iterators C++ Range-based For Loop Converting string into integer in C++ LCM Program in C++ Type conversion in C++ Add two numbers using the function in C++ Advantage and disadvantage friend function C++ Armstrong Number Program in C++ ATM machine program in C++ using functions Binary to Decimal in C++ Bit Manipulation in C++ C++ Constructor C++ Dijkstra Algorithm Using the Priority Queue C++ int into String C++ Signal Handling Decimal to Binary in C++ Decimal to Hexadecimal in C++ Decimal to Octal in C++ Factorial Program in C++ Function in C++ Hexadecimal to Decimal in C++ Octal to Decimal in C++ Reverse a Number in C++ Structure Vs Class in C++ C++ Forward Iterators C++ Output Iterators C++ Prime number program Char Array to String in C++ Constructor Overloading in C++ Default arguments in C++ Different Ways to Compare Strings in C++ Dynamic Binding in C++ Program to convert infix to postfix expression in C++ SET Data Structure in C++ Upcasting and Downcasting in C++ Reverse an Array in C++ Fast Input and Output in C++ Delete Operator in C++ Copy elision in C++ C++ Date and Time C++ Bitwise XOR Operator Array of sets in C++ Binary Operator Overloading in C++ Binary Search in C++ Implementing the sets without C++ STL containers Scope Resolution Operator in C++ Smart pointers in C++ Types of polymorphism in C++

C++ String Concatenation

C++ String Concatenation

In this section, we will learn about C ++ String Concatenation, what it does, how it works, and will also see its programs.

What is the String Concatenation?

The + operator can be used to form a new string between strings to link them together. That is known as concatenation.

There are different ways to perform concatenation of strings. We will be discussing each one of them.

Using strcat() function.

The strcat) (function is set to the header file of "string.h."

Syntax:           

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

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

Example:

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

Output:

C++ String Concatenation

Using append() function.

A string in C++ is actually an object that contains functions to perform some string operations. For, e.g., you can also use the function append() to concatenate strings.

Syntax:-

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

Here str is the std::string class object, which is an instantiation of the basic string class template which uses char as a type of its character. At the end of the0 init string, the append function appends the add(variable) string.

In the above example, we added space on output after firstName to create a space between Mike and Johnson. You can, however, also add a space with quotes ("or"):

#include <iostream>
#include <string>
using namespace std;
int main () {
  string firstName = "Mike";
  string lastName = "Johnson";
  string fullName = firstName.append(lastName);
  cout << fullName;
  return 0;
}

Output:

C++ String Concatenation

Whether you want to use + or append() is up to you. The key difference between the two is that the function append() is much quicker. Nonetheless, it may be better to only use + for checking and so on.

Using ‘+’ Operator

Syntax:

string new_string = string init + string add;

It is the simplest way to merge two strings. The + operator actually puts the two strings together and returns a concatenated string.

Example:

#include <bits/stdc++.h>
using namespace std;
int main()
{
    string cha1("Hello,");
    string cha2("my name is mike johnson.");
    string cha3("I am a software developer");
    string cha4(" in Company ");
    string cha5(" from Us");
    string cha6(" As a good developer");
    // Appending the string.
   cha1 = cha1 + cha2 + cha3 + cha4  + cha5 + cha6;
    cout << cha1 << endl;
    return 0;
}

Output:

C++ String Concatenation

Example

#include <iostream>
using namespace std;
int main()
{
    string s1, s2, result;
    cout << "Enter string s1: ";
    getline (cin, s1);
    cout << "Enter string s2: ";
    getline (cin, s2);
    result = s1 + s2;
    cout << "Resultant String = "<< result;
    return 0;
}

Output:

C++ String Concatenation

Without using function

For this, we concatenate two separate strings without using strcat() as the concatenation function.

Example:

#include<iostream>
#include<string.h>
using namespace std;
int main()
{
          //declare strings
          char string1[100];
          char string2[100];
          //input first string
          cout<<"Enter first string : "<<endl;
          cin.getline(string1,100);
          //input second string
          cout<<"Enter second string : "<<endl;
          cin.getline(string2,100);
          //variable as loop counnters
          int k, f;
          //keep first string same
          for(k=0; string1[k] != '\0'; k++)
          {
                   ;
          }
          //copy the characters of string 2 in string1
          for(f=0; string2[f] != '\0'; f++,k++)
          {
                   string1[k]=string2[f];
          }
          //insert NULL
          string1[k]='\0';
          //printing
          cout<<string1<<endl;
          return 0;
}

Output:

C++ String Concatenation



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