Example of String Functions in C++

Convert std::string to C String – c_str)_

The below code demonstrate the use of the above specified string functions:

C++

// C++ Code to demostrate various functions available in 
// String class 
  
#include <iostream> 
#include <string> 
  
using namespace std; 
  
int main() 
{ 
    // Creating and initializing strings 
    string greeting = "Hello, World!"; 
    cout << greeting << endl; 
    string name; 
  
    // Input from the user 
    cout << "Enter your name: "; 
    cin >> name; 
    cout << name << endl; 
  
    // String length 
    int length = greeting.length(); 
    cout << length << endl; 
  
    // Accessing characters 
    char firstChar = greeting[0]; 
    char secondChar = greeting.at(1); 
    cout << firstChar << " " << secondChar << endl; 
  
    // Appending and concatenating strings 
    string firstName = "Geek"; 
    string lastName = "Geeks"; 
    string fullName = firstName + " " + lastName; 
    cout << fullName << endl; 
    string base = "Hello"; 
    cout << base << endl; 
    base.append(" World!"); 
    cout << base << endl; 
  
    // String comparison 
    string str1 = "apple"; 
    string str2 = "banana"; 
    if (str1 == str2) { 
        cout << "Strings are equal" << endl; 
    } 
    else { 
        cout << "Strings are not equal" << endl; 
    } 
  
    int result = str1.compare(str2); 
    if (result == 0) { 
        cout << "Strings are equal" << endl; 
    } 
    else if (result < 0) { 
        cout << "str1 comes before str2" << endl; 
    } 
    else { 
        cout << "str1 comes after str2" << endl; 
    } 
  
    // Substrings 
    string text = "Hello, World!"; 
    cout << text << endl; 
    string sub = text.substr(7, 5); 
    cout << sub << endl; 
  
    // Searching 
    string searchIn = "C++ Programming"; 
    size_t position = searchIn.find("Programming"); 
    if (position != string::npos) { 
        cout << "Found at position " << position << endl; 
    } 
    else { 
        cout << "Not found" << endl; 
    } 
  
    // Modifying strings 
    string modify = "I like dogs."; 
    modify.replace(7, 4, "cats"); 
    cout << modify << endl; 
    modify.insert(6, " black"); 
    cout << modify << endl; 
    modify.erase(6, 6); 
    cout << modify << endl; 
  
    // Conversion 
    string str = "C++"; 
    const char* cstr = str.c_str(); 
    cout << cstr << endl; 
  
    return 0; 
}

Output

Hello, World!
Enter your name: Geeks
Geeks
13
H e
Geek Geeks
Hello
Hello World!
Strings are not equal
str1 comes before str2
Hello, World!
World
Found at position 4
I like cats.
I like black cats.
I like cats.
C++

String Functions In C++

A string is referred to as an array of characters. In C++, a stream/sequence of characters is stored in a char array. C++ includes the std::string class that is used to represent strings. It is one of the most fundamental datatypes in C++ and it comes with a huge set of inbuilt functions. In this article, will look at the functions of string computations.

Example of String Functions in C++

C++

String Functions In C++

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