Accessing characters by index in a string.

Inserting Character/String into an String.

To access any character in a String, we need:

A non-empty string (say “str”)
A position/index of the character from where it is to be accessed. (say “k”)

Using these two, the character can be easily accessed using the below syntax:

char ch = str[k];
OR
char ch = str.charAt(k);

Below is the implementation of the above approach:

C++

// CPP code for accessing an element by index

#include <iostream>
#include <string>

using namespace std;

// Function to demonstrate insert
char accessCharByIndex(string str, int k)
{

    // return the character at Kth index
    // in the string str
    return str[k];
}

// Driver code
int main()
{
    string str("w3wiki ");
    int k = 4;
    cout << accessCharByIndex(str, k) << endl;

    return 0;
}

#include <stdio.h>
#include <string.h>

// Function to demonstrate accessing character by index
char accessCharByIndex(char* str, int k)
{
    // Return the character at the kth index in the string
    return str[k];
}

// Driver code
int main()
{
    char str[] = "w3wiki ";
    int k = 4;
    printf("%c\n", accessCharByIndex(str, k));

    return 0;
}

Java

public class GFG {
  
    // Function to demonstrate accessCharByIndex
    public static char accessCharByIndex(String str, int k) {
      
        // Return the character at the k-th index in the string str
        return str.charAt(k);
    }

    // Driver code
    public static void main(String[] args) {
        String str = "w3wiki ";
        int k = 4;
        System.out.println(accessCharByIndex(str, k));
    }
}

Python

# Function to access an element by index
def access_char_by_index(s, k):
  
    # Return the character at the kth index in the string s
    return s[k]

# Driver code


def main():
    string_value = "w3wiki "
    index = 4
    print(access_char_by_index(string_value, index))


# Run the main function
if __name__ == "__main__":
    main()

using System;

class Program {
  
    // Function to access a character by index
    static char AccessCharByIndex(string str, int k)
    {
      
        // Return the character at the k-th index
        return str[k];
    }

    static void Main()
    {
        string str = "w3wiki ";
        int k = 4;
        Console.WriteLine(AccessCharByIndex(str, k));
    }
}

JavaScript

// Function to demonstrate access by index
function accessCharByIndex(str, k) {
    // Return the character at the kth index in the string str
    return str[k];
}

// Driver code
let str = "w3wiki ";
let k = 4;
console.log(accessCharByIndex(str, k));

Output

Basic String Operations with Implementation

In this post, we will look into some of the basic String operations such as:

Accessing characters by index in a string.
Inserting character into a String.
Modifying character in String
Deletion of Character in String
Concatenating strings (combining multiple strings into one).
Finding the length of a string
Comparing strings for equality or lexicographical order

Let us consider the basic String operations one by one.

Tags:

#DSA #Strings #Strings

Inserting Character/String into an String.

Accessing characters by index in a string.

Basic String Operations with Implementation

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