Print the first and last character of each word in a String

Given a string, the task is to print the first and last character of each word in a string.
Examples:

Input: Geeks for geeks
Output: Gs fr gs

Input: Computer applications
Output: Cr as

Approach

1. Run a loop from the first letter to the last letter.
2. Print the first and last letter of the string.
3. If there is a space in the string then print the character that lies just before space and just after space.

Below is the implementation of the above approach. 

C++

// CPP program to print
// the first and last character
// of each word in a String
#include<bits/stdc++.h>
using namespace std;

// Function to print the first
// and last character of each word.
void FirstAndLast(string str)
{
    int i;

    for (i = 0; i < str.length(); i++)
    {
        // If it is the first word
        // of the string then print it.
        if (i == 0)
            cout<<str[i];

        // If it is the last word of the string
        // then also print it.
        if (i == str.length() - 1)
            cout<<str[i];

        // If there is a space
        // print the successor and predecessor
        // to space.
        if (str[i] == ' ')
        {
            cout<<str[i-1]<<" "<<str[i+1];
        }
    }
}

// Driver code
int main()
{
    string str = "Geeks for Geeks";
    FirstAndLast(str);
}

// This code is contributed by
// Surendra_Gangwar

Java

// Java program to print
// the first and last character
// of each word in a String

class GFG {

    // Function to print the first
    // and last character of each word.
    static void FirstAndLast(String str)
    {
        int i;

        for (i = 0; i < str.length(); i++) {

            // If it is the first word
            // of the string then print it.
            if (i == 0)
                System.out.print(str.charAt(i));

            // If it is the last word of the string
            // then also print it.
            if (i == str.length() - 1)
                System.out.print(str.charAt(i));

            // If there is a space
            // print the successor and predecessor
            // to space.
            if (str.charAt(i) == ' ') {
                System.out.print(str.charAt(i - 1)
                                 + " "
                                 + str.charAt(i + 1));
            }
        }
    }

    // Driver code
    public static void main(String args[])
    {
        String str = "Geeks for Geeks";
        FirstAndLast(str);
    }
}

Python3

# Python3 program to print
# the first and last character
# of each word in a String'

# Function to print the first
# and last character of each word.
def FirstAndLast(string):
    for i in range(len(string)):

        # If it is the first word
        # of the string then print it.
        if i == 0:
            print(string[i], end = "")

        # If it is the last word of the string
        # then also print it.
        if i == len(string) - 1:
            print(string[i], end = "")

        # If there is a space
        # print the successor and predecessor
        # to space.
        if string[i] == " ":
            print(string[i - 1],
                  string[i + 1], end = "")

# Driver code
if __name__ == "__main__":
    string = "Geeks for Geeks"
    FirstAndLast(string)

# This code is contributed by
# sanjeev2552

C#

// C# program to print
// the first and last character
// of each word in a String
using System;

class GFG
{

    // Function to print the first
    // and last character of each word.
    static void FirstAndLast(string str)
    {
        int i;

        for (i = 0; i < str.Length; i++)
        {

            // If it is the first word
            // of the string then print it.
            if (i == 0)
                Console.Write(str[i]);

            // If it is the last word of the string
            // then also print it.
            if (i == str.Length - 1)
                Console.Write(str[i]);

            // If there is a space
            // print the successor and predecessor
            // to space.
            if (str[i] == ' ')
            {
                Console.Write(str[i - 1]
                                + " "
                                + str[i + 1]);
            }
        }
    }

    // Driver code
    public static void Main()
    {
        string str = "Geeks for Geeks";
        FirstAndLast(str);
    }
}

// This code is contributed by Ryuga

Javascript

<script>

      // JavaScript program to print
      // the first and last character
      // of each word in a String'

      // Function to print the first
      // and last character of each word.
      function FirstAndLast(str)
      {
        for (var i = 0; i < str.length; i++)
        {
          // If it is the first word
          // of the string then print it.
          if (i == 0)
          document.write(str[i]);

          // If it is the last word of the string
          // then also print it.
          if (i == str.length - 1)
          document.write(str[i]);

          // If there is a space
          // print the successor and predecessor
          // to space.
          if (str[i] === " ") {
            document.write(str[i - 1] + " " + str[i + 1]);
          }
        }
      }

      // Driver code
      var str = "Geeks for Geeks";
      FirstAndLast(str);

 </script>

Output:

Gs fr Gs

Time Complexity: O(n) where n is the length of the string

Auxiliary Space: O(1)