C++ Program to Print the First Letter of Each Word of a String

// C++ program to find the string 
// which contain the first character 
// of each word of another string.
#include<bits/stdc++.h>
using namespace std;

// Function to find string which has 
// first character of each word.
string firstLetterWord(string str)
{
    string result = "";

    // Traverse the string.
    bool v = true;
    for (int i = 0; i < str.length(); i++)
    {
        // If it is space, set v as true.
        if (str[i] == ' ')
            v = true;

        // Else check if v is true or not.
        // If true, copy character in output
        // string and set v as false.
        else if (str[i] != ' ' && v == true)
        {
            result.push_back(str[i]);
            v = false;
        }
    }

    return result;
}

// Driver code
int main()
{
    string str = "geeks for geeks";
    cout << firstLetterWord(str);
    return 0;
}

// C++ implementation of the above 
// approach
#include <bits/stdc++.h>
using namespace std;

string processWords(char *input)
{
    /* We are splitting the input based on 
       spaces (s)+ : this regular expression 
       will handle scenarios where we have words 
       separated by multiple spaces */
    char *p;
    vector<string> s;

    p = strtok(input, " ");
    while (p != NULL)
    {
        s.push_back(p);
        p = strtok(NULL, " ");
    }

    string charBuffer;

    for (string values : s)

        /* charAt(0) will pick only the 
           first character from the string 
           and append to buffer */
        charBuffer += values[0];

    return charBuffer;
}

// Driver code
int main()
{
    char input[] = "geeks for geeks";
    cout << processWords(input);
    return 0;
}

#include<bits/stdc++.h>
using namespace std;

// Function to find string which has first character of each word.
string firstLetterWord(string str, int index, string result)
{
    // base case: if index is out of range, return the modified string
    if (index == str.length())
        return result;

    // check for space

    if (str[index] == ' ')
    {
        // copy the character to result string
        result.push_back(str[index+1]);
    }
        // recursively call the function for the next index
        return firstLetterWord(str, index + 1, result);
    
}

// Driver code
int main()
{
    string str = "geeks for geeks"; 
   cout<< firstLetterWord(str, 0, "g");
    return 0;
}

//This code is contributed by Vinay Pinjala.