Program to find the initials of a name.

Difficulty Level : Basic
Last Updated : 09 Nov, 2020

Given a string name, we have to find the initials of the name

Examples:

Input  : prabhat kumar singh
Output : P K S
We take the first letter of all
words and print in capital letter.

Input  : Jude Law
Output : J L

Input  : abhishek kumar singh
Output : A K S

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

1) Print first character in capital.
2) Traverse rest of the string and print every character after space in capital letter.

C++

// C++ program to print initials of a name
#include <bits/stdc++.h>
using namespace std;
  
void printInitials(const string& name)
{
    if (name.length() == 0)
        return;
  
    // Since touuper() returns int, we do typecasting
    cout << (char)toupper(name[0]);
  
    // Traverse rest of the string and print the
    // characters after spaces.
    for (int i = 1; i < name.length() - 1; i++)
        if (name[i] == ' ')
            cout << " " << (char)toupper(name[i + 1]);
}
  
// Driver code
int main()
{
    string name = "prabhat kumar singh";
    printInitials(name);
    return 0;
}

Java

// Java program to print initials of a name
class initials {
      
    static void printInitials(String name)
    {
        if (name.length() == 0)
            return;
  
        // Since touuper() returns int, 
        // we do typecasting
        System.out.print(Character.toUpperCase(
            name.charAt(0)));
  
        // Traverse rest of the string and 
        // print the characters after spaces.
        for (int i = 1; i < name.length() - 1; i++)
            if (name.charAt(i) == ' ')
                System.out.print(" " + Character.toUpperCase(
                                        name.charAt(i + 1)));
    }
  
    // Driver code
    public static void main(String args[])
    {
        String name = "prabhat kumar singh";
        printInitials(name);
    }
}
  
// This code is contributed by Danish Kaleem

Python

# Python program to print 
# initials of a name
  
# user define function 
def printInitials(name): 
    if(len(name) == 0):
        return
    print(name[0].upper()),
    for i in range(1, len(name) - 1):
        if (name[i] == ' '):
            print (name[i + 1].upper()),
  
def main():
    name = "Prabhat Kumar Singh"
    printInitials(name)
  
if __name__=="__main__":
    main() 
  
# This code is contributed
# by prabhat kumar singh 

C#

// C# program to print initials of a name
using System;
  
class initials {
      
    static void printInitials(String name)
    {
        if (name.Length == 0)
            return;
  
        // Since touuper() returns int,
        // we do typecasting
        Console.Write(Char.ToUpper(name[0]));
  
        // Traverse rest of the string and 
        // print the characters after spaces.
        for (int i = 1; i < name.Length - 1; i++)
            if (name[i] == ' ')
                Console.Write(" " + Char.ToUpper(name[i + 1]));
    }
  
    // Driver code
    public static void Main()
    {
        String name = "prabhat kumar singh";
        printInitials(name);
    }
}
  
// This code is contributed by nitin mittal.

PHP

<?php
// php program to print initials of a name
  
function printInitials($name)
{
    if (strlen($name) == 0)
        return;
  
    // Since touuper() returns int, we do typecasting
    echo strtoupper($name[0]);
  
    // Traverse rest of the string and print the
    // characters after spaces.
    for ($i = 1; $i < strlen($name) - 1; $i++)
        if ($name[$i] == ' ')
            echo " " . strtoupper($name[$i + 1]);
}
  
// Driver code
$name = "prabhat kumar singh";
printInitials($name);
  
// This code is contributed by Sam007
?>

Output:

P K S

Another possible solution is given as follows:

Java

// Java program to print initials of a name
class initials {
      
    static void printInitials(String name)
    {
        if (name.length() == 0)
            return;
  
        //split the string using 'space' 
        //and print the first character of every word
        String words[] = name.split(" ");
        for(String word : words) {
            System.out.print(Character.toUpperCase(word.charAt(0)) + " ");
        }
    }
  
    // Driver code
    public static void main(String args[])
    {
        String name = "prabhat kumar singh";
        printInitials(name);
    }
}

Output:

P K S

The complexity of this code will be less than O(w) where w is number of words in sentence, which can be little better than number of characters in String.
This code is contributed by Anuj Khasgiwala

We can also use strtok() function in C/C++ to achieve this.

This article is contributed by Prabhat kumar singh. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.