Convert a sentence into its equivalent mobile numeric keypad sequence

Given a sentence in the form of a string, convert it into its equivalent mobile numeric keypad sequence.

Mobile-keypad

Examples :

Input : GEEKSFORGEEKS
Output : 4333355777733366677743333557777
For obtaining a number, we need to press a
number corresponding to that character for 
number of times equal to position of the 
character. For example, for character C, 
we press number 2 three times and accordingly.

Input : HELLO WORLD
Output : 4433555555666096667775553

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

Follow the steps given below to convert a sentence into its equivalent mobile numeric keypad sequence.

For each character, store the sequence which should be obtained at its respective position in an array, i.e. for Z, store 9999. For Y, store 999. For K, store 55 and so on.
For each character, subtract ASCII value of ‘A’ and obtain the position in the array pointed
by that character and add the sequence stored in that array to a string.
If the character is a space, store 0
Print the overall sequence.

Below is the implementation of above method :

C++

// C++ implementation to convert a 
// sentence into its equivalent 
// mobile numeric keypad sequence 
#include <bits/stdc++.h> 
using namespace std; 
  
// Function which computes the sequence 
string printSequence(string arr[], 
                       string input) 
{ 
    string output = ""; 
  
    // length of input string 
    int n = input.length(); 
    for (int i=0; i<n; i++) 
    { 
        // Checking for space 
        if (input[i] == ' ') 
            output = output + "0"; 
  
        else
        { 
            // Calculating index for each  
            // character 
            int position = input[i]-'A'; 
            output = output + arr[position]; 
        } 
    } 
  
    // Output sequence 
    return output; 
} 
  
// Driver function 
int main() 
{ 
    // storing the sequence in array 
    string str[] = {"2","22","222", 
                    "3","33","333", 
                    "4","44","444", 
                    "5","55","555", 
                    "6","66","666", 
                    "7","77","777","7777", 
                    "8","88","888", 
                    "9","99","999","9999"
                   }; 
  
    string input = "GEEKSFORGEEKS"; 
    cout << printSequence(str, input); 
    return 0; 
} 

Java

// Java implementation to convert a 
// sentence into its equivalent 
// mobile numeric keypad sequence 
import java.util.*; 
  
class GFG 
{ 
  
    // Function which computes the sequence 
    static String printSequence(String arr[], 
                               String input) 
    { 
        String output = ""; 
      
        // length of input string 
        int n = input.length(); 
        for (int i = 0; i < n; i++) 
        { 
            // Checking for space 
            if (input.charAt(i) == ' ') 
                output = output + "0"; 
      
            else
            { 
                // Calculating index for each  
                // character 
                int position = input.charAt(i) - 'A'; 
                output = output + arr[position]; 
            } 
        } 
      
        // Output sequence 
        return output; 
    } 
      
    // Driver Function 
    public static void main(String[] args) 
    { 
        // storing the sequence in array 
        String str[] = {"2","22","222", 
                        "3","33","333", 
                        "4","44","444", 
                        "5","55","555", 
                        "6","66","666", 
                        "7","77","777","7777", 
                        "8","88","888", 
                        "9","99","999","9999"
                    }; 
  
        String input = "GEEKSFORGEEKS"; 
        System.out.println(printSequence(str, input)); 
    } 
} 
  
// This code is contributed by Gitanjali. 

Python3

# Python3 implementation to convert 
# a sentence into its equivalent 
# mobile numeric keypad sequence 
  
# Function which computes the  
# sequence 
def printSequence(arr, input): 
  
# length of input string 
    n = len(input) 
    output = "" 
      
    for i in range(n): 
      
        # checking for space 
        if(input[i] == ' '): 
            output = output + "0"
        else: 
            # calculating index for each 
            # character          
            position = ord(input[i]) - ord('A') 
            output = output + arr[position] 
    # output sequence      
    return output 
      
# Driver code 
str = ["2", "22", "222", 
       "3", "33", "333", 
       "4", "44", "444", 
       "5", "55", "555", 
       "6", "66", "666", 
       "7", "77", "777", "7777", 
       "8", "88", "888", 
       "9", "99", "999", "9999" ] 
  
input = "GEEKSFORGEEKS"; 
print( printSequence(str, input)) 
  
# This code is contributed by upendra bartwal 

C#

// C# implementation to convert a 
// sentence into its equivalent 
// mobile numeric keypad sequence 
using System; 
  
class GFG 
{ 
  
    // Function which computes the sequence 
    static String printSequence(string []arr, 
                            string input) 
    { 
        string output = ""; 
      
        // length of input string 
        int n = input.Length; 
        for (int i = 0; i < n; i++) 
        { 
            // Checking for space 
            if (input[i] == ' ') 
                output = output + "0"; 
      
            else
            { 
                // Calculating index for each  
                // character 
                int position = input[i] - 'A'; 
                output = output + arr[position]; 
            } 
        } 
      
        // Output sequence 
        return output; 
    } 
      
    // Driver Function 
    public static void Main() 
    { 
        // storing the sequence in array 
        string []str = {"2","22","222", 
                        "3","33","333", 
                        "4","44","444", 
                        "5","55","555", 
                        "6","66","666", 
                        "7","77","777","7777", 
                        "8","88","888", 
                        "9","99","999","9999"
                    }; 
  
        string input = "GEEKSFORGEEKS"; 
        Console.WriteLine(printSequence(str, input)); 
    } 
} 
  
// This code is contributed by vt_m. 

PHP

<?php  
// PHP implementation to convert a 
// sentence into its equivalent 
// mobile numeric keypad sequence 
  
// Function which computes the sequence 
function printSequence(&$arr, $input) 
{ 
    $output = ""; 
  
    // length of input string 
    $n = strlen($input); 
    for ($i = 0; $i < $n; $i++) 
    { 
        // Checking for space 
        if ($input[$i] == ' ') 
            $output = $output + "0"; 
  
        else
        { 
            // Calculating index for each  
            // character 
            $position = ord($input[$i]) - ord('A'); 
            $output = $output . $arr[$position]; 
        } 
    } 
  
    // Output sequence 
    return $output; 
} 
  
// Driver Code 
  
// storing the sequence in array 
$str = array("2","22","222", "3","33","333", 
             "4","44","444", "5","55","555", 
             "6","66","666", "7","77","777","7777", 
             "8","88","888", "9","99","999","9999"); 
  
$input = "GEEKSFORGEEKS"; 
echo printSequence($str, $input); 
  
// This code is contributed by ita_c 
?> 

Output :

4333355777733366677743333557777

Time complexity : O(n)

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My Personal Notes

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

C++

Java

Python3

C#

PHP

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