Convert a Sentence into its equivalent mobile numeric keypad sequence in C++

December 28, 2021

Convert Sentence into equivalent mobile numeric keypad sequence 

Today in this article we will be discussing how to Convert Sentence into equivalent mobile numeric keypad sequence in C++.

Lets understand this with the help of example :- 

  • Input:- PREP

  • Output:- 7777337 

Lets take example of “PREP” here to select P we need to press 7 and to select R we need to click 7 “3” times so 777 to select E we need to click 3 two times so 33 and again 7 so the output is 7777337
Convert Sentence into equivalent mobile

Algorithm

For obtaining a number, we need to press the number corresponding to that character for number of times equal to position of the character.

  • For every character store the sequence which is required in order to reach that character like for R you need to Click 7 three times that is 777 for K select 55.
  • Create a function printTheSequence(string arr[] , string input) that will take the sequence of array that we have created and the input string str.
  • For every character subtract the 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 then store 0 to output  
  • Then print the overall sequence.
Convert Sentence into equivalent mobile

C++ Code :-

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

//Function 
string printTheSequence(string arr[],string input)
{
  string output = "";

  //length of the input string
  int len = input.length();
  for (int i=0; i<len; i++)
  {
    //Check for the space
    if(input[i] == ' ')
      output = output + "0";
    else
    {
     //Calculating index for each character
     int position = input[i]-'A';
     output = output + arr[position];
    }
  }

  return output;
 }

//Driver Code
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;
  cout<<"Enter the string :"; 
  cin>>input;
  
  cout<<"Sentence into its equivalent mobile numeric keypad sequence :";  
  cout << printTheSequence(str, input);
 
  return 0;
}

Output:-

Enter the string :PREP
Sentence into its equivalent mobile numeric keypad sequence :7777337
Enter the string :PREPINSTA
Sentence into its equivalent mobile numeric keypad sequence :777733744466777782