numtochar.cpp

#include<iostream>
using namespace std;

void numtochar(int n){
    int mod = n%10;
    string single[] = {"Zero" , "One" , "Two" , "Three" , "Four" , "Five" , "Six" , "Seven" , "Eight" , "Nine" , "Ten"};
    string double_val1[] = {"Eleven" , "Twelve" , "Thirteen" , "Fourteen" , "Fifteen" , "Sixteen" , "Seventeen" , "Eighteen" , "Nineteen"};
    string double_val[] = {"Ten"  , "Twenty" , "Thirty" , "Fourty" , "Fifty" , "Sixty" , "Seventy" , "Eighty" , "Ninety"};
    if(n<=10){
        cout<<single[n];
    }
    else if(n>10 && n<20 && mod>0 && n<100){
        cout<<n<<"=" + double_val1[mod-1];
    }
    else if(mod == 0 && n>=20 && n<100){
        int div = n/10;
        cout<<n<<" = "<<double_val[div-1]<<endl;
    }
    else if(mod > 0 && n>=20 && n<100){
        int div = n/10;
        cout<<n<<" = " <<double_val[div-1] + " " +  single[mod];
    }
    else{
        cout<<"Inavlid input"<<endl;
        cout<<"Enter two digits number only"<<endl;
    }
}

int main()
{
    int n;
    cout<<"Enter number: "<<endl; 
    cin>>n;
    numtochar(n);
    return 0;
}

numtochar.java

import java.util.*;

class NumtoC{
	public void fun_numtochar(int n) {
		int mod = n%10;
	    String single[] = {"Zero" , "One" , "Two" , "Three" , "Four" , "Five" , "Six" , "Seven" , "Eight" , "Nine" ,"ten"};
	    String double_val1[] = {"Eleven" , "Twelve" , "Thirteen" , "Fourteen" , "Fifteen" , "Sixteen" , "Seventeen" , "Eighteen" , "Nineteen"};
	    String double_val[] = {"Ten"  , "Twenty" , "Thirty" , "Fourty" , "Fifty" , "Sixty" , "Seventy" , "Eighty" , "Ninety"};
	    if(n<=10){
	        System.out.println(n + "=" + single[n]);
	    }
	    else if(n>10 && n<20 && mod>0 && n<100){
	        System.out.println(n + " " + double_val1[mod-1]);
	    }
	    else if(mod == 0 && n>=20 && n<100 ){
	        int div = n/10;
	        System.out.println(n + " = "+double_val[div-1]);
	    }
	    else if(mod > 0 && n>=20 && n<100){
	        int div = n/10;
	        System.out.println(n + " = "+double_val[div-1] + " " + single[mod]);
	    }
	    else{
	        System.out.println("Inavlid input");
	    }
	}
}

public class numtochar {

	public static void main(String[] args) {
		int n;
		System.out.println("Enter Number:");
		Scanner input = new Scanner(System.in);
		n = input.nextInt();
		NumtoC number = new NumtoC();
		number.fun_numtochar(n);
	}
}

numtochar_Logic.txt

1st array for single value element that is from one to nine [string array]
    string single[] = {"Zero" , "One" , "Two" , "Three" , "Four" , "Five" , "Six" , "Seven" , "Eight" , "Nine"};
    
2nd array for double value element that is from eleven to nineteen [string array]
    string double_val1[] = {"Eleven" , "Twelve" , "Thirteen" , "Fourteen" , "Fifteen" , "Sixteen" , "Seventeen" , "Eighteen" , "Nineteen"};
    
3rd array for double value element but should have gap of 10 that is ten,twenty,thirty and so on..
    string double_val[] = {"Ten"  , "Twenty" , "Thirty" , "Fourty" , "Fifty" , "Sixty" , "Seventy" , "Eighty" , "Ninety"};

1st **If condition** Logic:
Condition : Whether the number is less than 10
Satisfied : single[n]
Example : Input = 1 || Condition = 1 < 10 (Satisfied) || single[1] which is One || Output: 1 = One

 if(n<10){
        cout<<single[n];
    }

2nd **Else-If condition** Logic:
Condition : Whether number is greater than 10 and lesser than 20
2nd Condition : Whether modulo that is n%10 is greater than 0 
3rd Condition : Number should be less than 100
Satisfied : cout<<n<<"=" + double_val1[mod-1]; 
Example : Input = 14 || All Conditions satisfied
mod = 14%10 = 4   [n%10]
double_val1[mod-1] = [4-1] = [3] which in our case is Fourteen 
Here we subtract - 1 from mod because array index starts with 0

Output : 14 = Fourteen

 else if(n>10 && n<20 && mod>0 && n<100){
        cout<<n<<"=" + double_val1[mod-1];
    }
    
3rd **Else-If condition** Logic:
Condition : Whether mod is equal to 0 
2nd Condition : Whether number is greater than 20 and lesser than 100
Satisfied :  cout<<n<<" = "<<double_val[div-1]<<endl;
Example : Input = 50 || All conditions are satisfied
Mod = 50%10 = 0   [n%10]
div = 50/10 = 5   [n/10]
double_val[div-1] = [5-1 = 4] = Fifty

Output: 50 = Fifty

 else if(mod == 0 && n>=20 && n<100){
        int div = n/10;
        cout<<n<<" = "<<double_val[div-1]<<endl;
    }

4th **Else-If condition** Logic:
Condition : Mod should be greater than 0
2nd condition : Number should be Greater than 20 and less than 100
Satisfied = cout<<n<<" = " <<double_val[div-1] + " " +  single[mod];
Example: Input = 72 || All conditions are satisfied

mod = 72%10 = 2 [n%10]
div = 72/10 = 7 [n/10]
double_val[div-1] + " " +  single[mod] = double_val[7-1 = 6] + single[2] = Seventy + Two = Seventy Two
div-1 because as we know array index starts with 0.

Output : 72 = Seventy Two

else if(mod > 0 && n>=20 && n<100){
        int div = n/10;
        cout<<n<<" = " <<double_val[div-1] + " " +  single[mod];
    }
    
5th **Else** [If no conditions are satisfied that is number is greater than 100 ]
We would show error message "Inavlid input" and ask them to enter two digits number

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