C++ program Integer to English conversion

Write a program that takes an integer and displays the English name of that value.

Examples:

10 -> ten
121 -> one hundred twenty one
1032 -> one thousand thirty two
11043 -> eleven thousand forty three
1200000 -> one million two hundred thousand

Solution:


#include <iostream>
using namespace std;

void sperate_digits(int [], int);
void speak(int);
void speak_digit(int);
int i = 0;

int main()
{
cout << "Number: "; int num; cin >> num;

//seperating digits.
int digit[10];
sperate_digits(digit, num);

for ( ; i>0; i--)
{
if (i == 1 || i == 3)
speak_digit(digit[i-1]);
else if (i==2)
speak(digit[i-1]);
else
if (i%2 == 0)//i is the number of digits of number entered by user
{
speak_digit(digit[i-1]);
}
else if(i%2 == 1)
speak(digit[i-1]);

if (i==3 || i%2 == 0) //odd.
switch(i)
{
case 3:
cout << " hundred";
break;
case 4:
case 5:
cout << " thousand";
break;

case 6:
case 7:
cout << " Lac";
break;
case 8:
case 9:
cout << "Arab";
break;
}
cout << ' '; //space.
}
return 0;
}

void sperate_digits(int digit[], int num)
{
for ( ; num != 0; i++)
{
digit[i] = num%10;
num /= 10;
}
}

void speak(int x)
{
switch(x)
{
case 2:
cout << "twenty";
break;
case 3:
cout << "thirty";
break;
case 4:
cout << "forty";
break;
case 5:
cout << "fifty";
break;
case 6:
cout << "sixty";
break;
case 7:
cout << "seventy";
break;
case 8:
cout << "eighty";
break;
case 9:
cout << "ninety";
break;
}
cout << ' '; //space
}

void speak_digit(int x)
{
switch(x)
{
case 1:
cout << "One";
break;
case 2:
cout << "Two";
break;
case 3:
cout << "Three";
break;
case 4:
cout << "Four";
break;
case 5:
cout << "Five";
break;
case 6:
cout << "Six";
break;
case 7:
cout << "Seven";
break;
case 8:
cout << "Eight";
break;
case 9:
cout << "Nine";
break;
}
cout << ' '; //space.
}


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