Extracting digits

[alex067]

I have a homework assignment where I have to read an integer below 1000 and output the integer in terms of string

EX:
Enter a number <1000: INPUT: 405
You entered Four Hundred and Five

I have a problem outputting the words after the hundred section, the integer slot c and b are not out putting the correct words.

EX:
Enter a number <1000: INPUT: 405
You entered Four Hundred Ten

#include <iostream>
#include <string>
#include <ctime>

using namespace std; 
const int size = 1000; 

int main()
{
	time_t p;
	time(&p);

	cout << ctime(&p) << endl;

	int num;

	int a, b, c;

	cout << "Enter a number <1000: " << endl;
	cin >> num;

	if (num >= 1 && num <= 999)

	{
		a = num % 10;
		num /= 10;
		b = num % 10;
		num /= 10;
		c = num % 10;
		num /= 10;

	}

	else
	{

		cout << "You have entered an invalid output!";
		exit(1);
	}
	cout << "You entered ";
	switch (c)
	{

	case(1) : cout << "One Hundred "; break;
	case(2) : cout << "Two Hundred "; break;
	case(3) : cout << "Three Hundred ";  break;
	case(4) : cout << "Four Hundred "; break;
	case(5) : cout << "Five Hundred "; break;
	case(6) : cout << "Six Hundred "; break; 
	case(7) : cout << "Seven Hundred "; break;
	case(8) : cout << "Eight Hundred "; break;
	case(9) : cout << "Nine Hundred "; break;
	
	}

	switch (b)
	{
	case(0) : if (a == 0)
	{
				  cout << "Ten.";
	}
			  else
				  cout << "";
			  break;

	case(1) : if (a == 1)
	{
				  cout << "Eleven.";

	}
			  else if (a == 2)
			  {
				  cout << "Tweleve.";
			  }
			  else if (a == 3)
			  {
				  cout << "Thirteen.";
			  }
			  else if (a == 3)
			  {
				  cout << "Fourteen.";
			  }
			  else if (a == 3)
			  {
				  cout << "Fifteen.";
			  }
			  else if (a == 3)
			  {
				  cout << "Sixteen.";
			  }
			  else if (a == 3)
			  {
				  cout << "Seventeen.";
			  }
			  else if (a == 3)
			  {
				  cout << "Eighteen.";
			  }
			  else if (a == 3)
			  {
				  cout << "Nineteen.";
			  }
		break;
	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;
		break;

	}
	
	switch (a)
{
	case(0) : if (b == 1)
	{
				  cout << ""; 
	}
			  else
			  {
				  cout << "";
			  }

		break;
	case(1) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "One. ";
		break;
	case(2) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "Two. ";
			  break;
	case(3) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "Three. ";
			  break;
	case(4) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "Four. ";
			  break;
	case(5) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "Five. ";
			  break;
	case(6) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "Six. ";
			  break;
	case(7) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "Seven. ";
			  break;
	case(8) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "Eight. ";
			  break;
	case(9) : if (b == 1)
	{
				  cout << "";
	}
			  else if (b == 0)
			  {
				  cout << "";
			  }
			  else
				  cout << "Nine. ";
			  break;
}

	
	system("PAUSE");
	return 0;




}

[keskiverto]

Line 59 says "b==0 and a==0", but prints "Ten".

Think about this:

std::string digits[10] { "", "one", "two", "three" };
std::string teens[10] { "ten", "eleven", "twelve" };
if ( 0 < c ) std::cout << digits[c] << " hundred";
if ( 1 == b ) {
  std::cout << ' ' << teens[a];
}
else {
  // print tens with b

  if ( 0 < a ) std::cout << ' ' << digits[a];
}
std::cout << '\n';

The digits is a lookup table that converts numeric index into text. Your switch statements are similar lookup tables, but which might be easier to get right?

[alex067]

It seems a lot easier using an array, but I have to use switch statements and if else statements.


I still can't get it right, I'm sure my condition statements are correct, if the middle integer = 0, and the last digit equals 0, print out "" which is essentially nothing.

if the middle integer is 1 and the last digit is 0, print out ten.

I can't figure out where I went wrong

[keskiverto]

Can you do this then?

// the hundreds switch

if ( 1==b )
{
  // the teens switch
}
else
{
  // the tens switch

  // the ones switch
}

[alex067]

Yes I can, that seems like such an easy solution, thank you keskiverto!