c++ Primer exercise 6.8 (switch-statement)

[w3rd]

Hello everyone,

I am trying to learn c++ with the c++ Primer and I do have a problem with exercise 6.8:

"Modify our vowel-count program so that it also counts the number of blank spaces, tabs, and newlines read."
My solution doesnt count them and I dont know why...

This is my code:

#include <iostream>

using std::cin;
using std::cout;
using std::endl;

int main()
{
	int a = 0;
	int e = 0;
	int i = 0;
	int o = 0;
	int u = 0;
	int space = 0;
	int tab = 0;
	int nl = 0;

	char eingabe;
	while (cin >> eingabe)
	{
		switch (eingabe)
		{
			case '\n':
				++nl;
				break;
			case '\t':
				++tab;
				break;
			case ' ':
				++space;
				break;
			case 'a': case 'A':
				++a;
				break;
			case 'e': case 'E':
				++e;
				break;
			case 'i': case 'I':
				++i;
				break;
			case 'o': case 'O':
				++o;
				break;
			case 'u': case 'U':
				++u;
				break;
			default:
				;
		}
	}
	cout << a << " as" << endl; 
	cout << e << " es" << endl; 
	cout << i << " is" << endl; 
	cout << o << " os" << endl; 
	cout << u << " us" << endl; 
	cout << space << " spaces" << endl;
	cout << tab << " tabs" << endl;
	cout << nl << " new lines" << endl;

	return 0;
}

Can someone please tell me what I am doing wrong here?
Thank you!

[Skizmo]

My solution doesnt count them and I dont know why...

What do you see happening when you use the debugger to step through it ?

[w3rd]

thank you. I didnt think of that.
If my input is e.g.

a b c

it ignores the white spaces and checks only for abc. My guess is, it has something to do with char, but I am clueless...

[ZuK]

By default whitespace is ignored by input streams.
But there is the iomanipulator noskipws that will do the trick.

Just #include <iomanip>

and add

    cin >> std::noskipws;

Kurt

[w3rd]

Thank you Kurt! You got me on the right track.
But I wanted to do it by means already covered in the book, so I used getline():

#include <iostream>
#include <string>

using std::string;
using std::cin;
using std::cout;
using std::endl;

int main()
{
	int a = 0;
	int e = 0;
	int i = 0;
	int o = 0;
	int u = 0;
	int space = 0;
	int tab = 0;
	int nl = 0;

	string line;
	while (getline(cin, line))
	{
		for (string::size_type ix = 0; ix != line.size(); ++ix)
		{
			switch (line[ix])
			{
				case '\t':
					++tab;
					break;
				case ' ':
					++space;
					break;
				case 'a': case 'A':
					++a;
					break;
				case 'e': case 'E':
					++e;
					break;
				case 'i': case 'I':
					++i;
					break;
				case 'o': case 'O':
					++o;
					break;
				case 'u': case 'U':
					++u;
					break;
				default:
					;
			}
		}
		++nl;
	}
	cout << a << " as" << endl; 
	cout << e << " es" << endl; 
	cout << i << " is" << endl; 
	cout << o << " os" << endl; 
	cout << u << " us" << endl; 
	cout << space << " spaces" << endl;
	cout << tab << " tabs" << endl;
	cout << nl << " new lines" << endl;

	return 0;
}